用多线程编程, 实现时间显示的实例
TimeThread1.java

package GUI.Thread;

import javax.swing.;
import java.awt.;
import java.text.SimpleDateFormat;
import java.util.Date;


public class TimeThread1 extends Thread {


    public JPanel jp;
    public JFrame jf;
    public JLabel jLabel_Time;

    public TimeThread1() {
        jf = new JFrame("动态时间");
        jf.setSize(250, 100);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        jf.setLocationRelativeTo(null);
        jf.setResizable(false);

        jp = new JPanel(new FlowLayout());
        jLabel_Time = new JLabel("null");
        jLabel_Time.setFont(new Font(null, Font.PLAIN, 26));

        jp.add(jLabel_Time);
        jf.setContentPane(jp);
        jf.setVisible(true);
    }

    @Override
    public void run() {

        while (true) {
            Date nowDate = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss:SSS");
            jLabel_Time.setText(sdf.format(nowDate.getTime()));
        }

    }



`}
`

TimeThread1Test.java

package GUI.Thread;

public class TimeThread1Test {


    public static void main(String[] args) {
        Thread th = new TimeThread1();
        th.start();
    }



`}
`

用继承Thread类的方式，实现线程。