解决SWT多线程的问题

package com.yc.ui;

import java.util.Date;

public class Da {

	protected Shell shell;

	/**
	 * Launch the application.
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			Da window = new Da();
			window.open();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Open the window.
	 */
	public void open() {
		Display display = Display.getDefault();
		createContents();
		shell.open();
		shell.layout();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
	}

	/**
	 * Create contents of the window.
	 */
	protected void createContents() {
		shell = new Shell();
		shell.setSize(450, 300);
		shell.setText("SWT Application");
		
		Button button = new Button(shell, SWT.NONE);
		button.addDisposeListener(new DisposeListener() {
			//关闭窗口
			public void widgetDisposed(DisposeEvent arg0) {
				System.exit(0);
			}
		});
		
		button.setBounds(106, 104, 80, 27);
		button.setText("New Button");
		
		final Label label = new Label(shell, SWT.NONE);
		label.setBounds(106, 169, 236, 65);
		label.setText("New Label");
		button.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				
				Show s=new Show(label);
				
				Thread t=new Thread(s);
				t.start();
				
			}
		});
	}
}


	class Show implements Runnable{
		private Label label;
		public Show(Label label){
			this.label=label;
		}
		
	
		
		@Override
		public void run() {
			Display display=label.getDisplay().getDefault();
			while(true){
				//调用label的syncExec方法
			display.syncExec(new Runnable(){

				@Override
				public void run() {
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					label.setText(new Date()+"");
					
				}
				
			});
		}
			
			
	}
		
	
		
	}