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Press Q or Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class count: < span class = "token number" > 1< / span > , method count: < span class = "token number" > 1< / span > < span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 32< / span > ms, listenerId: < span class = "token number" > 5< / span >
< span class = "token assign-left variable" > method< / span > < span class = "token operator" > =< / span > demo.MathGame.primeFactors < span class = "token assign-left variable" > location< / span > < span class = "token operator" > =< / span > AtExceptionExit
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2021< / span > -08-31 < span class = "token number" > 15< / span > :22:57< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 0< / span > .220625ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Object< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > -179173< span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
@MathGame< span class = "token punctuation" > [< / span >
< span class = "token assign-left variable" > random< / span > < span class = "token operator" > =< / span > @Random< span class = "token punctuation" > [< / span > java.util.Random@31cefde0< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > illegalArgumentCount< / span > < span class = "token operator" > =< / span > @Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 44< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
null,
< span class = "token punctuation" > ]< / span >
< span class = "token assign-left variable" > method< / span > < span class = "token operator" > =< / span > demo.MathGame.primeFactors < span class = "token assign-left variable" > location< / span > < span class = "token operator" > =< / span > AtExit
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2021< / span > -08-31 < span class = "token number" > 15< / span > :22:58< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 1< / span > .020982ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Object< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 1< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
@MathGame< span class = "token punctuation" > [< / span >
< span class = "token assign-left variable" > random< / span > < span class = "token operator" > =< / span > @Random< span class = "token punctuation" > [< / span > java.util.Random@31cefde0< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > illegalArgumentCount< / span > < span class = "token operator" > =< / span > @Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 44< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
@ArrayList< span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 2< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 2< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 26947< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > 上面的结果里，说明函数被执行了两次，第一次结果是< code > location=AtExceptionExit< / code > ，说明函数抛出异常了，因此< code > returnObj< / code > 是 null< / li > < li > 在第二次结果里是< code > location=AtExit< / code > ，说明函数正常返回，因此可以看到< code > returnObj< / code > 结果是一个 ArrayList< / li > < / ul > < h3 id = "指定-class-最大匹配数量" tabindex = "-1" > < a class = "header-anchor" href = "#指定-class-最大匹配数量" aria-hidden = "true" > #< / a > 指定 Class 最大匹配数量< / h3 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ < span class = "token function" > watch< / span > demo.MathGame primeFactors < span class = "token parameter variable" > -m< / span > < span class = "token number" > 1< / span >
Press Q or Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class count: < span class = "token number" > 1< / span > , method count: < span class = "token number" > 1< / span > < span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 302< / span > ms, listenerId: < span class = "token number" > 3< / span >
< span class = "token assign-left variable" > method< / span > < span class = "token operator" > =< / span > demo.MathGame.primeFactors < span class = "token assign-left variable" > location< / span > < span class = "token operator" > =< / span > AtExceptionExit
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2022< / span > -12-25 < span class = "token number" > 19< / span > :58:41< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 0< / span > .222419ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Object< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span > isEmpty< span class = "token operator" > =< / span > false< span class = "token punctuation" > ;< / span > < span class = "token assign-left variable" > size< / span > < span class = "token operator" > =< / span > < span class = "token number" > 1< / span > < span class = "token punctuation" > ]< / span > ,
@MathGame< span class = "token punctuation" > [< / span > demo.MathGame@3bf400< span class = "token punctuation" > ]< / span > ,
null,
< span class = "token punctuation" > ]< / span >
< span class = "token assign-left variable" > method< / span > < span class = "token operator" > =< / span > demo.MathGame.primeFactors < span class = "token assign-left variable" > location< / span > < span class = "token operator" > =< / span > AtExceptionExit
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2022< / span > -12-25 < span class = "token number" > 19< / span > :58:51< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 0< / span > .046928ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Object< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span > isEmpty< span class = "token operator" > =< / span > false< span class = "token punctuation" > ;< / span > < span class = "token assign-left variable" > size< / span > < span class = "token operator" > =< / span > < span class = "token number" > 1< / span > < span class = "token punctuation" > ]< / span > ,
@MathGame< span class = "token punctuation" > [< / span > demo.MathGame@3bf400< span class = "token punctuation" > ]< / span > ,
null,
< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h3 id = "观察函数调用入口的参数和返回值" tabindex = "-1" > < a class = "header-anchor" href = "#观察函数调用入口的参数和返回值" aria-hidden = "true" > #< / a > 观察函数调用入口的参数和返回值< / h3 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ < span class = "token function" > watch< / span > demo.MathGame primeFactors < span class = "token string" > " {params,returnObj}" < / span > < span class = "token parameter variable" > -x< / span > < span class = "token number" > 2< / span > < span class = "token parameter variable" > -b< / span >
Press Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class-cnt:1 , method-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 50< / span > ms.
