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Java : Command Line Arguments

Tutorial by:Arena Buocel      Date: 2016-04-30 00:20:37

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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.
 
  1. class CommandLineExample{  
  2. public static void main(String args[]){  
  3. System.out.println("Your first argument is: "+args[0]);  
  4. }  
  5. }  
 
  1. compile by > javac CommandLineExample.java  
  2. run by > java CommandLineExample sonoo  
Output: 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.
 
  1. class A{  
  2. public static void main(String args[]){  
  3.   
  4. for(int i=0;i<args.length;i++)  
  5. System.out.println(args[i]);  
  6.   
  7. }  
  8. }  
 
  1. compile by > javac A.java  
  2. run by > java A sonoo jaiswal 1 3 abc  
Output: sonoo
       jaiswal
       1
       3
       abc
      

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