java随机生成300道四则运算题

package yunsuan;

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)] + "=");
        }
    }

}