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POCounter to Close JFrame, bring up Confirm Dialog
 

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    <p>This post relates to my last one regarding a timer. I decided the easiest thing to do for immediate results was to just write a Counter thread that counts down from a certain time (in this case 5 seconds) and if the counter reaches 0, the JFrame closes and let's the user know that time has expired. </p> <p>I'm running into some trouble, however. I cannot seem to make the JFrame close when the counter reaches 0. I'm not sure if I'm missing something stupid or if I am misunderstanding the way threads work and the way JFrames work. Here is the code, let me know what you think.</p> <p>On a side note, I understand it would probably be most efficient to use a swing.Timer, but I just don't quite grasp the nature of them yet. I'm under self-imposed time constraints (I'm not a student or anything, I just like to stay motivated) and so I'm "jerry-rigging" this thing for now.</p> <p>Anyway, on to the code!</p> <pre><code>import javax.swing.*; import javax.swing.event.*; import java.awt.*; public class RacerDoom extends JFrame { boolean timesUp=false; public RacerDoom() { //create JFrame super("Racer Doom Squared"); setSize(WIDTH,HEIGHT); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); if(timesUp==true) { dispose(); JOptionPane.showConfirmDialog(null, "Time's Up! Click Okay to try again!"); } Counter c1 = new Counter(); c1.start(); //Counter private class Counter extends Thread { public Counter() {} public void run() { for(int i=5;i&gt;=0;i--) { if(i==0) { timesUp=true; } System.out.println(i); try{ Thread.sleep(1000); } catch(InterruptedException e){} } } } ... </code></pre> <p>EDIT: I have the timer implemented and working. It does exactly what I need it to, but I can't get the <code>timer.stop();</code> command to work. I get the error "The local variable timer may not have been initialized.</p> <p>Like I said, the timer works, it just never stops working until the program is terminated. Here is the constructor code for the JFrame, where the timer is located.</p> <pre><code>int counter = 0; public RacerDoom() { //create JFrame super("Racer Doom Squared"); setSize(WIDTH,HEIGHT); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); final Timer timer=new Timer(1000, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if(counter&gt;=10) { timer.stop(); //the error occurs here dispose(); JOptionPane.showConfirmDialog(null, "Time's Up!"); } else{ counter++; } System.out.println(counter); } }); //inner thread Move1 m1 = new Move1(); m1.start(); timer.start(); } </code></pre>
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    1. COWhy close a JFrame? Why not simply stop the game, perhaps fade to black or show a different view? Having JFrames pop in and out seems a bit sketchy to me.
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    2. COThat is something I plan on implementing. I'm teaching myself Java one step at a time so I like to get simple results and expand them to more complex ones only after I fully understand the basics.
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    3. COIt looks like the `if(timesUp==true)` code is sitting in the constructor, which only is run once, at the initialisation of the jFrame. @sethu's answer is the best way to handle this. It might also be worth looking into the concept of a `game loop` for how to handle these sorts of things.
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