java实现随机输出300题四则运算

packagedemo;

importjava.util.Random;

publicclassmath {

  publicstaticvoidmain(String[] args) {

    String[] operate=newString[]{"+","-","×","÷"};

      int[] numbers=newint[1000];

      for(inti=1;i<=1000;i++){

      numbers[i-1]=i;

    }

     Random r=newRandom();

     for(inti=0;i<300;i++){

       System.out.println(numbers[r.nextInt(1000)]+operate[r.nextInt(4)]+numbers[r.nextInt(1000)]+"=");

    }

   }

   }