Question

我想知道这个节目吗？是否可以组合使用else和switch？我认为这可能是为什么如果没有从代码中删除逻辑OR，程序的最后一部分不能从发生的错误中运行。

public static void main(String[] args) {
    int houseType;
    int hourHome;

    Scanner input = new Scanner(System.in);
    System.out.println("Please select your type of residence: ");
    System.out.println("Press 1 for an apartment");
    System.out.println("Press 2 for a house");
    System.out.println("Press 3 for a dormitory");
    houseType = input.nextInt();

    switch (houseType) {
        case 1:
            System.out.println("You entered you reside in an apartment");
            break;
        case 2:
            System.out.println("You entered you reside in a house");
            break;
        case 3:
            System.out.println("You entered you reside in a dormitory");
            break;
        default:
            System.out.println("You have entered an invalid selection");
            break;
    }
    Scanner input2 = new Scanner(System.in);
    System.out.println("Please select the average number of hours you're home per day ");
    System.out.println("Press 1 for 18 hours or more");
    System.out.println("Press 2 for 10 to 17 hours");
    System.out.println("Press 3 for 8 to 9 hours");
    System.out.println("Press 4 for 6 to 7 hours");
    System.out.println("Press 5 for 0 to 5 hours");
    hourHome = input.nextInt();

    switch (hourHome) {
        case 1:
            System.out.println("You entered you are home for 18 hours per day or more");
            break;
        case 2:
            System.out.println("You entered you are home between 10 and 17" +
                    "hours per day");
            break;
        case 3:
            System.out.println("You entered you are home between 8 and 9 hours per day");
            break;
        case 4:
            System.out.println("You entered you are home between 6 and 7 hours per day");
            break;
        case 5:
            System.out.println("You entered you are home between 0 and 5 hours per day");
            break;
        default:
            System.out.println("You have entered an invalid selection");
            break;
    }
    if (houseType == 1 && hourHome == 1) {
        System.out.println("Based on your selections, it's recommended you get pot-bellied pig");
    } else if (houseType == 1 && hourHome == 2) {
        System.out.println("Based on your selections, it's recommended you get a dog");
    } else

        if (houseType == 1 && ((hourHome == 3 || 4 || 5)) {
            System.out.println("Based on your selections, it's recommended you get a snake");

        }
}

Answer 1

问题不在于使用switch语句和if语句。这没什么不对。

您在此处有错误：

(hourHome == 3 || 4 || 5)

4和5不是布尔表达式，不能像这样使用。你可能意味着：

(hourHome == 3 || hourHome == 4 || hourHome == 5)

Answer 2

您需要在代码中更改一些内容

变化：

hourHome = input.nextInt();

为：

hourHome = input2.nextInt();

变化：

(hourHome == 3 || 4 || 5)

到：

else if (houseType == 1 && ((hourHome == 3 || hourHome == 4 || hourHome    == 5))){

是的，你可以在switch语句中嵌入if / else。

您还可以将单个扫描仪用于hourHome和houseType

切换和如果合并

2 个答案: