ObjectMonitorExample.java

ObjectMonitorExample.java

package locktest;

import java.text.MessageFormat;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class ObjectMonitorExample implements Runnable {
	static Object lock = new Object();
	static int count = 5;

	public static void main(String[] args) {
		Display display = Display.getDefault();

		Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());

		Button btn = new Button(shell, SWT.PUSH);
		btn.setText(MessageFormat.format("unlock:{0}", count));
		btn.addListener(SWT.Selection, new Listener() {
			@Override
			public void handleEvent(Event event) {
				synchronized (lock) {
					count--;
					lock.notify();
				}
				btn.setText(MessageFormat.format("unlock:{0}", count));
			}
		});

		new Thread(new ObjectMonitorExample()).start();

		shell.pack();
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
	}

	@Override
	public void run() {
		System.out.println("대기중입니다.");
		try {
			synchronized (lock) {
				while (count > 0) {
					System.out.println(MessageFormat.format("{0}개의 작업을 기다리는 중.", count));
					lock.wait();
				}
			}
		} catch (InterruptedException e) {
			e.printStackTrace();
		}

		System.out.println("대기 종료");
	}
}