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< span id = "watch" > < / span > < h1 > watch< a class = "headerlink" href = "#watch" title = "永久链接至标题" > ¶< / a > < / h1 >
< blockquote >
< div > 方法执行数据观测< / div > < / blockquote >
< p > 让你能方便的观察到指定方法的调用情况。能观察到的范围为：< code class = "docutils literal notranslate" > < span class = "pre" > 返回值< / span > < / code > 、< code class = "docutils literal notranslate" > < span class = "pre" > 抛出异常< / span > < / code > 、< code class = "docutils literal notranslate" > < span class = "pre" > 入参< / span > < / code > ，通过编写 < / p >
< div class = "section" id = "" >
< span id = "id1" > < / span > < h2 > 参数说明< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< p > watch 的参数比较多，主要是因为它能在 4 个不同的场景观察对象< / p >
< table border = "1" class = "docutils" >
< thead >
< tr >
< th align = "right" > 参数名称< / th >
< th align = "left" > 参数说明< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td align = "right" > < em > class-pattern< / em > < / td >
< td align = "left" > 类名表达式匹配< / td >
< / tr >
< tr >
< td align = "right" > < em > method-pattern< / em > < / td >
< td align = "left" > 方法名表达式匹配< / td >
< / tr >
< tr >
< td align = "right" > < em > express< / em > < / td >
< td align = "left" > 观察表达式< / td >
< / tr >
< tr >
< td align = "right" > < em > condition-express< / em > < / td >
< td align = "left" > 条件表达式< / td >
< / tr >
< tr >
< td align = "right" > [b]< / td >
< td align = "left" > 在< strong > 方法调用之前< / strong > 观察< / td >
< / tr >
< tr >
< td align = "right" > [e]< / td >
< td align = "left" > 在< strong > 方法异常之后< / strong > 观察< / td >
< / tr >
< tr >
< td align = "right" > [s]< / td >
< td align = "left" > 在< strong > 方法返回之后< / strong > 观察< / td >
< / tr >
< tr >
< td align = "right" > [f]< / td >
< td align = "left" > 在< strong > 方法结束之后< / strong > (正常返回和异常返回)观察< / td >
< / tr >
< tr >
< td align = "right" > [E]< / td >
< td align = "left" > 开启正则表达式匹配，默认为通配符匹配< / td >
< / tr >
< tr >
< td align = "right" > [x:]< / td >
< td align = "left" > 指定输出结果的属性遍历深度，默认为 1< / td >
< / tr >
< / tbody >
< / table > < p > 这里重点要说明的是观察表达式，观察表达式的构成主要由 < code class = "docutils literal notranslate" > < span class = "pre" > " {params,returnObj}" < / span > < / code > ，只要是一个合法的 ognl 表达式，都能被正常支持。< / p >
< p > 观察的维度也比较多，主要体现在参数 < code class = "docutils literal notranslate" > < span class = "pre" > advice< / span > < / code > 的数据结构上。< code class = "docutils literal notranslate" > < span class = "pre" > Advice< / span > < / code > 参数最主要是封装了通知节点的所有信息。请参考< a class = "reference internal" href = "advice-class.html" > < span class = "doc" > 表达式核心变量< / span > < / a > 中关于该节点的描述。< / p >
< ul class = "simple" >
< li > 特殊用法请参考：< a class = "reference external" href = "https://github.com/alibaba/arthas/issues/71" > https://github.com/alibaba/arthas/issues/71< / a > < / li >
< li > OGNL表达式官网： < a class = "reference external" href = "https://commons.apache.org/proper/commons-ognl/language-guide.html" > https://commons.apache.org/proper/commons-ognl/language-guide.html< / a > < / li >
< / ul >
< p > < strong > 特别说明< / strong > ： < / p >
< ul class = "simple" >
< li > watch 命令定义了4个观察事件点， < code class = "docutils literal notranslate" > < span class = "pre" > -b< / span > < / code > 方法调用前，< code class = "docutils literal notranslate" > < span class = "pre" > -e< / span > < / code > 方法异常后，< code class = "docutils literal notranslate" > < span class = "pre" > -s< / span > < / code > 方法返回后，< code class = "docutils literal notranslate" > < span class = "pre" > -f< / span > < / code > 方法结束后< / li >
< li > 4个观察事件点 < code class = "docutils literal notranslate" > < span class = "pre" > -b< / span > < / code > 、< code class = "docutils literal notranslate" > < span class = "pre" > -e< / span > < / code > 、< code class = "docutils literal notranslate" > < span class = "pre" > -s< / span > < / code > 默认关闭，< code class = "docutils literal notranslate" > < span class = "pre" > -f< / span > < / code > 默认打开，当指定观察点被打开后，在相应事件点会对观察表达式进行求值并输出< / li >
