public class FormLogin {
	LoginListener listener;
	public FormLogin(LoginListener parent, Display display) {
		listener = parent;
	}

	public someMethod() {
		listener.someEvent();
		listener.loginSuccess();
	}
}

public interface LoginListener {
	public void someEvent();
	public void loginSuccess();	
}

public class Parent extends Midlet implements LoginListener {
	Display disp;

	public Parent() {
		FormLogin frmLogin = new FormLogin(this, disp);
	}

	public void someEvent() {
		//implement your method here
	}

	public void loginSuccess() {
		//implement your method here
	}
}