测试Javap

public class Test {
    private int a;
    int b = 10;
    String name;
    String nick = "tom";

}

执行javap命令

javap -verbose Test.class
输出如下：
Classfile /D:/workspace/java/*****/java/Test.class
  Last modified 2019-10-14; size 310 bytes
  MD5 checksum 19366669865106a6ae47a9005c031366
  Compiled from "Test.java"
public class Test
  minor version: 0
  major version: 52
  flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
   #1 = Methodref          #6.#19         // java/lang/Object."<init>":()V
   #2 = Fieldref           #5.#20         // Test.b:I
   #3 = String             #21            // tom
   #4 = Fieldref           #5.#22         // Test.nick:Ljava/lang/String;
   #5 = Class              #23            // Test
   #6 = Class              #24            // java/lang/Object
   #7 = Utf8               a
   #8 = Utf8               I
   #9 = Utf8               b
  #10 = Utf8               name
  #11 = Utf8               Ljava/lang/String;
  #12 = Utf8               nick
  #13 = Utf8               <init>
  #14 = Utf8               ()V
  #15 = Utf8               Code
  #16 = Utf8               LineNumberTable
  #17 = Utf8               SourceFile
  #18 = Utf8               Test.java
  #19 = NameAndType        #13:#14        // "<init>":()V
  #20 = NameAndType        #9:#8          // b:I
  #21 = Utf8               tom
  #22 = NameAndType        #12:#11        // nick:Ljava/lang/String;
  #23 = Utf8               Test
  #24 = Utf8               java/lang/Object
{
  int b;
    descriptor: I
    flags:

  java.lang.String name;
    descriptor: Ljava/lang/String;
    flags:

  java.lang.String nick;
    descriptor: Ljava/lang/String;
    flags:

  public Test();
    descriptor: ()V
    flags: ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
         0: aload_0
         1: invokespecial #1                  // Method java/lang/Object."<init>":()V
         4: aload_0
         5: bipush        10
         7: putfield      #2                  // Field b:I
        10: aload_0
        11: ldc           #3                  // String tom
        13: putfield      #4                  // Field nick:Ljava/lang/String;
        16: return
      LineNumberTable:
        line 6: 0
        line 8: 4
        line 10: 10
}
SourceFile: "Test.java"