< li > 这里要注意< code class = "docutils literal notranslate" > < span class = "pre" > 方法入参< / span > < / code > 和< code class = "docutils literal notranslate" > < span class = "pre" > 方法出参< / span > < / code > 的区别，有可能在中间被修改导致前后不一致，除了 < code class = "docutils literal notranslate" > < span class = "pre" > -b< / span > < / code > 事件点 < code class = "docutils literal notranslate" > < span class = "pre" > params< / span > < / code > 代表方法入参外，其余事件都代表方法出参< / li >
< li > 当使用 < code class = "docutils literal notranslate" > < span class = "pre" > -b< / span > < / code > 时，由于观察事件点是在方法调用前，此时返回值或异常均不存在< / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id2" > < / span > < h2 > 使用参考< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "section" id = "demo" >
< span id = "demo" > < / span > < h3 > 启动 Demo< a class = "headerlink" href = "#demo" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > 启动< a class = "reference internal" href = "quick-start.html" > < span class = "doc" > 快速入门< / span > < / a > 里的< code class = "docutils literal notranslate" > < span class = "pre" > arthas-demo< / span > < / code > 。< / p >
< / div >
< div class = "section" id = "" >
< span id = "id3" > < / span > < h3 > 观察方法出参和返回值< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > $ watch demo.MathGame primeFactors < span class = "s2" > " {params,returnObj}" < / span > -x < span class = "m" > 2< / span >
Press Ctrl+C to abort.
Affect< span class = "o" > (< / span > class-cnt:1 , method-cnt:1< span class = "o" > )< / span > cost in < span class = "m" > 44< / span > ms.
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 19< / span > :16:51< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 1< / span > .280502ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @ArrayList< span class = "o" > [< / span >
@Object< span class = "o" > [][< / span >
@Integer< span class = "o" > [< / span > < span class = "m" > 535629513< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
@ArrayList< span class = "o" > [< / span >
@Integer< span class = "o" > [< / span > < span class = "m" > 3< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 19< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 191< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 49199< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
< span class = "o" > ]< / span >
< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "" >
< span id = "id4" > < / span > < h3 > 观察方法入参< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > $ watch demo.MathGame primeFactors < span class = "s2" > " {params,returnObj}" < / span > -x < span class = "m" > 2< / span > -b
Press Ctrl+C to abort.
Affect< span class = "o" > (< / span > class-cnt:1 , method-cnt:1< span class = "o" > )< / span > cost in < span class = "m" > 50< / span > ms.
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 19< / span > :23:23< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 0< / span > .0353ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @ArrayList< span class = "o" > [< / span >
@Object< span class = "o" > [][< / span >
@Integer< span class = "o" > [< / span > -1077465243< span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
null,
< span class = "o" > ]< / span >
< / pre > < / div >
< / div >
< ul class = "simple" >
< li > 对比前一个例子，返回值为空（事件点为方法执行前，因此获取不到返回值）< / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id5" > < / span > < h3 > 同时观察方法调用前和方法返回后< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > $ watch demo.MathGame primeFactors < span class = "s2" > " {params,target,returnObj}" < / span > -x < span class = "m" > 2< / span > -b -s -n < span class = "m" > 2< / span >
Press Ctrl+C to abort.
Affect< span class = "o" > (< / span > class-cnt:1 , method-cnt:1< span class = "o" > )< / span > cost in < span class = "m" > 46< / span > ms.
