Question

Nork individually or in pairs to write a simple "timer" dialog in Java. The dialog shall consist of three GUI components: a text field co display the elapse time in the hh:mm:ss format and start/stop puttons to start and stop the timer (see the lecture notes for sample screenshots). As suggested in the lecture notes, separate the model (TimerModel) From the view and control (TimerDialog) to make the model reusable. Ir Eact, you will reuse the model class when you create an Android version in the next lesson. Code it incrementally. P1*: GUI consisting of a text field and two buttons. Swing features: JLabel, JButton, and layout managers such as BorderLayout and FlowLayout P2: Logic for starting and stopping the timer and displaying the start/stop time. Swing features: Event, event handler and event registration ActionEvent, ActionListener, addActionListener long System.currentTimeMillies() P3: Display the elapsed time continuously, e.g., once per second Swing feature: single threadness To update the display periodically, use either the javax.swing. Timer class: Timer(int, ActionListener), start(), stop() or the Thread class and SwingUtilities.invokeLater (Runnable) *Use the provided base code; you can introduce a subclass or directly modify it. Submit your source code and sample screenshots. If done in pair, make only one submission and indicate it in your submission.

Answer 1

//JAVA COSDE TO COPY//

// importing required packages
import java.applet.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
  
public class Timer extends Applet implements Runnable, ActionListener {
  
// Panel to keep all the buttons and labels
Panel p;
Label display;
  
// Button
Button start, stop, reset;
  
// Time
int hour, minute, second, millisecond;
  
// string to be displayed on the label
String disp;
  
// State of stopwatch on/off
boolean on;
  
// initialization
public void init()
{
// initially off
on = false;
  
p = new Panel();
// Setting layout of the panel
p.setLayout(new GridLayout(4, 1, 6, 10));
  
// initial time 00 : 00 : 00 : 000
hour = minute = second = millisecond = 0;
  
// Label
display = new Label();
disp = "00 : 00 : 00 : 000";
display.setText(disp);
p.add(display);
  
// Start button
start = new Button("Start");
start.addActionListener((ActionListener) this);
p.add(start);
  
// Reset button
reset = new Button("Reset");
reset.addActionListener((ActionListener) this);
p.add(reset);
  
// Stop button
stop = new Button("Stop");
stop.addActionListener((ActionListener) this);
p.add(stop);
  
add(p);
  
// starting thread
new Thread(this, "StopWatch").start();
}
  
// Reset Function
// reset to default value
public void reset()
{
try {
Thread.sleep(1);
}
catch (Exception e) {
System.out.println(e);
}
hour = minute = second = millisecond = 0;
}
  
// update function
// update the timer
public void update()
{
millisecond++;
if (millisecond == 1000) {
millisecond = 0;
second++;
if (second == 60) {
second = 0;
minute++;
if (minute == 60) {
minute = 0;
hour++;
}
}
}
}
  
// changing label
public void changeLabel()
{
  
// Properly formatting the display of the timer
if (hour < 10)
disp = "0" + hour + " : ";
else
disp = hour + " : ";
  
if (minute < 10)
disp += "0" + minute + " : ";
else
disp += minute + " : ";
  
if (second < 10)
disp += "0" + second + " : ";
else
disp += second + " : ";
  
if (millisecond < 10)
disp += "00" + millisecond;
else if (millisecond < 100)
disp += "0" + millisecond;
else
disp += millisecond;
  
display.setText(disp);
}
  
// thread.run function
public void run()
{
  
// while the stopwatch is on
while (on) {
try {
// pause 1 millisecond
Thread.sleep(1);
// update the time
update();
// changeLabel
changeLabel();
}
catch (InterruptedException e) {
System.out.println(e);
}
}
}
  
// actionPerformed
// To listen to the actions on the buttons
public void actionPerformed(ActionEvent e)
{
  
// start a thread when start button is clicked
if (e.getSource() == start) {
// stopwatch is on
on = true;
new Thread(this, "StopWatch").start();
}
  
// reset
if (e.getSource() == reset) {
// stopwatch off
on = false;
reset();
changeLabel();
}
  
if (e.getSource() == stop) {
// stopwatch off
on = false;
}
}
}

//PROGRAM OUTPUT//

X Applet Viewer: test/Timer.class Applet 00:00:00:000 L Start Reset Stop Applet started

Applet Viewer: test/Timer.class Applet 00:00:01: 185 Start Reset Stop Applet started.

//EDITOR OUTPUT//

x х Test - NetBeans IDE 8.2 File Edit View Navigate Source Refactor Run Debug Profile Team Tools Window Help <default config> Q. Search (Ctrl+I) Source Files X Services - Test - build dist - nbproject - src .- test Timer.java - test applet.policy build.xml manifest.mf 11 output.txt Timer.java X History BE-979TD 71 IMPULCITY Icqucu Pacsayos 6 9 import java.applet.*; import java.awt.*; 8 import java.awt.event.ActionEvent; 9 import java.awt.event.ActionListener; 10 11 public class Timer extends Applet implements Runnable, ActionListener { 12 13 // Panel to keep all the buttons and labels 14 Panel p; 15 Label display; 16 17 // Button 18 Button start, stop, reset; 19 20 // Time 21 int hour, minute, second, millisecond; 22 23 // string to be displayed on the label 24 String disp; 25 26 // State of stopwatch on/off 27 boolean on; start - Navigator X Members update disp: String display : Label hour : int millisecond : int de minute : int up on : boolean Up: Panel preset: Button 27 second : int start: Button stop: Button

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