验证用户输入时，运算符未定义

Question

ages= new int[num];
    genders = new String[num];
    emails = new String[num];
    salaries = new double[num];

    for (int i = 0; i < num; i++) {
        System.out.print("Please enter your age for person "+(i+1)+": ");
        ages[i] = in.nextInt();
        if (ages<20 ||ages>30){
            System.out.println("invalid age please re enter again");
            ages[i] = in.nextInt();
        }

大家好我想在这种情况下验证用户输入它的年龄不应低于20且高于30但我得到一个错误说“运算符＆gt;未定义参数类型（s）int [ ]，int“我将不胜感激任何帮助

Answer 1

if (ages < 20 || ages > 30){...}

应该是：

if (ages[i] < 20 || ages[i] > 30) {...}

ages是一个int数组。您可以对此数组的元素应用conditional operators，但不对数组本身应用。