ClickCounterGUI.java

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

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class ClickCounterGUI extends JFrame implements ActionListener
{

    private JTextField tf1 = new JTextField("Clicked 0 time(s).", 15);
    private JTextField tf2 = new JTextField("Copied text here.", 15);
    private JButton b1;
    private JButton b2;
    private JButton b3;
    private int numClicks = 0;

    private String b1Text = "Click the button to increment the counter.";
    private String b2Text = "Clear contents of both text fields.";
    private String b3Text = "Copy contents of first text field to second text field.";

    ClickCounterGUI()
    {
        b1 = new JButton("Click Me!");
        b2 = new JButton("Clear");
        b3 = new JButton("Copy");
        b1.addActionListener(this);
        b2.addActionListener(this);
        b3.addActionListener(this);
        b1.setToolTipText(b1Text);
        b2.setToolTipText(b2Text);
        b3.setToolTipText(b3Text);
        add(b1);
        add(b2);
        add(b3);
        add(tf1);
        add(tf2);
        setSize(250, 400);
        setLayout(new GridLayout(5, 0));
        setTitle("Click Counter GUI");
        tf1.setBackground(Color.PINK);
        tf1.setForeground(Color.BLACK);
        tf2.setBackground(Color.MAGENTA);
        tf2.setForeground(Color.BLACK);
        tf1.setEditable(false);
        setResizable(false);
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e)
    {
        if (e.getActionCommand().equals("Click Me!"))
        {
            numClicks++;
            tf1.setText("Clicked " + numClicks + " time(s).");
        }
        else if (e.getActionCommand().equals("Clear"))
        {
            numClicks = 0;
            tf1.setText("");
            tf2.setText("");
        }
        else if (e.getActionCommand().equals("Copy"))
        {
            tf2.setText(""+tf1.getText());
        }
    }
}