该程序中如何添加main(),很困惑
程序源代码如下:
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class FlowLayoutDemo extends Applet implements ItemListener
{
String msg="";
Checkbox Win98, WinNT,Linux, mac;
public void init()
{
setLayout(new FlowLayout(FlowLayout.LEFT));
Win98= new Checkbox("Win98",null,true);
WinNT = new Checkbox("Win NT/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=" Window 98: "+Win98.getState();
g.drawString(msg, 6, 100);
msg=" Window NT / 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);
}
}
执行结果为:
E:\dya>javac FlowLayoutDemo.java
E:\dya>java FlowLayoutDemo
Exception in Thread "main" java.lang.NoClassDefFoundError:FlowLayoutDmo
请问main 应该添加到程序的那一个部分及main的内容是什么?