这个程序没有main函数怎么运行的
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test extends JApplet{
public void init(){
Container contentPane = getContentPane();
JLabel label = new JLabel("Swing!",
new ImageIcon(getImage(getCodeBase(),"swing.gif"),"An animated GIF of Duke on a swing"),
SwingConstants.CENTER);
contentPane.add(label,BorderLayout.CENTER);
}
}