package runok;

 import java.util.*;

 import java.awt.*;

 import java.awt.event.ActionEvent;

 import java.awt.event.ActionListener;

 import javax.swing.*;

 public class vv extends JFrame implements ActionListener{

 /**

 * 作者：范铭祥

 * 功能：一个简单的小学生四则运算 自动 生成系统

 */

 JPanel jp1,jp2,jp3;

 JLabel jlb1,jlb2;

 JButton jb1;

 JTextField jtf1,jtf2;

 JTextArea ee;

 public double w1;

 public double m1;

 String fh;

 public static void main(String[] args)

 {

   vv start=new vv();

 }

 public vv()

 {

     jp1=new JPanel();

     jp2=new JPanel();

     jp3=new JPanel();

     jlb1=new JLabel("题目");

     jlb2=new JLabel("你的答案:");

     jb1=new JButton("判断答案");

     jb1.addActionListener(this);

     jb1.setActionCommand("aa");

     JTextArea txtArea = new JTextArea(1,15);

     jtf2=new JTextField(20);

    ee = new JTextArea(1,10);

     //设置布局管理

     this.setLayout(new GridLayout(3,1));

     //加入各个组件

     jp1.add(jlb1);

     jp1.add(txtArea);

     jp2.add(jlb2);

     jp2.add(jtf2);

     jp3.add(jb1);

     jp3.add(ee);

     //加入到JFrame

     this.add(jp1);

     this.add(jp2);

     this.add(jp3);

 //在这里用yy方法来获取题目 w 符号 m

     yy tt=new yy();

     w1=tt.ret1();

     m1=tt.ret2();

     fh=tt.ret3();

     txtArea.append(w1+fh+m1);

     this.setSize(400, 250);

     this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

     this.setVisible(true);

 }

 public void yes()

 { ee.append("正确！");    }

 public void no()

 {ee.append("错误！");}

 public void cc()

 {

     int answer=(int) (Double.parseDouble(jtf2.getText()));;

         if(fh.equals("+"))

         {

             if(answer==w1+m1){

                 yes();

             }else{

                 no();

             }

         }

         if(fh.equals("-"))

         {

                 if(answer==w1-m1){

                     yes();

                 }else{

                     no();

                 }

         }

         if(fh.equals("*"))

         {

                 if(answer==w1*m1){

                    yes();

                 }else{

                    no();

                 }

         }

         if(fh.equals("/"))

         {

                 if(answer==w1/m1){

                     yes();

                 }else{

                     no();

                 }

         }

 }

 @Override

 public void actionPerformed(ActionEvent e)

     {

     // !!!!

     if(e.getActionCommand()=="aa")

     {

         cc();

     }

     }

 }

 class yy

 {

     private int max=4;

     private int min=1;

     private double w2,m2;

     private String ff;

     Random random = new Random();

     //System.out.println(s);

     public yy()

     {

     int s = random.nextInt(max)%(max-min+1) + min;

     double x=random.nextInt(max-2)%(max-2-min+1) + min;

     double y=random.nextInt(max-1)%(max-1-min+1) + min;

     int y1up=(int) Math.pow(10,x);

     int y1dn=(int) Math.pow(10,x-1);

     int y2up=(int) Math.pow(10,y);

     int y2dn=(int) Math.pow(10,y-1);

     int x_y1=random.nextInt(y1up)%(y1up-y1dn+1) + y1dn;

     int x_y2=random.nextInt(y2up)%(y2up-y2dn+1) + y2dn;

     double w=(double)x_y1;

     double m=(double)x_y2;

     this.w2=w;

     this.m2=m;

     switch(s)

     {

     case 1:

     {

     this.ff="+";

     System.out.println(w+"+"+m+"=" );

     break;

     }

     case 2:

     {

     this.ff="-";

     System.out.println(w+"-"+m+"=" );

     break;

     }

     case 3:

     {

     this.ff="*";

     System.out.println(w+"*"+m+"=" );

     break;

     }

     case 4:

     {

     this.ff="/";

     System.out.println(w+"/"+m+"=" );

     break;

     }

     }

     }

     public double ret1()

     {

         return w2;

     }

     public double ret2()

     {

         return m2;

     }

     public String ret3()

     {

         return ff;

     }

 }