Java Return is Returning Blank

问题:

I'm trying to create a java method that returns the sum of two values x and y. Currently when I run the code, the output isn't returning anything. Is there any way I can get the value to return the sum WITHOUT modifying the "getSum(x,y);" in line 6 while using the return method???

public class ZawMethods2
{
  public static void main(String[] args)
  {
    int x = 7, y = 45; 
    getSum(x,y);
  }
  public static int getSum(int x, int y){
    int sum = x+y; 
    return (sum); 
  }
}

Thank you all in advance!!! I'm still in the beginning stage of coding so I appreciate all the help.

回答1:

Sorry I thought that you are not allowed to modify getSum method. Just add System.out.println(sum); to getSum method.

回答2:

public class ZawMethods2
{
  public static void main(String[] args)
  {
    int x = 7, y = 45; 
    System.out.print(getSum(x,y));
  }
  public static int getSum(int x, int y){
    //no need to create temprory varibale 
    return x+y; 
  }
}

回答3:

Just print it inside the getSum method, before returning:

public static int getSum(int x, int y){
    int sum = x+y; 
    System.out.println(sum);
    return sum; 
}

As mentioned by @Stultuske in the comments. if you want to only print the sum, and never get it. Then just remove the return type and aswell name the method differently for clarification:

public static void printSum(int x, int y){
    System.out.println(x + y);
}

You might even want to introduce a whole new method. Leaving the old getSum all on itself. The new method then delegates and just prints the result returned:

public static void printSum(int x, int y){
    System.out.println(getSum(x, y));
}

回答4:

Actually, you are compiling a program without any output. You have to use something like

System.out.println(getSum(x, y));

Otherwise you wont get any output.

If you modify the main-method like:

    public static void main(String[] args)
    {
        int x = 7, y = 45; 
        int sum = getSum(x,y);
        System.out.println(sum);
    }

you will get the output: 52. In this case you will save the returned Integer in sum and will print a new line to your console. If you want to add some words, you can modify the main like:

public static void main(String[] args)
{
    int x = 7, y = 45; 
    int sum = getSum(x,y);
    System.out.println("The result is" + sum);
}

回答5:

Try This:

public class ZawMethods2
{
    public static void main(String[] args)
    {
        int x = 7, y = 45; 
        System.out.print(getSum(x,y));
    }
    public static int getSum(int x, int y)
    {
        int sum = x+y; 
        return (sum); 
    }
}

This code will resolve your problem very easily.

回答6:

You should store your result in a variable or display a result.

int c = getSum(x,y);

or

System.out.println("The result of the two numbers are " +getSum(x,y);