java随机生成300道四则运算题

 1 package yunsuan;
 2 
 3 import java.util.Random;
 4 
 5 public class math {
 6     public static void main(String[] args) {
 7         String[] operate = new String[] { "+", "-", "*", "/" };
 8         int[] numbers = new int[1000];
 9         for (int i = 1; i <= 1000; i++) {
10             numbers[i - 1] = i;
11         }
12         Random r = new Random();
13         for (int i = 0; i < 300; i++) {
14             System.out.println(numbers[r.nextInt(1000)] + 
15                     operate[r.nextInt(4)] +
16                     numbers[r.nextInt(1000)] + "=");
17         }
18     }
19 
20 }