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POStopping a thread by a swing button
 

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    <p>I made a simple program which just tracks the co ordinates of the mouse cursor - it works fine, all I want do is start / stop it with a button.</p> <p>So far the button starts the thread well, what is the best way which I can safely stop the thread? This is because I may add a facility to write the coordinates to a text file in the future.</p> <p>Do I make a boolean which makes the thread run only when it is true or something like that? Because I tried to edit the trigger boolean but it had no affect what so ever.</p> <p>The code as it is : </p> <p>The class running the thread</p> <pre><code>public class tester { static int startTime = (int) System.currentTimeMillis(); static boolean trigger = false; static JLabel label = new JLabel(); static JLabel status = new JLabel(); static mouseLocate msl = new mouseLocate(); static JButton startButton = new JButton("Begin tracking"); static JButton stopButton = new JButton("Stop Tracker"); static Thread myThread = new Thread(new mouseLocate()); public static void main(String[] args) { JFrame frame = new JFrame("Mouse Grabber"); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(500, 100); JPanel panel = new JPanel(); frame.add(panel); panel.add(startButton); startButton.addActionListener(new startAction()); panel.add(label); panel.add(status); } static class startAction implements ActionListener { public void actionPerformed(ActionEvent e) { try { if (trigger == false) { trigger = true; msl.setTrigger(trigger); //label.setText("Trigger Active" + msl.isTrigger()); startButton.setText("Continue Tracking"); } else if (trigger == true) { trigger = false; //msl.setTrigger(trigger); label.setText("Trigger Inactive"); startButton.setText("Stop Tracking"); } } catch (Exception exp) { System.out.println("EXCEPTION CAUGHT " + e); } //RUN myThread.start(); } } </code></pre> <p>The mouse locate class:</p> <pre><code>public class mouseLocate implements Runnable { private boolean trigger = false; private int startTime = (int) System.currentTimeMillis(); static String status = ""; public void run() { int x, y; while (mouseGrabber.trigger = true) { try { PointerInfo mouseLocation = MouseInfo.getPointerInfo(); x = mouseLocation.getLocation().x; y = mouseLocation.getLocation().y; System.out.println("X:" + x + " Y:" + y + " Elapsed time: " + (((int) System.currentTimeMillis() - startTime) / 100)); } catch (Exception e) { System.out.println("Exception caught : " + e); } } } public int getStartTime() { return startTime; } public void setStartTime(int startTime) { this.startTime = startTime; } public boolean isTrigger() { return trigger; } public void setTrigger(boolean trigger) { this.trigger = trigger; } public static String getStatus() { return status; } public static void setStatus(String status) { mouseLocate.status = status; } </code></pre> <p>}</p> <p>Thank you for any help I really appreciate it.</p>
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    1. USalexeidebono
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    1. CO`while (mouseGrabber.trigger = true)` will always be true. You might want to write `while (mouseGrabber.trigger)`
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      1. USnkr
 

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