Example of WAIT and CONTINUE using checkBox and thread and getTreeLock()

Question

I had so much trouble with this that I descided to
post if incase it helps someone else
// Swing Applet example of WAIT and CONTINUE using checkBox and thread and getTreeLock()
// Runs form dos window
// When START button is pressed program increments x and displys it as a JLabel
// When checkBox WAIT is ticked program waits.
// When checkBox WAIT is unticked program continues.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;
public class Wc extends JApplet {
Display canvas;//drawing surface is displayed.
Box buttonPanel;
Box msgArea;
public static JButton button[] = new JButton [2];
public static JCheckBox checkBox[] = new JCheckBox[2];
public static JLabel msg[] = new JLabel [2];
String[] buttonDesc ={"Start","Quit"};
public static final int buttonStart = 0;
public static final int buttonQuit = 1;
String[] checkBoxDesc ={"Wait"};     
public static final int checkBoxWait = 0;
public boolean wait;
public Graphics g;
//================================================================
public static void main(String[] args){
Frame f = new Frame();
JApplet a = new Wc();
f.add(a, "Center"); // Add applet to window
a.init(); // Initialize the applet
f.setSize(300,100); // Set the size of the window
f.show(); // Make the window visible
f.addWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent e){System.exit(0);}
}// end main
//===================================================
public void init() {
canvas = new Display();
setBackground(Color.black);
getContentPane().setLayout(new BorderLayout(3,3));
getContentPane().add(canvas, BorderLayout.CENTER);
buttonPanel = Box.createHorizontalBox();
getContentPane().add(buttonPanel, BorderLayout.NORTH);
int sbZ;
// add button
button[0] = new JButton(buttonDesc[0]);
button[0].addActionListener(canvas);
buttonPanel.add(button[0]);
button[1] = new JButton(buttonDesc[1]);
button[1].addActionListener(canvas);
buttonPanel.add(button[1]);
// add checkBox
sbZ=0;
checkBox[sbZ]=new JCheckBox(checkBoxDesc[sbZ]);
checkBox[sbZ].setBackground(Color.white);
checkBox[sbZ].setOpaque(true);
checkBox[sbZ].addActionListener(canvas);
buttonPanel.add(checkBox[sbZ]);
msgArea = Box.createVerticalBox(); // add message
sbZ=0;
msg[sbZ]=new JLabel("1",JLabel.LEFT);
msg[sbZ].setOpaque(true);
msg[sbZ].setBackground(Color.black);
msg[sbZ].setForeground(Color.red);
msgArea.add(msg[sbZ]);
getContentPane().add(msgArea, BorderLayout.SOUTH);
} // end init();
//===================================================
public void stop(){canvas.stopRunning();}
//===================================================
// The following nested class represents the drawing surface
// of the applet and also does all the work.
class Display extends JPanel implements ActionListener, Runnable {
Image OSI;
Graphics OSG; // A graphics context for drawing on OSI.
Thread runner; // A thread to do the computation.
boolean running; // Set to true when the thread is running.
public void paintComponent(Graphics g) {
if (OSI == null) {
g.setColor(Color.black);
g.fillRect(0,0,getWidth(),getHeight());
else {g.drawImage(OSI,0,0,null);}
}//paintComponent
public void actionPerformed(ActionEvent evt) {
String command = evt.getActionCommand();
if (command.equals(buttonDesc[buttonStart])) {
startRunning();
if (command.equals(buttonDesc[buttonQuit])) {
stopRunning();
if (command.equals(checkBoxDesc[checkBoxWait])){
System.out.println("cb");
if (checkBox[checkBoxWait].isSelected() ) {
wait = true;
System.out.println("cb selected twait "+wait);
return;
wait = false;
synchronized(getTreeLock()) {getTreeLock().notifyAll();}
System.out.println("cb selected fwait "+wait);
} // end command.equal cb wait
} //end action performed
// A method that starts the thread unless it is already running.
void startRunning() {
if (running)return;
// Create a thread that will execute run() in this Display class.
runner = new Thread(this);
running = true;
runner.start();
} //end startRunning
void stopRunning() {running = false;System.exit(0);}
public void run() {
button[buttonStart].setEnabled(false);
int x;
x=1;
while(x>0 && running){
x = x + 1;
msg[0].setText(""+x);
try{SwingUtilities.invokeAndWait(painter);}catch(Exception e){}
//importand dont put this in actionPerformed
if (wait) {
System.out.println("run "+wait);
synchronized(getTreeLock()) {
while(wait) {
System.out.println("while "+wait);
try {getTreeLock().wait();} catch(Exception e){break;}
} //end while(wait)
} // end sync
} // end if(wait)
} // endwhile(x>0)
stopRunning();
} // end run()
Runnable painter = new Runnable() {
public void run() {
Dimension dim = msg[0].getSize();
msg[0].paintImmediately(0,0,dim.width,dim.height);
Thread.yield();
}//end run in painter
} ; //end painter
} //end nested class Display
} //end class Wc

Answer 1

I just encountered a similar issue.  I bought a new iPhone5s and sent my iPhone4s for recycling as it was in great shape, no scratches, no breaks, perfect condition.  I expected $200 and received an email that I would only receive $24.12.  The explanation was as follows:  Phone does not power on - Power Supply Error.   Attempts to discuss don't seem to get past a customer service rep that can only "escalate" my concern.  They said I would receive a response, but by email.  After 4 days no response.  There is something seriously wrong with the technical ability of those in the recycling center.