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# sc
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[`sc`在线教程](https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&id=command-sc)
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::: tip
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查看 JVM 已加载的类信息
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:::
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“Search-Class” 的简写，这个命令能搜索出所有已经加载到 JVM 中的 Class 信息，这个命令支持的参数有 `[d]`、`[E]`、`[f]` 和 `[x:]`。
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## 参数说明
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| 参数名称 | 参数说明 |
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| --------------------: | :---------------------------------------------------------------------------------------------------------------------------------------------------- |
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| _class-pattern_ | 类名表达式匹配 |
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| _method-pattern_ | 方法名表达式匹配 |
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| [d] | 输出当前类的详细信息，包括这个类所加载的原始文件来源、类的声明、加载的 ClassLoader 等详细信息。<br/>如果一个类被多个 ClassLoader 所加载，则会出现多次 |
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| [E] | 开启正则表达式匹配，默认为通配符匹配 |
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| [f] | 输出当前类的成员变量信息（需要配合参数-d 一起使用） |
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| [x:] | 指定输出静态变量时属性的遍历深度，默认为 0，即直接使用 `toString` 输出 |
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| `[c:]` | 指定 class 的 ClassLoader 的 hashcode |
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| `[classLoaderClass:]` | 指定执行表达式的 ClassLoader 的 class name |
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| `[n:]` | 具有详细信息的匹配类的最大数量（默认为 100） |
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| `[cs <arg>]` | 指定 class 的 ClassLoader#toString() 返回值。长格式`[classLoaderStr <arg>]` |
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::: tip
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class-pattern 支持全限定名，如 com.taobao.test.AAA，也支持 com/taobao/test/AAA 这样的格式，这样，我们从异常堆栈里面把类名拷贝过来的时候，不需要在手动把`/`替换为`.`啦。
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:::
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::: tip
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sc 默认开启了子类匹配功能，也就是说所有当前类的子类也会被搜索出来，想要精确的匹配，请打开`options disable-sub-class true`开关
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:::
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## 使用参考
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- 模糊搜索
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```bash
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$ sc demo.*
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demo.MathGame
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Affect(row-cnt:1) cost in 55 ms.
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```
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- 打印类的详细信息
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```bash
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$ sc -d demo.MathGame
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class-info demo.MathGame
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code-source /private/tmp/math-game.jar
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name demo.MathGame
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isInterface false
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isAnnotation false
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isEnum false
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isAnonymousClass false
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isArray false
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isLocalClass false
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isMemberClass false
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isPrimitive false
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isSynthetic false
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simple-name MathGame
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modifier public
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annotation
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interfaces
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super-class +-java.lang.Object
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class-loader +-sun.misc.Launcher$AppClassLoader@3d4eac69
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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classLoaderHash 3d4eac69
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Affect(row-cnt:1) cost in 875 ms.
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```
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- 打印出类的 Field 信息
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```bash
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$ sc -d -f demo.MathGame
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class-info demo.MathGame
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code-source /private/tmp/math-game.jar
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name demo.MathGame
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isInterface false
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isAnnotation false
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isEnum false
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isAnonymousClass false
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isArray false
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isLocalClass false
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isMemberClass false
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isPrimitive false
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isSynthetic false
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simple-name MathGame
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modifier public
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annotation
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interfaces
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super-class +-java.lang.Object
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class-loader +-sun.misc.Launcher$AppClassLoader@3d4eac69
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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classLoaderHash 3d4eac69
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fields modifierprivate,static
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type java.util.Random
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name random
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value java.util.Random@522b4
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08a
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modifierprivate
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type int
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name illegalArgumentCount
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Affect(row-cnt:1) cost in 19 ms.
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```
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- 通过 ClassLoader#toString 查找类（前提：有一个 toString()返回值是`apo`的类加载器，加载的类中包含`demo.MathGame`, `demo.MyBar`,` demo.MyFoo`3 个类）
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```bash
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$ sc -cs apo *demo*
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demo.MathGame
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demo.MyBar
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demo.MyFoo
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Affect(row-cnt:3) cost in 56 ms.
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```
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