• In Java, command line argument is an argument i.e passed at the time of java program run.

• In main method there is a single dimension array of String type, that we use to take arguments.

• You can pass N (1,2,3 and so on) numbers of arguments from the command prompt.

Example :

In below example, we are receiving only one argument and print the value.

public class CommandLineDemo
{
  public static void main(String []ar)
  {
    String arg1 = ar[0]; 
   System.out.println("Argument is: "+arg1);  
  }  
}           

COMPILE : javac CommandLineDemo.java
RUN : java CommandLineDemo JavaProwess 

[ OUTPUT ]

JavaProwess

Example :

class CommandLineDemo
{  
  public static void main(String []ar)
{  
  for(int i=0;i< ar.length;i++) 
     System.out.print(ar[i]+" ");  
 }  
}          

COMPILE : javac CommandLineDemo.java
RUN : java CommandLineDemo C C++ and Java Prowess 

[ OUTPUT ]

C C++ and Java Prowess