能自动生成30道小学四则运算题目

import java.util.Random;
public class Math {

    public static void main(String[] args) {
        Random r = new Random();
        int i=0;
        for(i=0;i<30;i++)
        {
        int i1 = r.nextInt(100);
        int i2 = r.nextInt(100);
        int t = r.nextInt(100)%4;
        switch(t)
        {
            case 0:System.out.println(i1+"+"+i2+"=");break;
            case 1:System.out.println(i1+"-"+i2+"=");break;
            case 2:System.out.println(i1+"*"+i2+"=");break;
            case 3:System.out.println(i1+"/"+i2+"=");break;
        }
        System.out.println(" ");
    }
}
}

 能自动生成30道小学四则运算题