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 19< / span > :29:54< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 0< / span > .01696ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @ArrayList< span class = "o" > [< / span >
@Object< span class = "o" > [][< / span >
@Integer< span class = "o" > [< / span > < span class = "m" > 1544665400< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
@MathGame< span class = "o" > [< / span >
< span class = "nv" > random< / span > < span class = "o" > =< / span > @Random< span class = "o" > [< / span > java.util.Random@522b408a< span class = "o" > ]< / span > ,
< span class = "nv" > illegalArgumentCount< / span > < span class = "o" > =< / span > @Integer< span class = "o" > [< / span > < span class = "m" > 13038< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
null,
< span class = "o" > ]< / span >
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 19< / span > :29:54< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 4< / span > .277392ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @ArrayList< span class = "o" > [< / span >
@Object< span class = "o" > [][< / span >
@Integer< span class = "o" > [< / span > < span class = "m" > 1544665400< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
@MathGame< span class = "o" > [< / span >
< span class = "nv" > random< / span > < span class = "o" > =< / span > @Random< span class = "o" > [< / span > java.util.Random@522b408a< span class = "o" > ]< / span > ,
< span class = "nv" > illegalArgumentCount< / span > < span class = "o" > =< / span > @Integer< span class = "o" > [< / span > < span class = "m" > 13038< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
@ArrayList< span class = "o" > [< / span >
@Integer< span class = "o" > [< / span > < span class = "m" > 2< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 2< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 2< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 5< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 5< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 73< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 241< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 439< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
< span class = "o" > ]< / span >
< / pre > < / div >
< / div >
< ul class = "simple" >
< li > 参数里< code class = "docutils literal notranslate" > < span class = "pre" > -n< / span > < span class = "pre" > 2< / span > < / code > ，表示只执行两次< / li >
< li > 这里输出结果中，第一次输出的是方法调用前的观察表达式的结果，第二次输出的是方法返回后的表达式的结果< / li >
< li > 结果的顺序和命令中 < code class = "docutils literal notranslate" > < span class = "pre" > -s< / span > < span class = "pre" > -b< / span > < / code > 的顺序没有关系，只与事件本身的先后顺序有关< / li >
< / ul >
< / div >
< div class = "section" id = "x" >
< span id = "x" > < / span > < h3 > 调整< code class = "docutils literal notranslate" > < span class = "pre" > -x< / span > < / code > 的值，观察具体的方法参数值< a class = "headerlink" href = "#x" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > $ watch demo.MathGame primeFactors < span class = "s2" > " {params,target}" < / span > -x < span class = "m" > 3< / span >
Press Ctrl+C to abort.
Affect< span class = "o" > (< / span > class-cnt:1 , method-cnt:1< span class = "o" > )< / span > cost in < span class = "m" > 58< / span > ms.
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 19< / span > :34:19< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 0< / span > .587833ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @ArrayList< span class = "o" > [< / span >
@Object< span class = "o" > [][< / span >
@Integer< span class = "o" > [< / span > < span class = "m" > 47816758< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
@MathGame< span class = "o" > [< / span >
< span class = "nv" > random< / span > < span class = "o" > =< / span > @Random< span class = "o" > [< / span >
< span class = "nv" > serialVersionUID< / span > < span class = "o" > =< / span > @Long< span class = "o" > [< / span > < span class = "m" > 3905348978240129619< / span > < span class = "o" > ]< / span > ,
< span class = "nv" > seed< / span > < span class = "o" > =< / span > @AtomicLong< span class = "o" > [< / span > < span class = "m" > 3133719055989< / span > < span class = "o" > ]< / span > ,
