computerframe.java

这是一个用java做的算术测试小程序,很好用,能够自动获取算术表达式.

import java.awt.*;
import java.awt.event.*;
public class ComputerFrame extends Frame implements ActionListener
 {TextField textOne,textTwo,textResult;
  Button getProblem,giveAnwser;
  Label operatorLabel,message;
  Teacher teacher;
  ComputerFrame(String s)
  { super(s);
    teacher=new Teacher();
    setLayout(new FlowLayout());
    textOne=new TextField(10);
    textTwo=new TextField(10);
    textResult=new TextField(10);
    operatorLabel=new Label("+");
    message=new Label("你还没有回答呢");
    getProblem=new Button("获取题目");
    giveAnwser=new Button("确认答案");
    add(getProblem);
    add(textOne);
    add(operatorLabel);
    add(textTwo);
    add(new Label("="));
    add(textResult);
    add(giveAnwser);
    add(message);
    textResult.requestFocus();
    textOne.setEditable(false);
    textTwo.setEditable(false);
    getProblem.addActionListener(this);
    giveAnwser.addActionListener(this);
    textResult.addActionListener(this);
    setBounds(100,100,450,100);
    setVisible(true);
    validate();
    addWindowListener(new WindowAdapter()
                      {public void windowClosing(WindowEvent e)
                           {System.exit(0);
                           }
                      }
                     );
  }
  public void actionPerformed(ActionEvent e)
  {if(e.getSource()==getProblem)
    { int number1=teacher.giveNumberOne(100);
      int number2=teacher.giveNumberTwo(100);
      String operator=teacher.giveOperator();
      textOne.setText(""+number1);
      textTwo.setText(""+number2);
      operatorLabel.setText(operator);
      message.setText("请回答");
      textResult.setText(null);
    }
   if(e.getSource()==giveAnwser)
    { String answer=textResult.getText();
      try{ int result=Integer.parseInt(answer);
            if(teacher.getRight(result)==true)
             { message.setText("你回答正确");
             }
             else
             { message.setText("你回答错误");
             }
         }
     catch(NumberFormatException ex)
         {  message.setText("请输入数字字符");
         }
    }
    textResult.requestFocus();
    validate();
  }
 }