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POStarting and Stopping a Thread-JButton Alignment
 

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  1. POStarting and Stopping a Thread-JButton Alignment
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    <p>I am trying to create a simple Timer with a Start Stop and Reset Button. I am new to using the Threads and ActionListeners. I have this working, and can get my timer to begin, and my button to change text from start to stop. But after that i am stuck. I need to stop the timer, and then start it again, if i press the start button. Then of course reset turns it back to zero. I do not want to use <code>java.util.Timer</code>, i just want to use threads. How would i get my thread once started, to pause and then resume. I tried using the built in methods, but i could not get it to compile right. </p> <pre><code>import javax.swing.*; import java.awt.Font; import java.lang.String; import java.awt.*; public class Timer extends JPanel { // Here are the fields from below! private static JLabel label = new JLabel(" 0.00 seconds"); private static javax.swing.JButton start = new javax.swing.JButton("Start"); private static javax.swing.JButton reset = new javax.swing.JButton("reset"); /** * Here is the Timer method- Begins with JLabel with medium alignment. */ public Timer() { //new Thread(this).start(); //label = new JLabel(" 0.00 Seconds"); //this.label = label; reset(); } /** * Here is the Reset method- pressing this button from below will * stop the thread and reset the text. */ public static void reset() { label.setFont(new Font("Arial",Font.BOLD,36)); label.setText(" 0.00 Seconds"); } public static void startStop() { //start.setText("stop"); //validate(); } public static void countDown() { int Msec=0,min=0,sec=0; while(sec &lt; 60) { label.setText(min+":"+sec+":"+Msec); //label.setLayout(new BorderLayout.CENTER); //label. Msec++; if(Msec==60) { Msec=0; sec++; //label.setText(min+":"+sec+":"+Msec); } if(sec ==60) { Msec =0; sec = 0; min++; } try { Thread.sleep(10); } catch(Exception e) {} } } public static void main(String [] args) { // we need a JFrame to put these elements into javax.swing.JFrame win = new javax.swing.JFrame("Timer"); // here we are instantating a new timer final Timer time = new Timer(); //Annonymous inner class start.addActionListener(new java.awt.event.ActionListener() { // here is the action performed method to start this. public void actionPerformed(java.awt.event.ActionEvent e) { //here we are creating a new thread to run throwable // every click creates a new Thread ( so it goes faster) String text = (String)e.getActionCommand(); if (text.equals("Start")){ start.setText("Stop"); } else{ start.setText("Start"); } Thread restart = new Thread(new Runnable() { public void run() { countDown(); //startStop(); } }); restart.start(); } }); //Look at the below abstract actionlistener below to get reset to work javax.swing.JButton reset = new javax.swing.JButton("reset"); // here we are creating a new annonomys inner class.... check the // curly braces reset.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent e) { Thread restart = new Thread(new Runnable() { public void run() { reset(); //Thread.stop(); } }); restart.destroy(); } }); //label.setVisible(true); javax.swing.JPanel tb = new javax.swing.JPanel(); tb.add(reset); tb.add(start); //tb.add(circle); win.add(tb,java.awt.BorderLayout.NORTH); win.setSize(300,300); //win.add(tb); win.add(label,java.awt.BorderLayout.CENTER); win.setDefaultCloseOperation(javax.swing.JFrame.DISPOSE_ON_CLOSE); // hiding inside setVisible is borderLayout win.setVisible(true); } } </code></pre>
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    1. USJason Braucht
    1. USCJ Powell
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      1. VTApproveEditSuggestion
    1. CO*"I am new to using .. ActiveListeners.."* What's that? People with big ears and good attention span?
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      1. POStarting and Stopping a Thread-JButton Alignment
      1. USAndrew Thompson
    2. CO"lol" actionListeners....
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      1. POStarting and Stopping a Thread-JButton Alignment
      1. USCJ Powell
    3. COIf you haven't already done so, you should read [Threads and Swing](http://java.sun.com/products/jfc/tsc/articles/threads/threads1.html) and [Concurrency in Swing](http://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html) for a good introduction to multi-threading and Swing.
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      1. POStarting and Stopping a Thread-JButton Alignment
      1. USJason Braucht
 

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