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一、javac命令：编译

上面支持中文！

上面仅支持英文！

总结：javac命令可以把java源文件(.java)编译成字节码文件(.class)

二、java命令：执行(必须要有main方法)

注意：上面执行的是Test.class文件，命令中不能有拓展名！

二、javap命令：反汇编

示例1：只显示反汇编后的Java代码

示例2：既显示反汇编后的Java代码，也显示字节码指令(Java语言的汇编指令)

C:\Users\FDDLC\Desktop\code>javap -v PersonClassfile /C:/Users/FDDLC/Desktop/code/Person.class  Last modified 2021年5月8日; size 296 bytes  SHA-256 checksum f75231bde2a5515020baa696d5d51624c591914d8c9db5e12b78cf2fa7c328b1  Compiled from "Person.java"public class Person  minor version: 0  major version: 58  flags: (0x0021) ACC_PUBLIC, ACC_SUPER  this_class: #7                          // Person  super_class: #2                         // java/lang/Object  interfaces: 0, fields: 2, methods: 2, attributes: 1Constant pool:   #1 = Methodref          #2.#3          // java/lang/Object."
   
    ":()V   #2 = Class              #4             // java/lang/Object   #3 = NameAndType        #5:#6          // "
    
     ":()V   #4 = Utf8               java/lang/Object   #5 = Utf8               
     
         #6 = Utf8               ()V   #7 = Class              #8             // Person   #8 = Utf8               Person   #9 = Utf8               name  #10 = Utf8               Ljava/lang/String;  #11 = Utf8               age  #12 = Utf8               I  #13 = Utf8               Code  #14 = Utf8               LineNumberTable  #15 = Utf8               getAge  #16 = Utf8               (I)I  #17 = Utf8               SourceFile  #18 = Utf8               Person.java{  public java.lang.String name;    descriptor: Ljava/lang/String;    flags: (0x0001) ACC_PUBLIC  public Person();    descriptor: ()V    flags: (0x0001) 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  public int getAge(int);    descriptor: (I)I    flags: (0x0001) ACC_PUBLIC    Code:      stack=1, locals=2, args_size=2         0: iload_1         1: ireturn      LineNumberTable:        line 5: 0}SourceFile: "Person.java"C:\Users\FDDLC\Desktop\code>
      
     
    
   

当然，要想对上面的内容进行分析，那就涉及到Java汇编的知识。

附：Person.java

public class Person {    public String name;    private int age;//my comment    public int getAge(int age){        return age;    }}

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