Java Active

ممكن ان توضح اكثر , لان المطلوب غير مفهوم

exp

for (int i =0;i<=100;i++){

jtext.settext(i+"");

|}

اريد القيمة داخل التيكست تتغير اثناء عمل الفور وليس بعد انتهاء الفور

شغل التكرار في خيط منفصل عن الخيط الرئيسي

واجعل بين كل عملية setText والأخرى مسافة زمنية بمقدار معين لنقل نصف ثانية

وسيعمل معاك بشكل جيد

تحياتي

هذا هو الحل وقد عمل بشكل رائع

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/*
 * ProgressBarDemo.java is a 1.4 application that requires these files:
 *   LongTask.java
 *   SwingWorker.java
 */
public class ProgressBarDemo extends JPanel
							 implements ActionListener {
	public final static int ONE_SECOND = 1000;

	private JProgressBar progressBar;
	private Timer timer;
	private JButton startButton;
	private LongTask task;
	private JTextArea taskOutput;
	private String newline = "\n";

	public ProgressBarDemo() {
		super(new BorderLayout());
		task = new LongTask();

		//Create the demo's UI.
		startButton = new JButton("Start");
		startButton.setActionCommand("start");
		startButton.addActionListener(this);

		progressBar = new JProgressBar(0, task.getLengthOfTask());
		progressBar.setValue(0);
		progressBar.setStringPainted(true);

		taskOutput = new JTextArea(5, 20);
		taskOutput.setMargin(new Insets(5,5,5,5));
		taskOutput.setEditable(false);
		taskOutput.setCursor(null); //inherit the panel's cursor
									//see bug 4851758

		JPanel panel = new JPanel();
		panel.add(startButton);
		panel.add(progressBar);

		add(panel, BorderLayout.PAGE_START);
		add(new JScrollPane(taskOutput), BorderLayout.CENTER);
		setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));

		//Create a timer.
		timer = new Timer(ONE_SECOND, new ActionListener() {
			public void actionPerformed(ActionEvent evt) {
				progressBar.setValue(task.getCurrent());
				String s = task.getMessage();
				if (s != null) {
					taskOutput.append(s + newline);
					taskOutput.setCaretPosition(
							taskOutput.getDocument().getLength());
				}
				if (task.isDone()) {
					Toolkit.getDefaultToolkit().beep();
					timer.stop();
					startButton.setEnabled(true);
					setCursor(null); //turn off the wait cursor
					progressBar.setValue(progressBar.getMinimum());
				}
			}
		});
	}

	/**
	 * Called when the user presses the start button.
	 */
	public void actionPerformed(ActionEvent evt) {
		startButton.setEnabled(false);
		setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
		task.go();
		timer.start();
	}

	/**
	 * Create the GUI and show it.  For thread safety,
	 * this method should be invoked from the
	 * event-dispatching thread.
	 */
	private static void createAndShowGUI() {
		//Make sure we have nice window decorations.
		JFrame.setDefaultLookAndFeelDecorated(true);

		//Create and set up the window.
		JFrame frame = new JFrame("ProgressBarDemo");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		//Create and set up the content pane.
		JComponent newContentPane = new ProgressBarDemo();
		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();
			}
		});
	}
}
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");
				}
			}
		}
	}
}
/**
 * This is the 3rd version of SwingWorker (also known as
 * SwingWorker 3), an abstract class that you subclass to
 * perform GUI-related work in a dedicated thread.  For
 * instructions on and examples of using this class, see:
 * 
 * http://java.sun.com/docs/books/tutorial/ui...sc/threads.html
 *
 * Note that the API changed slightly in the 3rd version:
 * You must now invoke start() on the SwingWorker after
 * creating it.
 */
abstract class SwingWorker {
	private Object value;  // see getValue(), setValue()

	/** 
	 * Class to maintain reference to current worker thread
	 * under separate synchronization control.
	 */
	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; 
	}

	/** 
	 * Compute the value to be returned by the get method. 
	 */
	public abstract Object construct();

	/**
	 * Called on the event dispatching thread (not on the worker thread)
	 * after the construct method has returned.
	 */
	public void finished() {
	}

	/**
	 * A new method that interrupts the worker thread.  Call this method
	 * to force the worker to stop what it's doing.
	 */
	public void interrupt() {
		Thread t = threadVar.get();
		if (t != null) {
			t.interrupt();
		}
		threadVar.clear();
	}

	/**
	 * Return the value created by the construct method.  
	 * Returns null if either the constructing thread or the current
	 * thread was interrupted before a value was produced.
	 * 
	 * @return the value created by the construct method
	 */
	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 construct 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();
		}
	}
}