一个小程序，自行编写一个HTML文件嵌入运行就行了。 import java.awt.*;import java.awt.event.*;import java.applet.*;public class Add extends Applet implements ActionListener{Label ask,result;TextField answer;Button submit;int a=6,b=9; public static void main(String args[]) {Add a=new Add();  a.init(); } public void init() {Panel p=new Panel();  setLayout(new BorderLayout());  p.setLayout(null);  ask=new Label(Integer.toString(a)+"+"+Integer.toString(b));  ask.setFont(new Font("宋体",Font.BOLD,16));  answer=new TextField(5);  result=new Label();  submit=new Button("OK");  submit.addActionListener(this);  p.add(ask);p.add(answer);p.add(result);p.add(submit);  ask.setBounds(50,20,70,20);answer.setBounds(160,20,70,20);  result.setBounds(50,60,90,20);submit.setBounds(160,60,70,20);  add("Center",p);p.setVisible(true); } public void actionPerformed(ActionEvent e) {try  {if(Integer.valueOf(answer.getText())==a+b)result.setText("正确");   else result.setText("不正确");  }  catch(Exception ee)  {result.setText("请输入正确格式");  } }}

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