Command Line Argument





  • 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);  
  }  
}           
OUTPUT : To run this program you have to pass at-least one argument, otherwise you will get exception.
COMPILE : javac CommandLineDemo.java
RUN : java CommandLineDemo JavaProwess 

[ OUTPUT ]

JavaProwess

Example :

In this example, we will take N numbers of argument and print all value,
Remember, after every space runtime will indexed the argument for array.
class CommandLineDemo
{  
  public static void main(String []ar)
{  
  for(int i=0;i< ar.length;i++) 
     System.out.print(ar[i]+" ");  
 }  
}          
OUTPUT :
COMPILE : javac CommandLineDemo.java
RUN : java CommandLineDemo C C++ and Java Prowess 

[ OUTPUT ]

C C++ and Java Prowess

Next topic is Input/Output




 

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