Button b1 = new Button("Button 1");
Button b2 = new Button("Button 2");
public void init() {
    add(b1);
    add(b2);
}

public boolean action(Event evt, Object obj) {
    if (evt.target.equals(b1)) {
	    System.out.println("Button 1 pressed");
	    return true;
    } else if (evt.target.equals(b2)) {
	    System.out.println("Button 2 pressed");
	    return true;
    } else {
	    return super.action(evt,obj);
    }
}

Source