import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;public class Arithmetic {public static void main(String[] args){MathF math = new MathF();math.show();}
}
class MathF extends JFrame{public MathF(){Container contentPane = getContentPane();final Panel panel = new Panel();contentPane.add(panel);//contentPane.add(label);setSize(500,500);setTitle("四则运算");setResizable(false);setLocation(0,0);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);panel.setCursor(new Cursor(Cursor.HAND_CURSOR));JMenuBar menuBar = new JMenuBar();JMenu menuSet=new JMenu("设置");JMenu menuOut=new JMenu("退出");JMenuItem TISHU = new JMenuItem("题数");        JMenuItem NANDU = new JMenuItem("难度");JMenuItem YUYAN = new JMenuItem("语言");JMenuItem TUICHU = new JMenuItem("退出");menuBar.add(menuSet);menuSet.add(TISHU);TISHU.addActionListener(new ActionListener(){  public void actionPerformed(ActionEvent e){  String i1 = JOptionPane.showInputDialog(null, "请输入你需要的题目数：\n", "题目数",JOptionPane.QUESTION_MESSAGE);  int count = Integer.parseInt(i1);panel.SUIJI(count);}   });menuSet.add(NANDU);menuSet.add(YUYAN);menuSet.add(TUICHU);TUICHU.addActionListener(new ActionListener(){  public void actionPerformed(ActionEvent e){  int i1 = JOptionPane.showConfirmDialog(null,"是否退出？","提示：",JOptionPane.YES_NO_OPTION); if(i1==JOptionPane.OK_OPTION){System.exit(0); }else{String z = "请继续！";JOptionPane.showMessageDialog(null, z);}  }   });this.setJMenuBar(menuBar);}
}class Panel extends JPanel{//int result;static int score = 0;JButton BUTTON = new JButton(); //提交按钮 触发事件JLabel SCORE = new JLabel();//准确率JLabel OUT = new JLabel();//退出ArrayList<JTextField> answer=new ArrayList<>();public Panel(){ //printf("正确率为：%lf",score*1.0/count);//this.add(SCORE);//this.add(BUTTON);BUTTON.setLocation(100,100);}public void SUIJI(int count){int SUIJI;// printf("请输入题目数？");//scanf("%d",&count);String s1,s2=null;for(int i=0;i<count;i++){SUIJI = new Random().nextInt(2);if(SUIJI==0){s2=this.zhengshu();}else{s2=this.fenshu();}s1=answer.get(i).getText();System.out.println(s1);if(s1.equals(s2)){score ++ ;}}this.add(BUTTON);this.add(SCORE);BUTTON.setText("\r提交");//this.add(OUT);BUTTON.addActionListener(new ActionListener(){  public void actionPerformed(ActionEvent e){SCORE.setText("正确率："+score/count);}}); }public String zhengshu(){String result=new String();int left = new Random().nextInt(9) + 1;int mid = new Random().nextInt(4);int right = new Random().nextInt(9) + 1;JLabel XIANSHI1 = new JLabel();JLabel XIANSHI2 = new JLabel();JLabel XIANSHI3 = new JLabel();//JButton TIJIAO = new JButton();JTextField SHURU = new JTextField(10);String s2 =null;this.add(XIANSHI1);this.add(XIANSHI2);this.add(XIANSHI3);//this.add(TIJIAO);//this.add(BUTTON);this.add(SHURU);answer.add(SHURU);//is.setLayout(null);XIANSHI1.setText("         "+left+" ");switch(mid){case(0):result=left+right+"";XIANSHI2.setText(" + ");break;case(1):result=left-right+"";XIANSHI2.setText(" - ");break;case(2):result=left*right+"";XIANSHI2.setText(" * ");break;case(3):result=left/right+"";XIANSHI2.setText(" / ");break;}XIANSHI3.setText(" "+right+"   =       ");System.out.println(left+" " +mid+" "+right +result);return result;}public String fenshu(){int left_x,left_y,mid,right_x,right_y,x = 0,y = 0,GYS;do{left_x = new Random().nextInt(9) + 1;left_y = new Random().nextInt(9) + 1;mid = new Random().nextInt(4) ;right_x = new Random().nextInt(9) + 1;right_y = new Random().nextInt(9) + 1;}while(!(left_x<left_y&&right_x<right_y));JLabel XIANSHI1 = new JLabel();JLabel XIANSHI2 = new JLabel();JLabel XIANSHI3 = new JLabel();//JLabel TIJIAO = new JLabel();JTextField SHURU = new JTextField(10);String s1 = SHURU.getText();String s2 ="";this.add(XIANSHI1);this.add(XIANSHI2);this.add(XIANSHI3);//this.add(TIJIAO);//this.add(BUTTON);this.add(SHURU);answer.add(SHURU);//is.setLayout(null);XIANSHI1.setText("        "+left_x+"/"+left_y);switch(mid){case(0):x=left_x*right_y+left_y*right_x;y=left_y*right_y;GYS=gcd(x,y);x=x/GYS;y=y/GYS;s2 = x +"/" +y;XIANSHI2.setText(" + ");break;case(1):x=left_x*right_y-left_y*right_x;y=left_y*right_y; GYS=gcd(x,y);x=x/GYS;y=y/GYS; s2 = x +"/" +y;XIANSHI2.setText(" - ");break;case(2):x=left_x*right_x;y=left_y*right_y;GYS=gcd(x,y);x=x/GYS;y=y/GYS;s2 = x +"/" +y;XIANSHI2.setText(" * ");break;case(3):x=left_x*right_y;y=left_y*right_x;GYS=gcd(x,y);x=x/GYS;y=y/GYS;s2 = x +"/" +y;XIANSHI2.setText(" / ");break;}System.out.println(left_x+"/"+left_y +"   "+mid+"   "+right_x+"/"+right_y+"="+x +"/" +y);XIANSHI3.setText(" "+right_x+"/"+right_y+"  =      ");return s2;}private int gcd(int x, int y) {int r;r=x%y;while(r!=0){x=y;y=r;r=x%y;}return y;}
}