关于验证ＦlowＬayout的问题 ，感觉程序没错啊 怎么没有显示结果啊

Question

package etfgeg;/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*<applet code="FlowLayoutDemo",width=250,height=200>
</applet>*/
public class FlowLayoutDemo extends Applet implements ItemListener
{ String msg="";
Checkbox Win98,WinNT,Linux,mac;
public void init()
{ setLayout(new FlowLayout(FlowLayout.LEFT));//再次定位流式布局管理器
Win98=new Checkbox("win98",null,true);
WinNT=new Checkbox("WinNT/2000");
Linux=new Checkbox("Linux/Unix");
mac=new Checkbox("macOS");
add(Win98);
add(WinNT);
add(Linux);
add(mac);
Win98.addItemListener(this);
WinNT.addItemListener(this);
Linux.addItemListener(this);
mac.addItemListener(this);
}
public void itemStateChanged(ItemEvent ie)
{ repaint();
}
public void paint(Graphics g)
{ msg="Current state";
g.drawString(msg,6,80);
msg="Window98:"+Win98.getState();
g.drawString(msg,6,100);
msg="WinNT/2000:"+WinNT.getState();
g.drawString(msg,6,120);
msg="Linux/Unix:"+Linux.getState();
g.drawString(msg,6,140);
msg="MacOs"+mac.getState();
g.drawString(msg,6,160);}}

Answer 1

/*<applet code="FlowLayoutDemo",width=250,height=200>
</applet>*/
改为
/*<applet code="FlowLayoutDemo.class" height=200 width=250>
</applet>*/