javap反编译

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javac 反编译

#口语换反编译
javap -verbose

javap -l -p 

javap -verbose ClassA 
警告: 文件 ./ClassA.class 不包含类 ClassA
Classfile /Volumes/SHARE/github/study/basic/src/main/java/com/luo/basic/classload/ClassA.class
  Last modified 2019年4月9日; size 425 bytes
  MD5 checksum 2b78cd3c3746bf45ab41717cd4843bd1
  Compiled from "ClassA.java"
public class com.luo.basic.classload.ClassA
  minor version: 0
  major version: 55
  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: #5                          // com/luo/basic/classload/ClassA
  super_class: #6                         // java/lang/Object
  interfaces: 0, fields: 0, methods: 2, attributes: 1
Constant pool:
   #1 = Methodref          #6.#14         // java/lang/Object."<init>":()V
   #2 = Fieldref           #15.#16        // java/lang/System.out:Ljava/io/PrintStream;
   #3 = String             #17            // hello My Class A
   #4 = Methodref          #18.#19        // java/io/PrintStream.println:(Ljava/lang/String;)V
   #5 = Class              #20            // com/luo/basic/classload/ClassA
   #6 = Class              #21            // java/lang/Object
   #7 = Utf8               <init>
   #8 = Utf8               ()V
   #9 = Utf8               Code
  #10 = Utf8               LineNumberTable
  #11 = Utf8               <clinit>
  #12 = Utf8               SourceFile
  #13 = Utf8               ClassA.java
  #14 = NameAndType        #7:#8          // "<init>":()V
  #15 = Class              #22            // java/lang/System
  #16 = NameAndType        #23:#24        // out:Ljava/io/PrintStream;
  #17 = Utf8               hello My Class A
  #18 = Class              #25            // java/io/PrintStream
  #19 = NameAndType        #26:#27        // println:(Ljava/lang/String;)V
  #20 = Utf8               com/luo/basic/classload/ClassA
  #21 = Utf8               java/lang/Object
  #22 = Utf8               java/lang/System
  #23 = Utf8               out
  #24 = Utf8               Ljava/io/PrintStream;
  #25 = Utf8               java/io/PrintStream
  #26 = Utf8               println
  #27 = Utf8               (Ljava/lang/String;)V
{
  public com.luo.basic.classload.ClassA();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #1                  // Method java/lang/Object."<init>":()V
         4: return
      LineNumberTable:
        line 7: 0

  static {};
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: getstatic     #2                  // Field java/lang/System.out:Ljava/io/PrintStream;
         3: ldc           #3                  // String hello My Class A
         5: invokevirtual #4                  // Method java/io/PrintStream.println:(Ljava/lang/String;)V
         8: return
      LineNumberTable:
        line 10: 0
        line 11: 8
}
SourceFile: "ClassA.java"

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