JAVA中提示我在类 Clock 中找不到主方法要怎么解决

Question

代码如下：

运行后一直提示错误: 在类 Clock 中找不到主方法, 请将主方法定义为:
public static void main(String[] args)

初学小白求解答

Answer 1

这是完整代码：
import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.text.SimpleDateFormat;
public class Clock extends JApplet implements Runnable
{
Thread clockThread1;
Thread clockThread2;
Thread clockThread3;
boolean f1,f2,f3;

SimpleDateFormat formatter;

Date currentDate1,currentDate2,currentDate3;
String lastdate1,lastdate2,lastdate3;

public void init()
{
    super.setBackground(Color.LIGHT_GRAY);
    formatter=new SimpleDateFormat("hh:mm:ss",Locale.getDefault());
    currentDate1=new Date();
    lastdate3=lastdate2=lastdate1=formatter.format(currentDate1);

    clockThread1=new Thread(this,"Clock-thread1");
    clockThread2=new Thread(this,"Clock-thread2");
    clockThread3=new Thread(this,"Clock-thread3");
    clockThread1.start();
    clockThread2.start();
    clockThread3.start();
}
public void run()
{
    boolean flag=true;
    while(flag)
    {
        try
        {
            if (Thread.currentThread() == clockThread1){
                Thread.sleep(1000);
                f1 = true;
            }
            if (Thread.currentThread() == clockThread2){
                Thread.sleep(2000);
                f2 = true;
            }
            if (Thread.currentThread() == clockThread3){
                Thread.sleep(3000);
                f3 = true;
            }
            super.repaint();
        }
        catch(InterruptedException e)
        {
            flag=false;
        }
    }
}
public void paint (Graphics g)
{
    g.setColor(this.getBackground());
    if (f1){
        currentDate1=new Date();
        lastdate1=formatter.format(currentDate1);
        g.fillRect(5, 0, 50, 10);
        f1 = false;
    }
    if (f2){
        currentDate2=new Date();
        lastdate2=formatter.format(currentDate2);
        g.fillRect(125, 0, 50, 10);
        f2 = false;
    }
    if (f3){
        currentDate3=new Date();
        lastdate3=formatter.format(currentDate3);
        g.fillRect(225, 0, 50, 10);
        f3 =false;
    }
    g.setColor(getForeground());
    g.drawString(lastdate1,5,10);
    g.drawString(lastdate2,125,10);
    g.drawString(lastdate3,225,10);
}

}