< span class = "nv" > multiplier< / span > < span class = "o" > =< / span > @Long< span class = "o" > [< / span > < span class = "m" > 25214903917< / span > < span class = "o" > ]< / span > ,
< span class = "nv" > addend< / span > < span class = "o" > =< / span > @Long< span class = "o" > [< / span > < span class = "m" > 11< / span > < span class = "o" > ]< / span > ,
< span class = "nv" > mask< / span > < span class = "o" > =< / span > @Long< span class = "o" > [< / span > < span class = "m" > 281474976710655< / span > < span class = "o" > ]< / span > ,
< span class = "nv" > DOUBLE_UNIT< / span > < span class = "o" > =< / span > @Double< span class = "o" > [< / span > < span class = "m" > 1< / span > .1102230246251565E-16< span class = "o" > ]< / span > ,
< span class = "nv" > BadBound< / span > < span class = "o" > =< / span > @String< span class = "o" > [< / span > bound must be positive< span class = "o" > ]< / span > ,
< span class = "nv" > BadRange< / span > < span class = "o" > =< / span > @String< span class = "o" > [< / span > bound must be greater than origin< span class = "o" > ]< / span > ,
< span class = "nv" > BadSize< / span > < span class = "o" > =< / span > @String< span class = "o" > [< / span > size must be non-negative< span class = "o" > ]< / span > ,
< span class = "nv" > seedUniquifier< / span > < span class = "o" > =< / span > @AtomicLong< span class = "o" > [< / span > -3282039941672302964< span class = "o" > ]< / span > ,
< span class = "nv" > nextNextGaussian< / span > < span class = "o" > =< / span > @Double< span class = "o" > [< / span > < span class = "m" > 0< / span > .0< span class = "o" > ]< / span > ,
< span class = "nv" > haveNextNextGaussian< / span > < span class = "o" > =< / span > @Boolean< span class = "o" > [< / span > false< span class = "o" > ]< / span > ,
< span class = "nv" > serialPersistentFields< / span > < span class = "o" > =< / span > @ObjectStreamField< span class = "o" > [][< / span > < span class = "nv" > isEmpty< / span > < span class = "o" > =< / span > false< span class = "p" > ;< / span > < span class = "nv" > size< / span > < span class = "o" > =< / span > < span class = "m" > 3< / span > < span class = "o" > ]< / span > ,
< span class = "nv" > unsafe< / span > < span class = "o" > =< / span > @Unsafe< span class = "o" > [< / span > sun.misc.Unsafe@2eaa1027< span class = "o" > ]< / span > ,
< span class = "nv" > seedOffset< / span > < span class = "o" > =< / span > @Long< span class = "o" > [< / span > < span class = "m" > 24< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
< span class = "nv" > illegalArgumentCount< / span > < span class = "o" > =< / span > @Integer< span class = "o" > [< / span > < span class = "m" > 13159< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
< span class = "o" > ]< / span >
< / pre > < / div >
< / div >
< ul class = "simple" >
< li > < code class = "docutils literal notranslate" > < span class = "pre" > -x< / span > < / code > 表示遍历深度， ， < / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id6" > < / span > < h3 > 条件表达式的例子< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > $ watch demo.MathGame primeFactors < span class = "s2" > " {params[0],target}" < / span > < span class = "s2" > " params[0]< 0" < / span >
Press Ctrl+C to abort.
Affect< span class = "o" > (< / span > class-cnt:1 , method-cnt:1< span class = "o" > )< / span > cost in < span class = "m" > 68< / span > ms.
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 19< / span > :36:04< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 0< / span > .530255ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @ArrayList< span class = "o" > [< / span >
@Integer< span class = "o" > [< / span > -18178089< span class = "o" > ]< / span > ,
@MathGame< span class = "o" > [< / span > demo.MathGame@41cf53f9< span class = "o" > ]< / span > ,
< span class = "o" > ]< / span >
< / pre > < / div >
< / div >
< ul class = "simple" >
< li > 只有满足条件的调用，才会有响应。< / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id7" > < / span > < h3 > 观察异常信息的例子< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > $ watch demo.MathGame primeFactors < span class = "s2" > " {params[0],throwExp}" < / span > -e -x < span class = "m" > 2< / span >
Press Ctrl+C to abort.
Affect< span class = "o" > (< / span > class-cnt:1 , method-cnt:1< span class = "o" > )< / span > cost in < span class = "m" > 62< / span > ms.
