JAVA EE: Java Tutorial: Command line arguments in java[How to convert command line arg into an int value]

Wednesday, 3 May 2017

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Echo.java

public class Echo
{
    public static void main(String[] args)
    {
        int value;
        try
        {
            /*
             * Converts a command-line argument to an int.
             * 
             * All of the Number classes — Integer, Float,
             * Double, and so on — have parseXXX methods
             * that convert a String representing a number
             * to an object of their type.
             */
            value = Integer.parseInt(args[0]);
            System.out.println(value);
        }
        catch (NumberFormatException e)
        {
            System.err.println("Argument " + args[0] + " must be an integer.");
        }
    }
}