CIS 260 TThread1.java

Code

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;


public class TThread1 extends JFrame {
    JButton btnStart, btnClear;
    JLabel lblNum;
    int count = 0;

    public static void main(String[] args) {
        TThread1 app = new TThread1();
        app.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        app.init();
        app.pack();
        app.setVisible(true);
    }

    public void init() {
        Container c = this.getContentPane();
        c.setLayout(new GridLayout(3,1));
        lblNum = new JLabel("Running Total");
        btnStart = new JButton("Start");
        btnClear = new JButton("Clear");
        btnClear.setEnabled(false);

        btnStart.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                btnStart.setEnabled(false);
                btnClear.setEnabled(true);
                doCount();   
            }
        });

        btnClear.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                count = 0;
                lblNum.setText(Integer.toString(count++));
                btnStart.setEnabled(true);
                btnClear.setEnabled(false);
            }
        });

        c.add(lblNum);
        c.add(btnStart);
        c.add(btnClear);
    }

    private void doCount() {
        while (count < 100) {
            // next line not reflected until end
            lblNum.setText(Integer.toString(count++));
            // the following line is used to show activity
            System.out.println(Integer.toString(count));
            // attempting to correct problem with sleep()
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                System.out.println("Application Interrupted");
            }
        }
    }
}