java的applet小程序为什么不能在eclipse上运行

//c9:BorderLyout1.java
//author:LiuWei
//This program is protected by laws.
//<applet code=BorderLayout1 width=400 height=200>
//</applet>
import javax.swing. *;
import java.awt. *;
public class BorderLayout1 extends JApplet
{
public void init()
{
Container cp=getContentPane();
BorderLayout layout=new BorderLayout(0,0);
cp.add(layout.NORTH,new JButton("1"));
cp.add(layout.SOUTH,new JButton("2"));
cp.add(layout.EAST,new JButton("3"));
cp.add(layout.WEST,new JButton("4));
cp.add(layout.CENTER,new JButton("5));
}
}

你的程序少了一句　setVisible(true);　加上这句，再加上把 cp.add(layout.WEST,new JButton("4));和cp.add(layout.CENTER,new JButton("5));的引号加上就可以运行了。完整的程序如下：
import javax.swing. *;
import java.awt. *;
public class BorderLayout1 extends JApplet
{
public void init()
{
Container cp=getContentPane();
BorderLayout layout=new BorderLayout(0,0);
cp.add(layout.NORTH,new JButton("1"));
cp.add(layout.SOUTH,new JButton("2"));
cp.add(layout.EAST,new JButton("3"));
cp.add(layout.WEST,new JButton("4"));
cp.add(layout.CENTER,new JButton("5"));

setVisible(true);
}
}

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