Java Tools Tutorials - Herong's Tutorial Examples - v6.23, by Herong Yang
javap - Listing Public Variables and Methods
This section provides a tutorial example of how to list all public variables and methods of a class with 'javap' without any options.
In order to test the Java disassembler tool, I wrote this simple Java application file, Circle.java:
/* Circle.java * Copyright (c) 2005 HerongYang.com. All Rights Reserved. */ public class Circle { public String uom = "Centimeter"; private int x = 0; private int y = 0; private int r = 1; public void setRadius(int radius) { r = radius; } public void setCenter(int centerX, int centerY) { x = centerX; y = centerY; } public void printRadius() { System.out.println(r + " " + uom); } public void printArea() { double area = getArea(); System.out.println(area + " " + uom + "^2"); } private double getArea() { return 3.14159*r*r; } }
To test "javap", we need to compile this source code file into a bytecode class file, Circle.class:
herong> javac Circle.java herong> dir Circle.* 1,393 Circle.class 610 Circle.java
Now we can see what "javap" will do for us on this bytecode class file:
herong> javap Circle Compiled from "Circle.java" public class Circle extends java.lang.Object{ public java.lang.String uom; public Circle(); public void setRadius(int); public void setCenter(int, int); public void printRadius(); public void printArea(); }
Very nice. By default, "javap" print a list of all public variables and methods.
Table of Contents
javac - The Java Program Compiler
java - The Java Program Launcher
jpackage - Binary Package Builder
javadoc - The Java Document Generator
jdeps - The Java Class Dependency Analyzer
jdeprscan - The Java Deprecated API Scanner
jcmd - The JVM Diagnostic Tool
jconsole - Java Monitoring and Management Console
jstat - JVM Statistics Monitoring Tool
jhsdb - The Java HotSpot Debugger
jvisualvm (Java VisualVM) - JVM Visual Tool
►javap - The Java Class File Disassembler
javap - Java Disassembler Command and Options
►javap - Listing Public Variables and Methods
"javap -private" - Listing Private Variables and Methods
"javap -c -private" - Disassembling Java Bytecode Class
Looking Up Method Signature with javap Command
keytool - Public Key Certificate Tool
jrunscript - Script Code Shell
native2ascii - Native-to-ASCII Encoding Converter