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git-svn-id: http://anonsvn.jboss.org/repos/javassist/trunk@6 30ef5769-5b8d-40dd-aea6-55b5d6557bb3

1 files changed, 44 insertions, 0 deletions

diff --git a/sample/Test.java b/sample/Test.java
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index 00000000..0692943f
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+++ b/sample/Test.java
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+package sample;

+

+import javassist.*;

+

+/*

+   A very simple sample program

+

+   This program overwrites sample/Test.class (the class file of this

+   class itself) for adding a method g().  If the method g() is not

+   defined in class Test, then this program adds a copy of

+   f() to the class Test with name g().  Otherwise, this program does

+   not modify sample/Test.class at all.

+

+   To see the modified class definition, execute:

+

+   % javap sample.Test

+

+   after running this program.

+*/

+public class Test {

+    public int f(int i) {

+	return i + 1;

+    }

+

+    public static void main(String[] args) throws Exception {

+	ClassPool pool = ClassPool.getDefault(null);

+

+	CtClass cc = pool.get("sample.Test");

+	try {

+	    cc.getDeclaredMethod("g");

+	    System.out.println("g() is already defined in sample.Test.");

+	}

+	catch (NotFoundException e) {

+	    /* getDeclaredMethod() throws an exception if g()

+	     * is not defined in sample.Test.

+	     */

+	    CtMethod fMethod = cc.getDeclaredMethod("f");

+	    CtMethod gMethod = CtNewMethod.copy(fMethod, "g", cc, null);

+	    cc.addMethod(gMethod);

+	    pool.writeFile("sample.Test");	// update the class file

+	    System.out.println("g() was added.");

+	}

+    }

+}