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 19< / span > :38:00< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 1< / span > .414993ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @ArrayList< span class = "o" > [< / span >
@Integer< span class = "o" > [< / span > -1120397038< span class = "o" > ]< / span > ,
java.lang.IllegalArgumentException: number is: -1120397038, need > < span class = "o" > =< / span > < span class = "m" > 2< / span >
at demo.MathGame.primeFactors< span class = "o" > (< / span > MathGame.java:46< span class = "o" > )< / span >
at demo.MathGame.run< span class = "o" > (< / span > MathGame.java:24< span class = "o" > )< / span >
at demo.MathGame.main< span class = "o" > (< / span > MathGame.java:16< span class = "o" > )< / span >
,
< span class = "o" > ]< / span >
< / pre > < / div >
< / div >
< ul class = "simple" >
< li > < code class = "docutils literal notranslate" > < span class = "pre" > -e< / span > < / code > < / li >
< li > express中， < code class = "docutils literal notranslate" > < span class = "pre" > throwExp< / span > < / code > < / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id8" > < / span > < h3 > 按照耗时进行过滤< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > $ watch demo.MathGame primeFactors < span class = "s1" > ' {params, returnObj}' < / span > < span class = "s1" > ' #cost> 200' < / span > -x < span class = "m" > 2< / span >
Press Ctrl+C to abort.
Affect< span class = "o" > (< / span > class-cnt:1 , method-cnt:1< span class = "o" > )< / span > cost in < span class = "m" > 66< / span > ms.
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 19< / span > :40:28< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 2112< / span > .168897ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @ArrayList< span class = "o" > [< / span >
@Object< span class = "o" > [][< / span >
@Integer< span class = "o" > [< / span > < span class = "m" > 2141897465< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
@ArrayList< span class = "o" > [< / span >
@Integer< span class = "o" > [< / span > < span class = "m" > 5< / span > < span class = "o" > ]< / span > ,
@Integer< span class = "o" > [< / span > < span class = "m" > 428379493< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span > ,
< span class = "o" > ]< / span >
< / pre > < / div >
< / div >
< ul class = "simple" >
< li > < code class = "docutils literal notranslate" > < span class = "pre" > #cost> 200< / span > < / code > (单位是< code class = "docutils literal notranslate" > < span class = "pre" > ms< / span > < / code > )表示只有当耗时大于200ms时才会输出， < / li >
< / ul >
< / div >
< div class = "section" id = "" >
< span id = "id9" > < / span > < h3 > 观察当前对象中的属性< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > 如果想查看方法运行前后，当前对象中的属性，可以使用< code class = "docutils literal notranslate" > < span class = "pre" > target< / span > < / code > 关键字，代表当前对象< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > $ watch demo.MathGame primeFactors < span class = "s1" > ' target' < / span >
Press Ctrl+C to abort.
Affect< span class = "o" > (< / span > class-cnt:1 , method-cnt:1< span class = "o" > )< / span > cost in < span class = "m" > 52< / span > ms.
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 19< / span > :41:52< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 0< / span > .477882ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @MathGame< span class = "o" > [< / span >
< span class = "nv" > random< / span > < span class = "o" > =< / span > @Random< span class = "o" > [< / span > java.util.Random@522b408a< span class = "o" > ]< / span > ,
< span class = "nv" > illegalArgumentCount< / span > < span class = "o" > =< / span > @Integer< span class = "o" > [< / span > < span class = "m" > 13355< / span > < span class = "o" > ]< / span > ,
< span class = "o" > ]< / span >
< / pre > < / div >
< / div >
< p > 然后使用< code class = "docutils literal notranslate" > < span class = "pre" > target.field_name< / span > < / code > 访问当前对象的某个属性< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight" > < pre > < span > < / span > $ watch demo.MathGame primeFactors < span class = "s1" > ' target.illegalArgumentCount' < / span >
Press Ctrl+C to abort.
Affect< span class = "o" > (< / span > class-cnt:1 , method-cnt:1< span class = "o" > )< / span > cost in < span class = "m" > 67< / span > ms.
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 20< / span > :04:34< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 131< / span > .303498ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @Integer< span class = "o" > [< / span > < span class = "m" > 8< / span > < span class = "o" > ]< / span >
< span class = "nv" > ts< / span > < span class = "o" > =< / span > < span class = "m" > 2018< / span > -12-03 < span class = "m" > 20< / span > :04:35< span class = "p" > ;< / span > < span class = "o" > [< / span > < span class = "nv" > cost< / span > < span class = "o" > =< / span > < span class = "m" > 0< / span > .961441ms< span class = "o" > ]< / span > < span class = "nv" > result< / span > < span class = "o" > =< / span > @Integer< span class = "o" > [< / span > < span class = "m" > 8< / span > < span class = "o" > ]< / span >
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