9.11-JZTXT

今天上午洗衣服，下午上课写了一个随机出小学生计算题的代码
import java.util.Random;
public class xxk {
    public static void main(String[] args) {
       for(int i = 0;i<30;i++)
       {
           Random r =new Random();
           int num1 = Random(10,99);
           int num2 = Random(10,99);
           int num3 = Random(1,4);
           if(num3 == 1)
           {
               System.out.println(num1 +" + "+num2+ " = " );
           }
           else if(num3 == 2){
               System.out.println(num1 +" - "+num2+ " = " );
           }
           else if(num3 == 3){
               System.out.println(num1 +" * "+num2+ " = " );
           }
           else {
               System.out.println(num1 +" / "+num2+ " = " );
           }
       }
    }

    public static int Random(int min,int max){
        Random random = new Random();
        int rand = random.nextInt((max-min)+1)+min;
        return rand;
    }
}