import java.applet.Applet;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;

public class WebTest extends Applet   //类的名字建议大写
{
   
  public void paint(Graphics g)
  {
    int k=10;
    g.setColor(Color.red);
    
    for (int i=1;i<=30;i++)
      g.drawString(""+i,20,20+i*15);

  }

  public static void main(String args[])
  {
    Frame frame0=new Frame("Frame1");
    WebTest web1=new WebTest();
    frame0.add(web1);  //Applet是Panel类的子类，所以，当做Panel直接加在Frame里面就行了。
    frame0.setSize(800,600);  
    frame0.setVisible(true);
  }
}

------解决方案--------------------

探讨

mport java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class webTest extends Applet  
{
  
   public void paint(Graphics g)
     {
         int k=10;
         g.setColor(Co……


------解决方案--------------------

你加上下面的code:
Java code

frame0.addWindowListener(new WindowAdapter() {
        @Override
        public void windowClosing(WindowEvent e) {
            super.windowClosed(e);
            System.exit(0);
        }
    });