编写3个线程分别各显示各自的运行时间,第1个线程每隔1秒运行1次,
第2个每隔5秒运行1次,第3个线程每隔10秒运行1次.

以前给别人写的
感觉差不多
改改吧


import javax.swing.*;
import java.awt.*;
import java.util.*;
import java.text.*;
public class Display extends JFrame{
    private JLabel tipLabel,timeText,timeText1,timeText2;
    private Container container;
    public Display (){
        container = getContentPane();
        container.setLayout(new GridLayout(4,1,5,5));
        tipLabel = new JLabel("各线程已运行时间:");
        timeText = new JLabel();
        timeText1 = new JLabel();
        timeText2 = new JLabel();
        container.add(tipLabel);
        container.add(timeText);
        container.add(timeText1);
        container.add(timeText2);
        
        try{
            Thread thread = new TimeDisplay(timeText,1);
            thread.start();
            Thread.sleep(1000);
            
            Thread thread1 = new TimeDisplay(timeText1,2);
            thread1.start();
            Thread.sleep(1000);
            
            Thread thread2 = new TimeDisplay(timeText2,3);
            thread2.start();
            Thread.sleep(1000);
        }
        catch(Exception e){
        }
        
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //pack();
        setSize(300,200);
        setVisible(true);
        
        //将窗口屏幕居中
        Toolkit kit = Toolkit.getDefaultToolkit();
        Dimension frameSize = getSize(),screenSize = kit.getScreenSize();
        setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
    }
    public static void main(String args[]){
        Display display = new Display();
    }
}

class TimeDisplay extends Thread {
    private JLabel timeField;
    private long start;
    private int number;
    
    public TimeDisplay(JLabel field,int num) {
        timeField = field;
        number = num;
        start = System.nanoTime();
    }

    public void run() {
        while(true){
            timeField.setText("线程"+number+"已经运行了"+String.valueOf((System.nanoTime()-start)/1000000000)+"秒");
            try{
                Thread.sleep(1000);
            }
            catch(Exception e){
            }
        }
    }
}

非常感谢了!!!

不错不错