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2018< / span > -12-03 < span class = "token number" > 19< / span > :23:23< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 0< / span > .0353ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Object< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > -1077465243< span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
null,
< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > 对比前一个例子，返回值为空（事件点为函数执行前，因此获取不到返回值）< / li > < / ul > < h3 id = "同时观察函数调用前和函数返回后" tabindex = "-1" > < a class = "header-anchor" href = "#同时观察函数调用前和函数返回后" aria-hidden = "true" > #< / a > 同时观察函数调用前和函数返回后< / h3 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ < span class = "token function" > watch< / span > demo.MathGame primeFactors < span class = "token string" > " {params,target,returnObj}" < / span > < span class = "token parameter variable" > -x< / span > < span class = "token number" > 2< / span > < span class = "token parameter variable" > -b< / span > < span class = "token parameter variable" > -s< / span > < span class = "token parameter variable" > -n< / span > < span class = "token number" > 2< / span >
Press Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class-cnt:1 , method-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 46< / span > ms.
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2018< / span > -12-03 < span class = "token number" > 19< / span > :29:54< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 0< / span > .01696ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Object< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 1< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
@MathGame< span class = "token punctuation" > [< / span >
< span class = "token assign-left variable" > random< / span > < span class = "token operator" > =< / span > @Random< span class = "token punctuation" > [< / span > java.util.Random@522b408a< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > illegalArgumentCount< / span > < span class = "token operator" > =< / span > @Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 13038< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
null,
< span class = "token punctuation" > ]< / span >
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2018< / span > -12-03 < span class = "token number" > 19< / span > :29:54< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 4< / span > .277392ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Object< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 1< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
@MathGame< span class = "token punctuation" > [< / span >
< span class = "token assign-left variable" > random< / span > < span class = "token operator" > =< / span > @Random< span class = "token punctuation" > [< / span > java.util.Random@522b408a< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > illegalArgumentCount< / span > < span class = "token operator" > =< / span > @Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 13038< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
@ArrayList< span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 2< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 2< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 2< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 5< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 5< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 73< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 241< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 439< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > < p > 参数里< code > -n 2< / code > ，表示只执行两次< / p > < / li > < li > < p > 这里输出结果中，第一次输出的是函数调用前的观察表达式的结果，第二次输出的是函数返回后的表达式的结果< / p > < / li > < li > < p > 结果的输出顺序和事件发生的先后顺序一致，和命令中 < code > -s -b< / code > 的顺序无关< / p > < / li > < / ul > < h3 id = "调整-x的值-观察具体的函数参数值" tabindex = "-1" > < a class = "header-anchor" href = "#调整-x的值-观察具体的函数参数值" aria-hidden = "true" > #< / a > 调整< code > -x< / code > 的值，观察具体的函数参数值< / h3 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ < span class = "token function" > watch< / span > demo.MathGame primeFactors < span class = "token string" > " {params,target}" < / span > < span class = "token parameter variable" > -x< / span > < span class = "token number" > 3< / span >
Press Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class-cnt:1 , method-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 58< / span > ms.
