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I know that this Question is repeated but I can't find the answer in the Internet. I want to call a method from another class. I have Class1 and Class2. In Class 2 I have this method: public void UpdateEmployee(){ //some code } I want to call the above method from Class1. Thanks for any answer. ----EDIT---- final Button btnUpdate = (Button)findViewById(R.id.btnUpd); btnUpdate.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Employee updEmple = new Employee(); updEmple.UpdateEmployee(); } }); ----LogCat--- 05-28 16:30:44.030: E/AndroidRuntime(25198): FATAL EXCEPTION: main 05-28 16:30:44.030: E/AndroidRuntime(25198): java.lang.NullPointerException: println needs a message 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.util.Log.println_native(Native Method) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.util.Log.v(Log.java:116) 05-28 16:30:44.030: E/AndroidRuntime(25198): at and.net.Employee.UpdateEmployee(Employee.java:77) 05-28 16:30:44.030: E/AndroidRuntime(25198): at and.net.AndActivity$2.onClick(AndActivity.java:51) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.view.View.performClick(View.java:2485) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.view.View$PerformClick.run(View.java:9080) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.os.Handler.handleCallback(Handler.java:587) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.os.Handler.dispatchMessage(Handler.java:92) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.os.Looper.loop(Looper.java:123) 05-28 16:30:44.030: E/AndroidRuntime(25198): at android.app.ActivityThread.main(ActivityThread.java:3683) 05-28 16:30:44.030: E/AndroidRuntime(25198): at java.lang.reflect.Method.invokeNative(Native Method) 05-2

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