» » » Command line arguments

  • The group of strings what we are passing as an argument to the main method from the console or command line are known as command line arguments.
  • Every command line argument would be accepted by the JVM in the form of a String object.
  • JVM will always executes main method by passing object of an array of strings.
  • JVM would never execute main method by passing null
  • JVM always executes main as a thread. 

 

Program on command line arguments:

package com.instanceofjavaforus;

public class CommandLineArguents {

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

  • >javac CommandLineArguent.java

    >java CommandLineArguents

    OutPut:
    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
        at com.instanceofjavaforus.CommandLineArguents.main(CommandLineArguents.java:8)
  • >javac CommandLineArguent.java

    >java CommandLineArguents  instance

    OutPut:
    instance

Instance Of Java

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