java查看class文件的方法

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1，首先使用javac编译文件

2，使用javap工具打开编辑出来的class文件

javap -verbose SyncTestDemo01.class

会得到如下结果：

D:\idea_workspace\basic_demo\out\production\basic_demo>javap -verbose SyncTestDemo01.class
Classfile /D:/idea_workspace/basic_demo/out/production/basic_demo/SyncTestDemo01.class
  Last modified 2019-8-25; size 863 bytes
  MD5 checksum a021136873e306367959a587cdbadbd6
  Compiled from "SyncTestDemo01.java"
public class SyncTestDemo01
  minor version: 0
  major version: 52
  flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
   #1 = Methodref          #12.#28        // java/lang/Object."":()V
   #2 = Long               5000l
   #4 = Methodref          #29.#30        // java/lang/Thread.sleep:(J)V
   #5 = Class              #31            // java/lang/InterruptedException
   #6 = Methodref          #5.#32         // java/lang/InterruptedException.printStackTrace:()V
   #7 = Fieldref           #33.#34        // java/lang/System.out:Ljava/io/PrintStream;
   #8 = String             #35            // synchronized for method
   #9 = Methodref          #36.#37        // java/io/PrintStream.println:(Ljava/lang/String;)V
  #10 = String             #38            // synchronized for method no method
  #11 = Class              #39            // SyncTestDemo01
  #12 = Class              #40            // java/lang/Object
  #13 = Utf8               
  #14 = Utf8               ()V
  #15 = Utf8               Code
  #16 = Utf8               LineNumberTable
  #17 = Utf8               LocalVariableTable
  #18 = Utf8               this
  #19 = Utf8               LSyncTestDemo01;
  #20 = Utf8               testSync
  #21 = Utf8               e
  #22 = Utf8               Ljava/lang/InterruptedException;
  #23 = Utf8               StackMapTable
  #24 = Class              #31            // java/lang/InterruptedException
  #25 = Utf8               test01
  #26 = Utf8               SourceFile
  #27 = Utf8               SyncTestDemo01.java
  #28 = NameAndType        #13:#14        // "":()V
  #29 = Class              #41            // java/lang/Thread
  #30 = NameAndType        #42:#43        // sleep:(J)V
  #31 = Utf8               java/lang/InterruptedException
  #32 = NameAndType        #44:#14        // printStackTrace:()V
  #33 = Class              #45            // java/lang/System
  #34 = NameAndType        #46:#47        // out:Ljava/io/PrintStream;
  #35 = Utf8               synchronized for method
  #36 = Class              #48            // java/io/PrintStream
  #37 = NameAndType        #49:#50        // println:(Ljava/lang/String;)V
  #38 = Utf8               synchronized for method no method
  #39 = Utf8               SyncTestDemo01
  #40 = Utf8               java/lang/Object
  #41 = Utf8               java/lang/Thread
  #42 = Utf8               sleep
  #43 = Utf8               (J)V
  #44 = Utf8               printStackTrace
  #45 = Utf8               java/lang/System
  #46 = Utf8               out
  #47 = Utf8               Ljava/io/PrintStream;
  #48 = Utf8               java/io/PrintStream
  #49 = Utf8               println
  #50 = Utf8               (Ljava/lang/String;)V
{
  public SyncTestDemo01();
    descriptor: ()V
    flags: ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #1                  // Method java/lang/Object."":()V
         4: return
      LineNumberTable:
        line 1: 0
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0       5     0  this   LSyncTestDemo01;

  public synchronized void testSync();
    descriptor: ()V
    flags: ACC_PUBLIC, ACC_SYNCHRONIZED
    Code:
      stack=2, locals=2, args_size=1
         0: ldc2_w        #2                  // long 5000l
         3: invokestatic  #4                  // Method java/lang/Thread.sleep:(J)V
         6: goto          14
         9: astore_1
        10: aload_1
        11: invokevirtual #6                  // Method java/lang/InterruptedException.printStackTrace:()V
        14: getstatic     #7                  // Field java/lang/System.out:Ljava/io/PrintStream;
        17: ldc           #8                  // String synchronized for method
        19: invokevirtual #9                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
        22: return
      Exception table:
         from    to  target type
             0     6     9   Class java/lang/InterruptedException
      LineNumberTable:
        line 5: 0
        line 8: 6
        line 6: 9
        line 7: 10
        line 9: 14
        line 10: 22
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
           10       4     1     e   Ljava/lang/InterruptedException;
            0      23     0  this   LSyncTestDemo01;
      StackMapTable: number_of_entries = 2
        frame_type = 73 /* same_locals_1_stack_item */
          stack = [ class java/lang/InterruptedException ]
        frame_type = 4 /* same */

  public void test01();
    descriptor: ()V
    flags: ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
         0: getstatic     #7                  // Field java/lang/System.out:Ljava/io/PrintStream;
         3: ldc           #10                 // String synchronized for method no method
         5: invokevirtual #9                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
         8: return
      LineNumberTable:
        line 13: 0
        line 14: 8
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0       9     0  this   LSyncTestDemo01;
}
SourceFile: "SyncTestDemo01.java"

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