Question

//Scanner
        Scanner scan = new Scanner(System.in);

        //Variables
        double bmi;                        // Body Mass Index
        double weight;                     // Weight in kilograms
        double height;                     // Height in meters
        String[] classification = {"Underweight", "Normal", "Overweight", "Obese"};

        System.out.print("Your weight in KG \n");
        weight = scan.nextDouble();
        System.out.print("Enter height in meters: \n");
        height = scan.nextDouble();
        bmi = weight / (height * height);

        if (bmi < 18.5) {
            System.out.print("You're " + classification[0] + "\n");
        } else if (bmi < 25) {
            System.out.print("You're " + classification[1] + "\n");
        } else if (bmi < 30) {
            System.out.print("You're " + classification[2] + "\n");
        } else {
            System.out.print("You're " + classification[3] + "\n");
        }

        switch (Arrays.toString(classification)) {
            case "Underweight":
                System.out.println("Underweight");
                break;
            case "Normal":
                System.out.println("Normal");
                break;
            case "Overweight":
                System.out.println("A bit overweighted");
                break;
            case "Obese":
                System.out.println("A bit obese");
                break;
            default:
                System.out.println("Ok");
                break;
        }
    }

输出，我的switch语句在if-else语句之后不起作用。它忽略所有内容，直接跳到我的交换机中的默认值。我的意图是在if-else之后再跟一些文字。因此，基本上，如果我的计算表明我超重了，那么现在我的switch语句必须跳转到“超重”情况并打印出那段代码。.我在做什么错？

Answer 1

Arrays.toString(classification)的结果为[体重不足，正常，体重超重，肥胖]与任何切换情况都不匹配。

解决方案可能是这样的：

String result = null;
if (bmi < 18.5) {
        System.out.print("You're " + classification[0] + "\n");
        result = classification[0];
    } else if (bmi < 25) {
        System.out.print("You're " + classification[1] + "\n");
        result = classification[1];
    } else if (bmi < 30) {
        System.out.print("You're " + classification[2] + "\n");
        result = classification[2];
    } else {
        System.out.print("You're " + classification[3] + "\n");
        result = classification[3];
    }

    switch (result) {
        case "Underweight":
            System.out.println("Underweight");
            break;
        case "Normal":
            System.out.println("Normal");
            break;
        case "Overweight":
            System.out.println("A bit overweighted");
            break;
        case "Obese":
            System.out.println("A bit obese");
            break;
        default:
            System.out.println("Ok");
            break;
    }

我的if-else语句之后，switch语句将被忽略

1 个答案: