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"javap -c" - Generate Assembler Instructions
How to disassembles bytecode of a Java class into assembler instructions.
✍: FYIcenter
If you want to disassemble bytecode of a Java class into assembler instructions, you can use the "javap" command with the "-c" option.
1. Compile HelloWorldFrame.java used in the last tutorial into a bytecode file, HelloWorldFrame.class:
> javac HelloWorldFrame.java
2. Disassemble it using "javap" command with the "-c" option
> javap -c HelloWorldFrame.class Compiled from "HelloWorldFrame.java" public class HelloWorldFrame extends javax.swing.JFrame { java.lang.String message; public HelloWorldFrame(); Code: 0: aload_0 1: invokespecial #1 // Method javax/swing/JFrame."<init>":()V 4: aload_0 5: ldc #7 // String Hello World! 7: putfield #9 // Field message:Ljava/lang/String; 10: aload_0 11: new #15 // class HelloWorldFrame$1 14: dup 15: aload_0 16: invokespecial #17 // Method HelloWorldFrame$1."<init>":(LHelloWorldFrame;)V 19: invokevirtual #20 // Method setContentPane:(Ljava/awt/Container;)V 22: aload_0 23: bipush 100 25: bipush 100 27: invokevirtual #24 // Method setSize:(II)V 30: return public static void main(java.lang.String[]); Code: 0: new #10 // class HelloWorldFrame 3: dup 4: invokespecial #28 // Method "<init>":()V 7: astore_1 8: aload_1 9: iconst_1 10: invokevirtual #29 // Method setVisible:(Z)V 13: return }
2021-08-21, 647🔥, 0💬
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