java button applet program

import java.awt.*;
public class ButtonActionsTest extends java.applet.Applet {

public void init() {


setBackground(Color.white);
add(new Button("Red"));
add(new Button("Blue"));
add(new Button("Green"));
add(new Button("White"));
add(new Button("Black"));


}
public boolean action(Event evt, Object arg) {
if (evt.target instanceof Button)
changeColor((String)arg);
return true;
}
void changeColor(String bname) {
if (bname.equals("Red")) setBackground(Color.red);
else if (bname.equals("Blue")) setBackground(Color.blue);
else if (bname.equals("Green")) setBackground(Color.green);
else if (bname.equals("White")) setBackground(Color.white);
else setBackground(Color.black);
}
}