Java Command line Arguments (CLA)

In java programming, sometimes we want to pass information into a program during run time. We can do so by using command line argument.

All command line argument are passed as string.

CLA are stored as string in string array passed to the args parameter of main(). The first CLA is stored at args[0], the second at args[1] and so on.

Example: Display all command line argument.

public class CommandLineArgument {

    public static void main(String args[]) {
            System.out.println("  args[0] = " + args[0]);
            System.out.println("  args[1] = " + args[1]);
            System.out.println("  args[2] = " + args[2]);
            System.out.println("  args[3] = " + args[3]);
            System.out.println("  args[4] = " + args[4]);
            System.out.println("  args[5] = " + args[5]);
        }
    }

public class CommandLineArgument {

public static void main(String args[]) {

System.out.println(" args[0] = " + args[0]);

System.out.println(" args[1] = " + args[1]);

System.out.println(" args[2] = " + args[2]);

System.out.println(" args[3] = " + args[3]);

System.out.println(" args[4] = " + args[4]);

System.out.println(" args[5] = " + args[5]);

}

Command Line argument

>javac CommandLineArgument.java
> java CommandLineArgument Ram Mohan Sohan Ramesh Ritu Nitu

1 2	>javac CommandLineArgument.java > java CommandLineArgument Ram Mohan Sohan Ramesh Ritu Nitu

Result

args[0] = Ram
  args[1] = Mohan
  args[2] = Sohan
  args[3] = Ramesh
  args[4] = Ritu
  args[5] = Nitu

args[0] = Ram

args[1] = Mohan

args[2] = Sohan

args[3] = Ramesh

args[4] = Ritu

args[5] = Nitu