线程的加入

package defaul;

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JProgressBar;

public class JoinText extends JFrame{
	
	private static final long serialVersionUID = 1L;
	private Thread threadA;
	private Thread threadB;
	final JProgressBar progressBar = new JProgressBar();
	final JProgressBar progressBar2 = new JProgressBar();
	public static void main(String[] args) {	
		new JoinText().setVisible(true);		
	}
	public JoinText(){
		super();
		getContentPane().add(progressBar, BorderLayout.NORTH);
		getContentPane().add(progressBar2, BorderLayout.SOUTH);
		progressBar.setStringPainted(true);
		progressBar2.setStringPainted(true);
		
		threadA = new Thread(new Runnable() {
			int count = 0;
			@Override
			public void run() {
				// TODO Auto-generated method stub
				while(true){
					progressBar.setValue(++count);
					try {
						threadA.sleep(100);
						if(count==20){
							threadB.join(2000);//线程B加入线程A至多等待200ms
						}
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
				
			}
		});
		threadA.start();
				
		threadB = new Thread(new Runnable() {
			int count = 0;
			@Override
			public void run() {
				// TODO Auto-generated method stub
				while(true){
					progressBar2.setValue(++count);
					try {
						threadA.sleep(100);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
				
			}
		});
		threadB.start();
		setBounds(200,200,300,100);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
	}
}