怎样才能解决？

这个程序我在CMD里用appletviewer运行，结果有错误，提示是ComboBoxDemo.class不是public对象或没有公共构造函数！
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Example64{
public static void main(String[] args)
{ ComboBoxDemo myComboBoxGUI=new ComboBoxDemo();
}

}
class ComboBoxDemo extends JFrame implements ActionListener,ItemListener{
public static final int Width=350;
public static final int Height=150;
String porList[]={"踢足球","打篮球","打排球"};
JTextField text;
JComboBox comboBox;
public ComboBoxDemo()  {
setSize(Width,Height);
setTitle("组合框使用示意程序");
Container conPane=getContentPane();
conPane.setBackground(Color.BLUE);
conPane.setLayout(new FlowLayout());
comboBox=new JComboBox(porList);
comboBox.addActionListener(this);
comboBox.addItemListener(this);
comboBox.setEditable(true);
conPane.add(comboBox);
text=new JTextField();
conPane.add(text);
comboBox.setVisible(true);
}
public void itemStateChanged(ItemEvent e)
{
if(e.getSource()==comboBox)
{
text.setText(comboBox.getSelectedItem().toString());
}
}  public void actionPerformed(ActionEvent e)
{
if(e.getSource()==comboBox)
{
text.setText(comboBox.getSelectedItem().toString());
}
}
}
我的html文件是这么写的：
<html>
<body>
<applet
code="ComboBoxDemo.class" width=320 height=180>
</applet>
</body>
</html>

求技术分

零敢 · 零敢

class Example64 {

public static void main(String[] args) {
      ComboBoxDemo myComboBoxGUI = new ComboBoxDemo();
}
}

class ComboBoxDemo extends JFrame implements ActionListener, ItemListener {

public static final int Width = 350;
public static final int Height = 150;
String porList[] = {"踢足球", "打篮球", "打排球"};
JTextField text;
JComboBox comboBox;

public ComboBoxDemo() {
      setSize(Width, Height);
      setTitle("组合框使用示意程序");
      Container conPane = getContentPane();
      conPane.setBackground(Color.BLUE);
      conPane.setLayout(new FlowLayout());
      comboBox = new JComboBox(porList);
      comboBox.addActionListener(this);
      comboBox.addItemListener(this);
      comboBox.setEditable(true);
      conPane.add(comboBox);
      text = new JTextField(5);
      conPane.add(text);
      comboBox.setVisible(true);
      setVisible(true);
}

public void itemStateChanged(ItemEvent e) {
      if (e.getSource() == comboBox) {
         text.setText(comboBox.getSelectedItem().toString());
      }

}

public void actionPerformed(ActionEvent e) {
      if (e.getSource() == comboBox) {
         text.setText(comboBox.getSelectedItem().toString());
      }
}
}
该这样就好了，frame要setVisible(true)才显示。textfield创建要设置长度。好像这个问题我以前回答过一样的问题。

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怎样才能解决？

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