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Thread: sdtin/command-line

  1. #1
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    Default sdtin/command-line

    I hope this is the right board to post this query on.

    I am really new to Java and am struggling to differentiate between reading from stid and taking output from command line in putting it into a method input.

    Where a command line would give the output of 6 integers, ie: 26, 62, 82, 27, 0, 0
    and the opening of a method would be:

    int main (int firstNum, int secondNum, int thirdNum, int fourthNum, int fifthNum, int sixthNum)

    I would not know how to read the same numbers from stdin in a format such as:
    26 62
    82 27
    0 0

    Let alone taking these and inputting them into a method.

    I have tried searching for a good introduction for this, yet have failed to find something that explains the difference effectively.

    Again, I apologise if this is the wrong board, I only just started learning java as a hobbie this summer and it's all very new to me.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: sdtin/command-line

    stdin in Java is routed to the input stream System.in
    The easiest way I know to read from stdin is use a Scanner object.

    public static void main(String[] args)
    {
        Scanner reader = new Scanner(System.in);
        int num1 = reader.nextInt();
        System.out.println("num1 = " + num1);
    }

    I'd recommend reading the The Java™ Tutorials, starting with the Covering the Basics section.

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