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2018< / span > -12-03 < span class = "token number" > 19< / span > :34:19< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 0< / span > .587833ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Object< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 1< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
@MathGame< span class = "token punctuation" > [< / span >
< span class = "token assign-left variable" > random< / span > < span class = "token operator" > =< / span > @Random< span class = "token punctuation" > [< / span >
< span class = "token assign-left variable" > serialVersionUID< / span > < span class = "token operator" > =< / span > @Long< span class = "token punctuation" > [< / span > < span class = "token number" > 3905348978240129619< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > seed< / span > < span class = "token operator" > =< / span > @AtomicLong< span class = "token punctuation" > [< / span > < span class = "token number" > 3133719055989< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > multiplier< / span > < span class = "token operator" > =< / span > @Long< span class = "token punctuation" > [< / span > < span class = "token number" > 25214903917< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > addend< / span > < span class = "token operator" > =< / span > @Long< span class = "token punctuation" > [< / span > < span class = "token number" > 11< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > mask< / span > < span class = "token operator" > =< / span > @Long< span class = "token punctuation" > [< / span > < span class = "token number" > 281474976710655< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > DOUBLE_UNIT< / span > < span class = "token operator" > =< / span > @Double< span class = "token punctuation" > [< / span > < span class = "token number" > 1< / span > .1102230246251565E-16< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > BadBound< / span > < span class = "token operator" > =< / span > @String< span class = "token punctuation" > [< / span > bound must be positive< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > BadRange< / span > < span class = "token operator" > =< / span > @String< span class = "token punctuation" > [< / span > bound must be greater than origin< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > BadSize< / span > < span class = "token operator" > =< / span > @String< span class = "token punctuation" > [< / span > size must be non-negative< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > seedUniquifier< / span > < span class = "token operator" > =< / span > @AtomicLong< span class = "token punctuation" > [< / span > -3282039941672302964< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > nextNextGaussian< / span > < span class = "token operator" > =< / span > @Double< span class = "token punctuation" > [< / span > < span class = "token number" > 0.0< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > haveNextNextGaussian< / span > < span class = "token operator" > =< / span > @Boolean< span class = "token punctuation" > [< / span > false< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > serialPersistentFields< / span > < span class = "token operator" > =< / span > @ObjectStreamField< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span > isEmpty< span class = "token operator" > =< / span > false< span class = "token punctuation" > ;< / span > < span class = "token assign-left variable" > size< / span > < span class = "token operator" > =< / span > < span class = "token number" > 3< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > unsafe< / span > < span class = "token operator" > =< / span > @Unsafe< span class = "token punctuation" > [< / span > sun.misc.Unsafe@2eaa1027< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > seedOffset< / span > < span class = "token operator" > =< / span > @Long< span class = "token punctuation" > [< / span > < span class = "token number" > 24< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > illegalArgumentCount< / span > < span class = "token operator" > =< / span > @Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 13159< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > < code > -x< / code > 表示遍历深度，可以调整来打印具体的参数和结果内容，默认值是 1。< / li > < li > < code > -x< / code > 最大值是 4， < code > ognl< / code > 表达式里指定更具体的 field。< / li > < / ul > < h3 id = "条件表达式的例子" tabindex = "-1" > < a class = "header-anchor" href = "#条件表达式的例子" aria-hidden = "true" > #< / a > 条件表达式的例子< / h3 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ < span class = "token function" > watch< / span > demo.MathGame primeFactors < span class = "token string" > " {params[0],target}" < / span > < span class = "token string" > " params[0]< 0" < / span >
Press Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class-cnt:1 , method-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 68< / span > ms.
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2018< / span > -12-03 < span class = "token number" > 19< / span > :36:04< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 0< / span > .530255ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > -18178089< span class = "token punctuation" > ]< / span > ,
@MathGame< span class = "token punctuation" > [< / span > demo.MathGame@41cf53f9< span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > 只有满足条件的调用，才会有响应。< / li > < / ul > < h3 id = "观察异常信息的例子" tabindex = "-1" > < a class = "header-anchor" href = "#观察异常信息的例子" aria-hidden = "true" > #< / a > 观察异常信息的例子< / h3 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ < span class = "token function" > watch< / span > demo.MathGame primeFactors < span class = "token string" > " {params[0],throwExp}" < / span > < span class = "token parameter variable" > -e< / span > < span class = "token parameter variable" > -x< / span > < span class = "token number" > 2< / span >
Press Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class-cnt:1 , method-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 62< / span > ms.
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2018< / span > -12-03 < span class = "token number" > 19< / span > :38:00< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 1< / span > .414993ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > -1120397038< span class = "token punctuation" > ]< / span > ,
java.lang.IllegalArgumentException: number is: -1120397038, need < span class = "token operator" > > =< / span > < span class = "token number" > 2< / span >
at demo.MathGame.primeFactors< span class = "token punctuation" > (< / span > MathGame.java:46< span class = "token punctuation" > )< / span >
at demo.MathGame.run< span class = "token punctuation" > (< / span > MathGame.java:24< span class = "token punctuation" > )< / span >
at demo.MathGame.main< span class = "token punctuation" > (< / span > MathGame.java:16< span class = "token punctuation" > )< / span >
,
< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > < code > -e< / code > 表示抛出异常时才触发< / li > < li > express 中，表示异常信息的变量是< code > throwExp< / code > < / li > < / ul > < h3 id = "按照耗时进行过滤" tabindex = "-1" > < a class = "header-anchor" href = "#按照耗时进行过滤" aria-hidden = "true" > #< / a > 按照耗时进行过滤< / h3 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ < span class = "token function" > watch< / span > demo.MathGame primeFactors < span class = "token string" > ' {params, returnObj}' < / span > < span class = "token string" > ' #cost> 200' < / span > < span class = "token parameter variable" > -x< / span > < span class = "token number" > 2< / span >
Press Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class-cnt:1 , method-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 66< / span > ms.
