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)]+"=");

  }

 }

四则运算程序