JVM method overload

gistfile1.java

package test;

import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Method;

import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;


public class Make implements Opcodes {
	public static void main(String[] args) {

		ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
		cw.visit(V1_1, ACC_PUBLIC, "test/Ov", null, "java/lang/Object", null);

		MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
				"<init>",
				"()V",
				null,
				null);
		mv.visitVarInsn(ALOAD, 0);
		mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
		mv.visitInsn(RETURN);
		mv.visitMaxs(1, 1);
		mv.visitEnd();

		mv = cw.visitMethod(ACC_PUBLIC, "a", "()I", null, null);
		mv.visitLdcInsn(Integer.valueOf(10));
		mv.visitInsn(IRETURN);
		mv.visitMaxs(0, 0);
		mv.visitEnd();

		mv = cw.visitMethod(ACC_PUBLIC, "a", "()Ljava/lang/String;", null, null);
		mv.visitLdcInsn("abc");
		mv.visitInsn(ARETURN);
		mv.visitMaxs(0, 0);
		mv.visitEnd();

		try {
			FileOutputStream out = new FileOutputStream("lib/test/Ov.class");
			out.write(cw.toByteArray());
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

class Run {
	public static void main(String[] args) throws Exception {
		Ov ov = new Ov();
		Method[] methods = ov.getClass().getDeclaredMethods();
		for (Method m : methods) {
			System.out.println(m);
			if (m.getName().equals("a")) {
				System.out.println(m.invoke(ov));
			}
		}
	}
}