小程序中构造函数的存在引发异常 [英] Presence of constructor in an applet throws exception

问题描述

我正在运行下面的小程序.在其中，当我添加构造函数(甚至为空)时，小程序会抛出运行时异常:

I'm running the below applet. In it, the moment I add the constructor (even empty), the applet throws a runtime exception:

MainFrame.class can't be instantiated, java.lang.InstantiationException 

如果我删除构造函数，则不会抛出异常.小程序中不能有构造函数吗?

If I remove the constructor, no exception in thrown. Can't I have a constructor present in an applet?

public class MainFrame extends JApplet implements  WindowListener, ActionListener {
    public void init()
    {       
        System.out.println("Applet Step1");
        String[] args = null;
        createAndShowGUI(args);      
    }
    private static void createAndShowGUI(String[] args) { /*code*/ }
    public MainFrame(final String[] args) {}
}

推荐答案

你也需要添加一个默认构造函数...

You need to add a default constructor too...

public MainFrame() {}

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