Java方法代码错误

Question

我试图对第二个返回方法进行两次调用，该方法接受一个参数(我的值以英寸为单位)并打印以厘米为单位的值，但它不起作用!我做错了什么？`

public static void main(String[] args) {
     Scanner in = new Scanner(System.in);

     // prompt the user and get the value
     System.out.print("Exactly how many inches are you?  ");
     int uHeight = in.nextInt();

    // converting and outputing the result
    System.out.print("How many inches is your mother? ");
    int mHeight = in.nextInt();
    InchesToCm(mHeight,uHeight);
}  

public static double InchesToCm() {


Scanner in = new Scanner(System.in);
System.out.print("Exactly how many inches are you?  ");
int inHeight = in.nextInt();
double cmHeight = inHeight * 2.54;
System.out.println("He's " + uHeight + " inches or " + mHeight + " cm.");
return

Answer 1

您应该在方法中传递 mHeight 和 uHeight，因为您在主方法中调用它，如下所示 InchesToCm(mHeight,uHeight); 所以您的方法应如下所示:

public static double InchesToCm(int mHeight, int uHeight) {//pass your values in method

其次你必须最后返回结果:

return cmHeight;//return the result

<小时/>

注意

为了良好的实践，你的方法应该以小写字母开头，就像 @Timothy Truckle 在评论中所说，你的类名应该以大写字母开头

<小时/>

编辑

为了获得良好的实践，您必须使用:

public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    System.out.print("Exactly how many inches are you?  ");
    int uHeight = in.nextInt();

    System.out.println("He's " + uHeight + " inches or " + inchesToCm(uHeight) + " cm.");
    System.out.print("How many inches is your mother? ");

    int mHeight = in.nextInt();
    System.out.println("He's " + mHeight + " inches or " + inchesToCm(mHeight) + " cm.");
    //------------------------------^^-------------------------------^^------------------
    in.close();//close your Scanner
}

//Your function should take inches and return cm
public static double inchesToCm(int height) {
    return height * 2.54;
}