package com.example;

import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Signal
{


	private static boolean label1Visible;
	private static boolean label2Visible;

	private static boolean label1SavedVisible;
	private static boolean label2SavedVisible;

	private static void saveAndResetLabelsState()
	{
		label1SavedVisible = label1Visible;
		label2SavedVisible = label2Visible;
		label1Visible = false;
		label2Visible = false;
	}

	public static void main(String[] args) throws IOException
	{
		JFrame frame = new JFrame();

		JPanel panel = new JPanel(){
			@Override
			public void paint(Graphics g){
				saveAndResetLabelsState();
				super.paint(g);
			}
		};



		JLabel label1 = new JLabel("first"){
			@Override
			public void paint(Graphics g){
				label1Visible = true;
				super.paint(g);
			}
		};
		JLabel label2 = new JLabel("second"){
			@Override
			public void paint(Graphics g){
				label2Visible = true;
				super.paint(g);
			}
		};
		JButton button = new JButton("areVisible?");
		button.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent e)
			{
				System.out.println("label1: " + label1SavedVisible);
				System.out.println("label2: " + label2SavedVisible);
			}

		});

		button.setLocation(50, 50);
		button.setSize(50, 50);

		label1.setLocation(0, 50);
		label2.setLocation(0, 250);

		label1.setSize(50, 50);
		label2.setSize(50, 50);

		panel.add(label1);
		panel.add(label2);
		panel.add(button);
		panel.setLocation(50, 50);
		panel.setLayout(null);

		frame.setSize(200, 200);
		frame.add(panel);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}