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"javap" - Dedault Output
What Is the default output of the "javap" Command?
✍: FYIcenter
The default output of the "javap" command
presents the interface information of the Java class stored
in the given bytecode.
1. Create a Java class, HelloWorldFrame.java, with the following source code,
import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class HelloWorldFrame extends JFrame { String message = "Hello World!"; public HelloWorldFrame(){ setContentPane(new JPanel(){ @Override protected void paintComponent(Graphics g) { g.drawString(message, 15, 30); } }); setSize(100, 100); } public static void main(String[] args) { HelloWorldFrame frame = new HelloWorldFrame(); frame.setVisible(true); } }
2. Compile it into a bytecode file, HelloWorldFrame.class:
> javac HelloWorldFrame.java
3. Disassemble it using "javap" command with default options
> javap HelloWorldFrame.class Compiled from "HelloWorldFrame.java" public class HelloWorldFrame extends javax.swing.JFrame { java.lang.String message; public HelloWorldFrame(); public static void main(java.lang.String[]); }
2021-08-21, 496👍, 0💬
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