java循环产生随机数并筛选30岁以上且40岁以下的年龄
public static void main(String[] args) {
int age = (int) (1 + Math.random() * (120 - 1 + 1));
int i = 1;
while (age >= 30 && age <= 40) {
age = (int) (1 + Math.random() * (120 - 1 + 1));
i++;
}
System.out.println(age + " , " + i);
}