call method from another class in android

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http://stackoverflow.com – i have created two classes, actually both of them are an extends Activity what i am trying to do call a method from the second class what i am trying to do is calling the a method from second class then implemented in first class, unfortunately i did not success in that. i need your help to solve this problem. thank you my first class package com.math4kids; import android.app.Activity; import android.os.Bundle; public class testing002 extends Activity { private Sounds myotherclass; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated meth (HowTos)