Java 算数测试小程序

TestFrame.java

import javax.swing.*;
import java.awt.FlowLayout;
import java.awt.event.*;

public class TestFrame extends JFrame implements ActionListener
{
       JTextField textOne,textTwo,textResult;
       JButton getProblem,giveAnwser;
       JLabel operatorJLabel,message;
       TestOperator testOperator;

       public TestFrame()
       {
            testOperator=new TestOperator();
            setLayout(new FlowLayout());
            textOne=new JTextField(10); //创建textOne,其可见字符长是10
            textTwo=new JTextField(10); //创建textTwo,其可见字符长是10
            textResult=new JTextField(10); //创建textResult,其可见字符长是10
            operatorJLabel=new JLabel("+");
            message=new JLabel("你还没有回答呢");
            getProblem=new JButton("获取题目");
            giveAnwser=new JButton("确认答案");

            add(getProblem);
            add(textOne);
            add(operatorJLabel);
            add(textTwo);
            add(new JLabel("="));
            add(textResult);
            add(giveAnwser);
            add(message);

            textOne.setEditable(false);
            textTwo.setEditable(false);
            getProblem.addActionListener(this);//当前窗口注册为getProblem的ActionEvent事件监视器
            giveAnwser.addActionListener(this);//当前窗口注册为giveAnwser的ActionEvent事件监视器
            textResult.addActionListener(this);//当前窗口注册为textResult的ActionEvent事件监视器
       }
       public void actionPerformed(ActionEvent e)
      {
           if(e.getSource()==getProblem) //判断事件源是否是getProblem
          {
            int number1=testOperator.giveNumberOne(100);
            int number2=testOperator.giveNumberTwo(100);
            String operator=testOperator.giveOperator();
            textOne.setText(""+number1);
            textTwo.setText(""+number2);
            operatorJLabel.setText(operator);
            message.setText("请回答");
            textResult.setText(null);
          }
         if(e.getSource()==giveAnwser) //判断事件源是否是giveAnwser
         {
             String answer=textResult.getText();

            try{ int result=Integer.parseInt(answer);

                if(testOperator.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");
               }
          }
    }
}

TestOperator.java

public class TestOperator
{
     int numberOne,numberTwo;
     String operator="";
     boolean right;

     //随机生成第一个数
     public int giveNumberOne(int n)
     {
         numberOne=(int)(Math.random()*n)+1; //强制转换为int型
                                             //因为Math.random()返回的为double型
         return numberOne;
     }

    //随机生成第二个数
     public int giveNumberTwo(int n)
     {
         numberTwo=(int)(Math.random()*n)+1;
         return numberTwo;
      }

     //随机生成运算符号
      public String giveOperator()
      {
         double d=Math.random();
         if(d>=0&&d<0.25)
            operator="+";

         else if(d>0.25&&d<=0.5)
             operator="-";

         else if(d>0.5&&d<=0.75)
             operator="*";

         else
             operator="/";

         return operator;
      }

      //判断测试结果是否正确
      public boolean getRight(int answer)
      {
          if(operator.equals("+"))
          {
               if(answer==numberOne+numberTwo)
                  right=true;

               else
                  right=false;

           }

           else if(operator.equals("-"))
          {
               if(answer==numberOne-numberTwo)
                  right=true;

               else
                   right=false;
           }

           else if(operator.equals("*"))
           {
               if(answer==numberOne*numberTwo)
                  right=true;

                else
                   right=false;
            }
           else if(operator.equals("/"))
           {
               if(answer==numberOne/numberTwo)
                  right=true;

                else
                   right=false;
            }
   return right;
  }
}

MainClass.java

import javax.swing.JFrame;
import javax.swing.UIManager;

public class MainClass
{
       public static void main(String args[])
       {
           try {
                 UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); //windows界面风格
            } catch (Exception e) {
                e.printStackTrace();
            }
           TestFrame frame=new TestFrame();
           frame.setTitle("算数测试小程序");
           frame.setBounds(100,100,500,100);
           frame.setVisible(true);
           frame.setLocationRelativeTo(null);//窗体居中显示
           frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           frame.setResizable(false);
       }
}

效果图：