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Thread: wait(); and notify();

  1. #1
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    Default wait(); and notify();

    How come my program stays in the wait(); state on line 74 and never moves on I have to manually exit the application. Here is my code
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.util.Arrays;
    import java.util.*;
    import java.util.concurrent.locks.*;
    import java.io.*;
    import java.util.Random;
    import java.beans.*;
    import javax.swing.border.Border;
    import javax.swing.ImageIcon;
     
    public class PatchIt extends JFrame
    {
     
       private JButton SCCM;
       private JButton Patches;
       private JButton Start;
       private JButton Exit;
       private ImageIcon logo;
       private JLabel icon;
       private JProgressBar progress = new JProgressBar();
       private int sleepTime;
       private boolean isReady = true;
       private final static Random generator = new Random();
     
       public PatchIt()
       {
          super("Patch It UP       By SrA Aaron Horan & SSgt Christopher Barrow");
                 setLayout(new FlowLayout());
     
     
          logo = new ImageIcon("bisstrip.jpg");
     
          icon = new JLabel (logo);
     
          SCCM = new JButton("SCCM");
          SCCM.setToolTipText("This button will uninstall and reinstall Configuration manager");
     
          Patches = new JButton("Patches");
     
          sleepTime = generator.nextInt( 180000 );
     
          add(SCCM, BorderLayout.NORTH);
     
          add(icon, BorderLayout.CENTER );
     
          add(Patches, BorderLayout.SOUTH);
     
     
     
     
          ButtonHandler handler = new ButtonHandler();
     
          SCCM.addActionListener(handler);
     
     
     
       }
       private class ButtonHandler implements ActionListener
    	{
    		public void actionPerformed(ActionEvent event)  
          {
             if(event.getSource() == SCCM)
             {
                synchronized(this)
                {
                   try
                   {
     
                      Process EL = Runtime.getRuntime().exec("wscript C:\\Users\\1293714939A\\Desktop\\UAC.vbs");
                         try
                         {
                               wait();
     
                         }
                         catch (InterruptedException exception )
                         {
                         }
                   }
                   catch (IOException b)
                   {
                      b.printStackTrace();
                   }
                }
                synchronized(this)
                {
                   try
                   {
                      Process B = Runtime.getRuntime().exec("wscript C:\\Users\\1293714939A\\Desktop\\calctest.vbe");
                         notify();
                   }
                   catch (IOException b)
                   {
                      b.printStackTrace();
                   }
                }
              }
            }
          }
     
       public static void main (String [] args)
       {
     
     
          PatchIt run = new PatchIt();
          run.setSize(950,780);
          run.setVisible(true);
          run.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
     
       }
     
    }
    Last edited by helloworld922; August 14th, 2013 at 05:14 PM. Reason: please use [code] tags


  2. #2
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    Default Re: wait(); and notify();

    Please post your code in code tags.

    Empty catch() {} blocks are useless and a bad practice. Fix that.

    What is the wait() statement waiting for, and while it's waiting, what could possibly send a notify()? In other words, are multiple threads running independently, one waiting and one able to call notify()?

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