java四则运算作业

package 测试1;
import java.util.Scanner;
import java.util.Random;
public class operations
{
    public static String b;
    public static int j=0;
    public static int u=0;
    public String c="+";
    public String d="-";
    public String e="*";
    public String f="/";
    public static int num1;
    public static int num2;
    int z[]=new int[1000000];
    int x[]=new int[1000000];
    String v[]=new String[1000000];
    void fuzhi()
    {
        num1=(int)(Math.random()*100);
        num2=(int)(Math.random()*100);
    }
    void fuhao()
    {
        int a=(int)(Math.random()*100);
        if(0<a&&a<=25)
        {
            b="+";
        }
        else if(25<a&&a<=50)
        {
            b="-";
        }
        else if(50<a&&a<=75)
        {
            b="*";
        }
        else if(75<a&&a<100)
        {
            b="/";
        }
    }
    void jia()
    {
        operations A=new operations();
        A.fuzhi();
        if(b.equals(c))
        {
                System.out.print(operations.num1);
                System.out.print(b);
                System.out.print(operations.num2);
                System.out.println("=");
        }
    }
    void jian()
    {
        operations A=new operations();
        A.fuzhi();
        if(b.equals(d))
        {
            if(num1>=num2)
            {
                System.out.print(operations.num1);
                System.out.print(b);
                System.out.print(operations.num2);
                System.out.println("=");
            }
            else
            {
                System.out.print(operations.num2);
                System.out.print(b);
                System.out.print(operations.num1);
                System.out.println("=");
            }
        }
    }
    void cheng()
    {
        operations A=new operations();
        A.fuzhi();
        if(b.equals(e))
        {
            double q=num1*num2;
            if(q<100)
            {
                System.out.print(operations.num1);
                System.out.print(b);
                System.out.print(operations.num2);
                System.out.println("=");
            }
            else
            {
                A.cheng();
            }
        }
    }
    
    void chu()
    {
        operations A=new operations();
        A.fuzhi();
        if(b.equals(f))
        {
          if(num2!=0)
          {
                if(num1%num2==0)
            {
                System.out.print(operations.num1);
                System.out.print(b);
                System.out.print(operations.num2);
                System.out.println("=");
            }
            else
            {
                A.chu();
            }
          }
          else
          {
              A.chu();
          }
        }
    }
    void chongfu()
    {
        operations A=new operations();
        z[j]=A.num1;
        x[j]=A.num2;
        v[j]=A.b;
        j++;
    }
    void yanzheng()
    {
        operations A=new operations();
        for(int i=0;i<j;i++)
        {
            if((z[i]==z[j])&&(x[i]==x[j])&&(v[i].equals(v[j])))
            {
                A.kaishi();
            }
        }
    }
    void kaishi()
    {
        operations A=new operations();
        for(int i=0;i<u;i++)
        {
            A.fuhao();
            System.out.print(i+1);
            System.out.print(". ");
            A.jia();
            A.jian();
            A.cheng();
            A.chu();
        }
    }
    public static void main(String[] args)
    {
        operations A=new operations();
        Scanner input=new Scanner(System.in);
        System.out.println("请输入想得到的个数");
        int t=input.nextInt();
        u=t;
        for(int i=0;i<u;i++)
        {
            A.fuhao();
            System.out.print(i+1);
            System.out.print(". ");
            A.jia();
            A.jian();
            A.cheng();
            A.chu();
            A.chongfu();
            if(i>1) {
            A.yanzheng();}
        }
    }
}

实现随机产生100以内的四则运算，并验证是否重复