另一个四则运算

import com.sun.javaws.IconUtil;
//这个跟那个差不多 进步在于 类 至于三年级没写 道理相同

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        String []cun =new String[10000];
        int  []daan =new int [1000];
        double [ ]shuru = new double [1000];
        String []cuotiji = new String[1000];
        double []cuotidaan = new double[1000];
        String []error = new String[100];
        String[] cunfuhao = new String[10000];
        int sum = 0;
        int count=0;
        int right=0;
        while (true) {
            System.out.println("欢迎来到四则运算");
            System.out.println("1.小学二年级口算题");
            System.out.println("2.小学三年级口算题");
            System.out.println("3.小学四年级口算题");
            System.out.println("请选择年级：");
            two t = new  two();
            three  th = new three();
            four f = new four();
            Scanner sc =new Scanner(System.in);
            int choose  = sc.nextInt();


            loop1:switch (choose){
                case 1: {

                    loop2:while (true) {
                        System.out.println("请输入出题个数");
                        int chutishu = sc.nextInt();
                        int jishu = 0;
                        loop:while (true){
                              int  num1 = t.shuzi(100,0);
                              char c = t.caozuofu();
                              int  num2 = t.shuzi(100,0);
                              if(c=='/'&&num1%num2!=0){
                                  continue;
                              }
                            System.out.println(num1+" " + c +" "+ num2 + " = " );
                              System.out.println("请输入答案：");
                              int answer = sc.nextInt();
                              boolean flag1 =t.panduan(num1,c,num2,answer);
                              if(!flag1){
                                  t.cundaan(c,num1,num2,daan,count);
                                  error[count] = num1 +" " + c +" "+ num2 + " = ";
                                  count++;
                                  sum++;
                                  jishu++;
                              }
                              else {
                                  right++;
                                  sum++;
                                  jishu++;
                              }
                              if(jishu == chutishu){
                                  System.out.println("1.下一套");
                                  System.out.println("2.做错题");
                                  System.out.println("3.返回主界面");
                                  System.out.println("4.退出");
                                  int choose2 = sc.nextInt();
                                  switch (choose2){
                                      case 1:{
                                          break loop;
                                      }
                                      case 2:{
                                          zuocuoti(error,count,daan);
                                      }
                                      case 3:{
                                          break loop1;
                                      }
                                      case 4:{
                                          System.exit(0);
                                      }
                                  }
                              }
                          }
                    }
                }
                case 2 :{
                    loop2:while (true) {
                        System.out.println("请输入需要的操作数：");
                        int m = sc.nextInt();
                        System.out.println("请输入需要的题目个数：");
                        int n = sc.nextInt();
                        for (int i = 0; i < n; i++) {
                            int an = 0;
                            String s=null;
                            for (int j = 0; j < m; j++) {
                                int num = th.shuzi(1000,0);
                                System.out.print(num+" ");
                                char c='.';
                                if(j==0){
                                    an=num;
                                }
                                else {
                                    an = th.jisuan(an,c,num);
                                }
                                c = th.caozuofu();
                                if(j==m-1){
                                    c='=';
                                }
                                System.out.print(c+" ");
                                if(j==0){
                                    s=num + " "+c+" ";
                                }
                                else {
                                    s += num + " "+c+" ";
                                }
                            }
                            System.out.println("");
                            System.out.println("请输入你的答案:");
                            int answer = sc.nextInt();
                            if(answer!= an){
                                error[count]=s;
                                count++;
                            }
                            else {
                                right++;
                            }
                        }
                        System.out.println("1.下一套");
                        System.out.println("2.做错题");
                        System.out.println("3.返回主界面");
                        System.out.println("4.退出");
                        int choose2 = sc.nextInt();
                        switch (choose2){
                            case 1:{
                                break;
                            }
                            case 2:{
                                zuocuoti(error,count,daan);
                            }
                            case 3:{
                                break loop1;
                            }
                            case 4:{
                                System.exit(0);
                            }
                        }
                    }
                }
                case 3:{

                    break;
                }
            }
        }
    }
    public static  void zuocuoti(String []error,int count,int []daan){
        for (int i = 0; i < count; i++) {
            System.out.println(error[i]);
            System.out.println("请输入答案");
            Scanner sc =new Scanner(System.in);
            int answer = sc.nextInt();
            if(answer!=daan[i]){
                System.out.println("很遗憾，又答错了");
            }
            else {
                System.out.println("恭喜你，答对了");
            }
        }
    }

}