import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class GUI implements ActionListener {
	
	int count = 0;
	private JFrame frame;
	private JPanel panel;
	private JLabel label;
	
	
	//this public class is constructor.
	public GUI () {
		
		frame = new JFrame();
		
		JButton button = new JButton("Click me");
		button.addActionListener(this);
		
		label = new JLabel("Number of clicks:  0");
		
		
		panel = new JPanel();
		panel.setBorder(BorderFactory.createEmptyBorder(30, 30, 10, 30));
		panel.setLayout(new GridLayout(0, 1));
		panel.add(button);
		panel.add(label);
		
		
		frame.add(panel, BorderLayout.CENTER);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setBackground(new Color(0, 20, 100));
		frame.setTitle("First GUI");
		frame.pack();
		frame.setVisible(true);
		
		button.setBackground(new Color (25, 100, 100));
		button.setForeground(new Color (100, 25, 255));
		
		label.setForeground(new Color (0, 20, 25));
		
		
	}

	public static void main(String[] args) {
		new GUI();

	}

	//we use this to increase count number.
	@Override
	public void actionPerformed(ActionEvent e) {
		count ++;
		label.setText("Number of clicks: " + count);
		
	}

}