java - 如何正确嵌套此 If 语句

Question

我正在捕获用户输入，但将其限制在 1-100 之间。我在正确嵌套此 if 语句时遇到一些困难。目标:用户可以输入1-100之间的任意金额如果没有，则自动设置为 0。我在最后打印结果

    // if statement to restrict use to 1-100
    hatNumber = in.readInt("How many beaver hats would you like?: \n");
    if (hatNumber <= 0 && hatNumber > 100) {
        System.out.println("Hats = " + hatNumber);
    } else {
        hatNumber = 0;
    }
    photoNumber = in.readInt("How many photographs would you like?: \n");
    if (photoNumber <= 0 && photoNumber > 100) {
        System.out.println("Photographs = " + photoNumber);
    } else {
        photoNumber = 0;

        jarNumber = in.readInt("How many Jars of maple syrup?: \n");



    if (jarNumber <= 0 && jarNumber > 100) {
            System.out.println("Jars = " + jarNumber);

        } else {
            jarNumber = 0;
            {

                System.out.println("Hats = " + hatNumber);
                System.out.println("Photographs = " + photoNumber);
                System.out.println("Jars = " + jarNumber);

Answer 1

首先，如果您期望逻辑“用户可以输入 1-100 之间的任何金额，如果没有，则它会自动设置为 0”。您应该更改 if else 检查

if (hatNumber > 0 && hatNumber <= 100) {
        System.out.println("Hats = " + hatNumber);
} else {
        hatNumber = 0;
}

最终代码如下所示。

    hatNumber = in.readInt("How many beaver hats would you like?: \n");
    if (hatNumber > 0 && hatNumber <= 100) {
        System.out.println("Hats = " + hatNumber);
    } else {
        hatNumber = 0;
    }
    photoNumber = in.readInt("How many photographs would you like?: \n");
    if (photoNumber > 0 && photoNumber <= 100) {
        System.out.println("Photographs = " + photoNumber);
    } else {
        photoNumber = 0;
        jarNumber = in.readInt("How many Jars of maple syrup?: \n");
        if (jarNumber > 0 && jarNumber <= 100) {
            System.out.println("Jars = " + jarNumber);
        } else {
            jarNumber = 0;
        }
    }
    System.out.println("Hats = " + hatNumber);
    System.out.println("Photographs = " + photoNumber);
    System.out.println("Jars = " + jarNumber);