CIS 260 TThread0.java

Code

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


public class TThread0 extends JFrame {
    JButton btnStart, btnClear;
    JLabel lblNum;
    int count = 0;

    public static void main(String[] args) {
        TThread0 app = new TThread0();
        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 < 10000) {
            // 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));
        }
    }
}