Java虚拟机的常用指令汇总（含有案例说明）

待我称王封你为后i 2023-03-01 12:59 21阅读 0赞

1、反编译Java class 字节码文件命令

javap -v StackStruTest.class

结果：

$ javap -v StackStruTest.class
    Classfile /E:/workspace/JVMDemo/out/production/chapter01/com/rh/java/StackStruTest.class
      Last modified 2020-7-26; size 430 bytes
      MD5 checksum b1cfa494fb398acffd304335c6b4dcd4
      Compiled from "StackStruTest.java"
    public class com.rh.java.StackStruTest
      minor version: 0
      major version: 52
      flags: ACC_PUBLIC, ACC_SUPER
    Constant pool:
       #1 = Methodref          #3.#19         // java/lang/Object."<init>":()V
       #2 = Class              #20            // com/rh/java/StackStruTest
       #3 = Class              #21            // java/lang/Object
       #4 = Utf8               <init>
       #5 = Utf8               ()V
       #6 = Utf8               Code
       #7 = Utf8               LineNumberTable
       #8 = Utf8               LocalVariableTable
       #9 = Utf8               this
      #10 = Utf8               Lcom/rh/java/StackStruTest;
      #11 = Utf8               main
      #12 = Utf8               ([Ljava/lang/String;)V
      #13 = Utf8               args
      #14 = Utf8               [Ljava/lang/String;
      #15 = Utf8               i
      #16 = Utf8               I
      #17 = Utf8               SourceFile
      #18 = Utf8               StackStruTest.java
      #19 = NameAndType        #4:#5          // "<init>":()V
      #20 = Utf8               com/rh/java/StackStruTest
      #21 = Utf8               java/lang/Object
    { 
      public com.rh.java.StackStruTest();
        descriptor: ()V
        flags: 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 3: 0
          LocalVariableTable:
            Start  Length  Slot  Name   Signature
                0       5     0  this   Lcom/rh/java/StackStruTest;
    
      public static void main(java.lang.String[]);
        descriptor: ([Ljava/lang/String;)V
        flags: ACC_PUBLIC, ACC_STATIC
        Code:
          stack=1, locals=2, args_size=1
             0: iconst_5
             1: istore_1
             2: return
          LineNumberTable:
            line 5: 0
            line 6: 2
          LocalVariableTable:
            Start  Length  Slot  Name   Signature
                0       3     0  args   [Ljava/lang/String;
                2       1     1     i   I
    }
    SourceFile: "StackStruTest.java"

2、查看当前Java程序中的进程命令

jps

结果：

$ jps
    13456 StackStruTest
    14272 Jps
    14148 Launcher
    4648