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)]+"=");
    }
   }
   }