想研究java的class的小伙伴注意了。

查看.class文件內容--javap指令

用到的指令是

javap -verbose 目標.class

文末給出了批處理腳本

首先我們看：

一個簡易的輸出功能的class中是這樣的：

Classfile /C:/Users/Administrator/Desktop/test/Test.classLast modified 2020-4-16; size 416 bytesMD5 checksum f74e6ac2f6f8931a2c9bccd76cc3c008Compiled from "Test.java" public class Testminor version: 0major version: 52flags: ACC_PUBLIC, ACC_SUPER Constant pool:#1 = Methodref #6.#15 // java/lang/Object."<init>":()V#2 = Fieldref #16.#17 // java/lang/System.out:Ljava/io/PrintStream;#3 = String #18 // test OK--java1#4 = Methodref #19.#20 // java/io/PrintStream.println:(Ljava/lang/String;)V#5 = Class #21 // Test#6 = Class #22 // java/lang/Object#7 = Utf8 <init>#8 = Utf8 ()V#9 = Utf8 Code#10 = Utf8 LineNumberTable #11 = Utf8 main#12 = Utf8 ([Ljava/lang/String;)V #13 = Utf8 SourceFile#14 = Utf8 Test.java#15 = NameAndType #7:#8 // "<init>":()V #16 = Class #23 // java/lang/System#17 = NameAndType #24:#25 // out:Ljava/io/PrintStream; #18 = Utf8 test OK--java1#19 = Class #26 // java/io/PrintStream#20 = NameAndType #27:#28 // println:(Ljava/lang/String;)V #21 = Utf8 Test#22 = Utf8 java/lang/Object #23 = Utf8 java/lang/System#24 = Utf8 out#25 = Utf8 Ljava/io/PrintStream;#26 = Utf8 java/io/PrintStream#27 = Utf8 println#28 = Utf8 (Ljava/lang/String;)V {public Test();descriptor: ()Vflags: ACC_PUBLICCode:stack=1, locals=1, args_size=10: aload_01: invokespecial #1 // Method java/lang/Object."<init>":()V4: returnLineNumberTable:line 2: 0public static void main(java.lang.String[]);descriptor: ([Ljava/lang/String;)Vflags: ACC_PUBLIC, ACC_STATICCode:stack=2, locals=1, args_size=10: getstatic #2 // Field java/lang/System.out:Ljava/io/PrintStream;3: ldc #3 // String test OK--java15: invokevirtual #4 // Method java/io/PrintStream.println:(Ljava/lang/String;)V8: returnLineNumberTable:line 5: 0line 6: 8 } SourceFile: "Test.java"

我給大家提供一個windows環境下的批處理腳本：

::@author joker ::@description javap -verbose查看java--class ::@date 2020-4-16 9:17 echo 輸入目標文件的路徑（不含文件后綴.class） set /p jclasspath=javap -verbose %jclasspath%.classpause

雙擊輸入路徑就可以看到了
效果如下：

完結。

總結

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