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2018< / span > -12-03 < span class = "token number" > 19< / span > :40:28< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 2112< / span > .168897ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Object< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 1< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
@ArrayList< span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 5< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 428379493< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > < code > #cost> 200< / code > (单位是< code > ms< / code > )表示只有当耗时大于 200ms 时才会输出，过滤掉执行时间小于 200ms 的调用< / li > < / ul > < h3 id = "观察当前对象中的属性" tabindex = "-1" > < a class = "header-anchor" href = "#观察当前对象中的属性" aria-hidden = "true" > #< / a > 观察当前对象中的属性< / h3 > < p > 如果想查看函数运行前后，当前对象中的属性，可以使用< code > target< / code > 关键字，代表当前对象< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ < span class = "token function" > watch< / span > demo.MathGame primeFactors < span class = "token string" > ' target' < / span >
Press Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class-cnt:1 , method-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 52< / span > ms.
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2018< / span > -12-03 < span class = "token number" > 19< / span > :41:52< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 0< / span > .477882ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @MathGame< span class = "token punctuation" > [< / span >
< span class = "token assign-left variable" > random< / span > < span class = "token operator" > =< / span > @Random< span class = "token punctuation" > [< / span > java.util.Random@522b408a< span class = "token punctuation" > ]< / span > ,
< span class = "token assign-left variable" > illegalArgumentCount< / span > < span class = "token operator" > =< / span > @Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 13355< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 然后使用< code > target.field_name< / code > 访问当前对象的某个属性< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ < span class = "token function" > watch< / span > demo.MathGame primeFactors < span class = "token string" > ' target.illegalArgumentCount' < / span >
Press Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class-cnt:1 , method-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 67< / span > ms.
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2018< / span > -12-03 < span class = "token number" > 20< / span > :04:34< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 131< / span > .303498ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 8< / span > < span class = "token punctuation" > ]< / span >
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2018< / span > -12-03 < span class = "token number" > 20< / span > :04:35< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 0< / span > .961441ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 8< / span > < span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h3 id = "获取类的静态字段、调用类的静态函数的例子" tabindex = "-1" > < a class = "header-anchor" href = "#获取类的静态字段、调用类的静态函数的例子" aria-hidden = "true" > #< / a > 获取类的静态字段、调用类的静态函数的例子< / h3 > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > < span class = "token function" > watch< / span > demo.MathGame * < span class = "token string" > ' {params,@demo.MathGame@random.nextInt(100)}' < / span > < span class = "token parameter variable" > -v< / span > < span class = "token parameter variable" > -n< / span > < span class = "token number" > 1< / span > < span class = "token parameter variable" > -x< / span > < span class = "token number" > 2< / span >
< span class = "token punctuation" > [< / span > arthas@6527< span class = "token punctuation" > ]< / span > $ < span class = "token function" > watch< / span > demo.MathGame * < span class = "token string" > ' {params,@demo.MathGame@random.nextInt(100)}' < / span > < span class = "token parameter variable" > -n< / span > < span class = "token number" > 1< / span > < span class = "token parameter variable" > -x< / span > < span class = "token number" > 2< / span >
Press Q or Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class count: < span class = "token number" > 1< / span > , method count: < span class = "token number" > 5< / span > < span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 34< / span > ms, listenerId: < span class = "token number" > 3< / span >
< span class = "token assign-left variable" > ts< / span > < span class = "token operator" > =< / span > < span class = "token number" > 2021< / span > -01-05 < span class = "token number" > 21< / span > :35:20< span class = "token punctuation" > ;< / span > < span class = "token punctuation" > [< / span > cost< span class = "token operator" > =< / span > < span class = "token number" > 0< / span > .173966ms< span class = "token punctuation" > ]< / span > < span class = "token assign-left variable" > result< / span > < span class = "token operator" > =< / span > @ArrayList< span class = "token punctuation" > [< / span >
