java实现随机输出300题四则运算

package demo;

import java.util.Random;

public class math {
       
    public static void main(String[] args) {
           
        String[] operate=new String[]{"+","-","×","÷"};
           int[] numbers=new int[1000];
           
           for(int i=1;i<=1000;i++){
           numbers[i-1]=i;
       }
          Random r=new Random();
      
          for(int i=0;i<300;i++){
      
              System.out.println(numbers[r.nextInt(1000)]+operate[r.nextInt(4)]+numbers[r.nextInt(1000)]+"=");
       }
      }
     }