进度条问题ProgressMonitor
import java.awt.Button;import javax.swing.JFrame;import javax.swing.ProgressMonitor;public class Progress extends JFrame { private ProgressMonitor pm = new ProgressMonitor(this,"Monitoring Progress","Test",0,100); Button but = new Button("点击"); public Progress(){ pm.setProgress(0); pm.setMillisToPopup(1000); this.add(but); but.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { for(int i = 0;i<101;i++){//设置断点，一步一步循环 pm.setProgress(i); } } }); this.setSize(300,200); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true); } public static void main(String[] args) { new Progress(); } }
task.go();
timer.start();
}
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("ProgressMonitorDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new ProgressMonitorDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
abstract class SwingWorker {
private Object value; // see getValue(), setValue()
private static class ThreadVar {
private Thread thread;
ThreadVar(Thread t) { thread = t; }
synchronized Thread get() { return thread; }
synchronized void clear() { thread = null; }
}
private ThreadVar threadVar;
/**
* Get the value produced by the worker thread, or null if it
* hasn't been constructed yet.
*/
protected synchronized Object getValue() {
return value;
}
/**
* Set the value produced by worker thread
*/
private synchronized void setValue(Object x) {
value = x;
}
public abstract Object construct();
/**
* Called on the event dispatching thread (not on the worker thread)
* after the <code>construct</code> method has returned.
*/
public void finished() {
}
public void interrupt() {
Thread t = threadVar.get();
if (t != null) {
t.interrupt();
}
threadVar.clear();
}
public Object get() {
while (true) {
Thread t = threadVar.get();
if (t == null) {
return getValue();
}
try {
t.join();
}
catch (InterruptedException e) {
Thread.currentThread().interrupt(); // propagate
return null;
}
}
}
/**
* Start a thread that will call the <code>construct</code> method
* and then exit.
*/
public SwingWorker() {
final Runnable doFinished = new Runnable() {
public void run() { finished(); }
};
Runnable doConstruct = new Runnable() {
public void run() {
try {
setValue(construct());
}
finally {
threadVar.clear();
}
SwingUtilities.invokeLater(doFinished);
}
};
Thread t = new Thread(doConstruct);
threadVar = new ThreadVar(t);
}
/**
* Start the worker thread.
*/
public void start() {
Thread t = threadVar.get();
if (t != null) {
t.start();
}
}
}
class LongTask {
private int lengthOfTask;
private int current = 0;
private boolean done = false;
private boolean canceled = false;
private String statMessage;
public LongTask() {
//Compute length of task...
//In a real program, this would figure out
//the number of bytes to read or whatever.
lengthOfTask = 1000;
}
/**
* Called from ProgressBarDemo to start the task.
*/
public void go() {
final SwingWorker worker = new SwingWorker() {
public Object construct() {
current = 0;
done = false;
canceled = false;
statMessage = null;
return new ActualTask();
}
};
worker.start();
}
/**
* Called from ProgressBarDemo to find out how much work needs
* to be done.
*/
public int getLengthOfTask() {
return lengthOfTask;
}
/**
* Called from ProgressBarDemo to find out how much has been done.
*/
public int getCurrent() {
return current;
}
public void stop() {
canceled = true;
statMessage = null;
}
/**
* Called from ProgressBarDemo to find out if the task has completed.
*/
public boolean isDone() {
return done;
}
/**
* Returns the most recent status message, or null
* if there is no current status message.
*/
public String getMessage() {
return statMessage;
}
/**
* The actual long running task. This runs in a SwingWorker thread.
*/
class ActualTask {
ActualTask() {
//Fake a long task,
//making a random amount of progress every second.
while (!canceled && !done) {
try {
Thread.sleep(1000); //sleep for a second
current += Math.random() * 100; //make some progress
if (current >= lengthOfTask) {
done = true;
current = lengthOfTask;
}
statMessage = "Completed " + current +
" out of " + lengthOfTask + ".";
} catch (InterruptedException e) {
System.out.println("ActualTask interrupted");
}
}
}
}
}
[解决办法]
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