@Object< span class = "token punctuation" > [< / span > < span class = "token punctuation" > ]< / span > < span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > -138282< span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 89< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > 注意这里使用 < code > Thread.currentThread().getContextClassLoader()< / code > 加载,使用精确< code > classloader< / code > < a href = "/doc/ognl.html" class = "" > ognl< / a > 更好。< / li > < / ul > < h3 id = "排除掉指定的类" tabindex = "-1" > < a class = "header-anchor" href = "#排除掉指定的类" aria-hidden = "true" > #< / a > 排除掉指定的类< / h3 > < div class = "custom-container tip" > < p class = "custom-container-title" > 提示< / p > < p > watch/trace/monitor/stack/tt 命令都支持 < code > --exclude-class-pattern< / code > 参数< / p > < / div > < p > 使用 < code > --exclude-class-pattern< / code > 参数可以排除掉指定的类，比如：< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > < span class = "token function" > watch< / span > javax.servlet.Filter * --exclude-class-pattern com.demo.TestFilter
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h3 id = "不匹配子类" tabindex = "-1" > < a class = "header-anchor" href = "#不匹配子类" aria-hidden = "true" > #< / a > 不匹配子类< / h3 > < p > 默认情况下 watch/trace/monitor/stack/tt 命令都会匹配子类。如果想不匹配，可以通过全局参数关掉。< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > options disable-sub-class < span class = "token boolean" > true< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < / div > < / div > < h3 id = "使用-v-参数打印更多信息" tabindex = "-1" > < a class = "header-anchor" href = "#使用-v-参数打印更多信息" aria-hidden = "true" > #< / a > 使用 -v 参数打印更多信息< / h3 > < div class = "custom-container tip" > < p class = "custom-container-title" > 提示< / p > < p > watch/trace/monitor/stack/tt 命令都支持 < code > -v< / code > 参数< / p > < / div > < p > 当命令执行之后，没有输出结果。有两种可能：< / p > < ol > < li > 匹配到的函数没有被执行< / li > < li > 条件表达式结果是 false< / li > < / ol > < p > 但用户区分不出是哪种情况。< / p > < p > 使用 < code > -v< / code > 选项，则会打印< code > Condition express< / code > 的具体值和执行结果，方便确认。< / p > < p > 比如：< / p > < div class = "language-text ext-text line-numbers-mode" > < pre class = "language-text" > < code > $ watch -v -x 2 demo.MathGame print ' params' ' params[0] > 100000'
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 29 ms, listenerId: 11
Condition express: params[0] > 100000 , result: false
Condition express: params[0] > 100000 , result: false
Condition express: params[0] > 100000 , result: true
ts=2020-12-02 22:38:56; [cost=0.060843ms] result=@Object[][
@Integer[200033],
@ArrayList[
@Integer[200033],
],
]
Condition express: params[0] > 100000 , result: true
ts=2020-12-02 22:38:57; [cost=0.052877ms] result=@Object[][
@Integer[123047],
@ArrayList[
@Integer[29],
@Integer[4243],
],
]
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < / div > <!-- [ --> <!-- ] --> < / div > < footer class = "page-meta right-menu-padding" data-v-fdd717e0 > < div class = "meta-item edit-link" > < a class = "external-link meta-item-label" href = "https://github.com/alibaba/arthas/edit/master/site/docs/doc/watch.md" rel = "noopener noreferrer" target = "_blank" aria-label = "在 GitHub 上编辑此页" > <!-- [ --> <!-- ] --> < span > 在 GitHub 上编辑此页< / span > < span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > <!-- [ --> <!-- ] --> < / a > < / div > < div class = "meta-item last-updated" > < span class = "meta-item-label" > Last Updated: < / span > <!-- --> < / div > < div class = "meta-item contributors" > < span class = "meta-item-label" > 贡献者: < / span > < span class = "meta-item-info" > <!-- [ --> <!-- [ --> < span class = "contributor" title = "email: hengyunabc@gmail.com" > hengyunabc< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: i@fatpandac.com" > Fatpandac< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: hengyunabc@users.noreply.github.com" > hengyunabc< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: 35672972+pandaapo@users.noreply.github.com" > pandaapo< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: hollowman186@vip.qq.com" > Hollow Man< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: snipercy@users.noreply.github.com" > vic< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: 983433479@qq.com" > 汪吉< / span > <!-- --> <!-- ] --> <!-- ] --> < / span > < / div > < / footer > < nav class = "page-nav right-menu-padding" data-v-fdd717e0 > < p class = "inner" > < span class = "prev" > < a href = "/doc/vmtool.html" class = "" aria-label = "vmtool" > <!-- [ --> <!-- ] --> vmtool <!-- [ --> <!-- ] --> < / a > < / span > <!-- --> < / p > < / nav > <!-- [ --> <!-- ] --> < / main > <!-- ] --> < / div > <!-- --> <!-- ] --> < / div >
< script type = "module" src = "/assets/app.6c27e557.js" defer > < / script >
< / body >
< / html >
