java - Do-While 循环在程序运行时连续打印

Question

我的程序中使用了以下代码:

do {
    if (numOfItems == 3 || numOfItems == 5 || numOfItems == 7 || numOfItems == 9) {
        addItems(numOfItems);

    } else {
        System.out.println("That number is out of range.");
        System.out.println("Please choose an odd number in the range of [1, 10] exclusively:");
        numOfItems = scan.nextInt();
    }
} while (numOfItems != 3 || numOfItems != 5 || numOfItems != 7 || numOfItems != 9);

它在运行时不断重复我只想发生一次的方法。如何使循环不断重复以进行验证，但只运行该方法一次？

Answer 1

替换

while (numOfItems != 3 || numOfItems != 5 || numOfItems != 7 || numOfItems != 9);

与

while (numOfItems != 3 && numOfItems != 5 && numOfItems != 7 && numOfItems != 9);

更新

从您的评论到答案，您似乎需要执行以下操作:

do {
    numOfItems = scan.nextInt();
    if (numOfItems == 3 || numOfItems == 5 || numOfItems == 7 || numOfItems == 9) {
        addItems(numOfItems);

    } else {
        System.out.println("That number is out of range.");
        System.out.println("Please choose an odd number in the range of [1, 10] exclusively:");

    }
} while (numOfItems != 3 && numOfItems != 5 && numOfItems != 7 && numOfItems != 9);

但是，您可以将其优化为如下内容:

while ((numOfItems = scan.nextInt() != 3) && numOfItems != 5 && numOfItems != 7 && numOfItems != 9) {

            System.out.println("That number is out of range.");
            System.out.println("Please choose an odd number in the range of [1, 10] exclusively:");
}

addItems(numOfItems);