Java Command Line Arguments

The command line argument is the argument passed to a program at the time when you run it. To access the command-line argument inside a java program is quite easy, they are stored as string in String array passed to the args parameter of main() method.

class cmd { public static void main(String[] args) { for(int i=0;i< args.length;i++) { System.out.println(args[i]); } } }

Execute this program as java cmd 10 20 30 F:\>javac F:\>java cmd 10 20 30 10 20 30

The java command-line argument is an argument i.e. passed at the time of running the java program.

The arguments passed from the console can be received in the java program and it can be used as an input.

So, it provides a convenient way to check the behavior of the program for the different values. You can pass N (1,2,3 and so on) numbers of arguments from the command prompt.

Simple example of command-line argument in java

In this example, we are receiving only one argument and printing it. To run this java program, you must pass at least one argument from the command prompt.

class CommandLineExample{ public static void main(String args[]){ System.out.println("Your first argument is: "+args[0]); } }

compile by > javac run by > java CommandLineExample sonoo

Your first argument is: sonoo

Example of command-line argument that prints all the values

In this example, we are printing all the arguments passed from the command-line. For this purpose, we have traversed the array using for loop.

class A{ public static void main(String args[]){ for(int i=0;i<args.length;i++) System.out.println(args[i]); } }

compile by > javac run by > java A Rama Pavi 31 36 xyz Rama Pavi 31 36 xyz