java swt 进度条

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;


public class ProgressBarExample {
    public static void main(String[] args){
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new GridLayout());
        //添加平滑的进度条
        ProgressBar pb1 = new ProgressBar(shell,SWT.HORIZONTAL|SWT.SMOOTH);
        pb1.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
        //显示进度条的最小值
        pb1.setMinimum(0);
        //设置进度条的最大值
        pb1.setMaximum(30);
        //添加自动递增的进度条
        ProgressBar pb2 = new ProgressBar(shell,SWT.HORIZONTAL|SWT.INDETERMINATE);
        //添加线程，在线程中处理长时间的任务，并最终反映在平滑进度条上
        new LongRunningOperation(display,pb1).start();
        shell.open();
        while(!shell.isDisposed()){
            if(!display.readAndDispatch()){
                display.sleep();
            }
        }
    }
}
class LongRunningOperation extends Thread{
    private Display display;
    private ProgressBar progressBar;
   
    public LongRunningOperation(Display display,ProgressBar progressBar){
        this.display = display;
        this.progressBar = progressBar;
    }
   
    public void run(){
        //模仿长时间的任务
        for(int i = 0;i<30;i++){
            try{
                Thread.sleep(1000);
            }catch(InterruptedException e){
               
            }
            display.asyncExec(new Runnable(){
                public void run(){
                    if(progressBar.isDisposed()) return;
                    //进度条递增
                    progressBar.setSelection(progressBar.getSelection()+1);
                }
            });
        }
    }
   
}