這篇文章將為大家詳細(xì)講解有關(guān)如何查看java中.class文件,小編覺(jué)得挺實(shí)用的,因此分享給大家做個(gè)參考,希望大家閱讀完這篇文章后可以有所收獲。
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有時(shí)候?yàn)榱搜芯縅avac的原理,要去看看class文件的內(nèi)容是如何組織的,這時(shí)候很有必要查看class文件。
java class文件怎么看?
查看class文件方法有很多種,這里推薦使用JDK自帶的javap工具。
首先建立如下源碼:
public class HelloWorld{ public static void main(String[] args){ System.out.println("hello world!"); } }
使用javac編譯器把源文件編譯好,再接著使用javap工具查看class文件,命令如下
javap -verbose HelloWorld
這是DOS窗口的運(yùn)行結(jié)果復(fù)制出來(lái)如下圖:
F:\>javac HelloWorld.java F:\>javap -verbose HelloWorld Classfile /F:/HelloWorld.class Last modified 2017-12-24; size 426 bytes MD5 checksum 4efac412ef483c8a3fe7489c87d15c8c Compiled from "HelloWorld.java" public class HelloWorld minor version: 0 major version: 52 flags: ACC_PUBLIC, ACC_SUPER Constant pool: #1 = Methodref #6.#15 // java/lang/Object."":()V #2 = Fieldref #16.#17 // java/lang/System.out:Ljava/io/Print Stream; #3 = String #18 // hello world! #4 = Methodref #19.#20 // java/io/PrintStream.println:(Ljava/ lang/String;)V #5 = Class #21 // HelloWorld #6 = Class #22 // java/lang/Object #7 = Utf8 #8 = Utf8 ()V #9 = Utf8 Code #10 = Utf8 LineNumberTable #11 = Utf8 main #12 = Utf8 ([Ljava/lang/String;)V #13 = Utf8 SourceFile #14 = Utf8 HelloWorld.java #15 = NameAndType #7:#8 // " ":()V #16 = Class #23 // java/lang/System #17 = NameAndType #24:#25 // out:Ljava/io/PrintStream; #18 = Utf8 hello world! #19 = Class #26 // java/io/PrintStream #20 = NameAndType #27:#28 // println:(Ljava/lang/String;)V #21 = Utf8 HelloWorld #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 HelloWorld(); descriptor: ()V flags: 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 static void main(java.lang.String[]); descriptor: ([Ljava/lang/String;)V flags: ACC_PUBLIC, ACC_STATIC Code: stack=2, locals=1, args_size=1 0: getstatic #2 // Field java/lang/System.out:Ljav a/io/PrintStream; 3: ldc #3 // String hello world! 5: invokevirtual #4 // Method java/io/PrintStream.prin tln:(Ljava/lang/String;)V 8: return LineNumberTable: line 3: 0 line 4: 8 } SourceFile: "HelloWorld.java" F:\>
關(guān)于如何查看java中.class文件就分享到這里了,希望以上內(nèi)容可以對(duì)大家有一定的幫助,可以學(xué)到更多知識(shí)。如果覺(jué)得文章不錯(cuò),可以把它分享出去讓更多的人看到。