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Command Line arguments in Java

  • Difficulty Level : Easy
  • Last Updated : 09 Aug, 2018
Geek Week

If we run a Java Program by writing the command “java Hello Geeks At GeeksForGeeks” where the name of the class is “Hello”, then it will run upto Hello. It is command upto “Hello” and after that i.e “Geeks At GeeksForGeeks”, these are command line arguments.

When command line arguments are supplied to JVM, JVM wraps these and supply to args[]. It can be confirmed that they are actually wrapped up in args array by checking the length of args using args.length

// Program to check for command line arguments
class Hello
    public static void main(String[] args)
        // check if length of args array is
        // greater than 0
        if (args.length > 0)
            System.out.println("The command line"+
                               " arguments are:");
            // iterating the args array and printing
            // the command line arguments
            for (String val:args)
            System.out.println("No command line "+
                               "arguments found.");

Output :

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