[Tutorial] Command Line Arguments In Java With Example!

Tutorials & Methods
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What is the Command Line Argument?

Command Line Argument is information passed to the program when you run the program. The passed information is stored as a string array in the main method. Later, you can use the command line arguments in your program.

Example While running a class Demo, you can specify command-line arguments as

java Demo arg1 arg2 arg3 …

Command Line Arguments in Java: Important Points

  • Command Line Arguments can be used to specify configuration information while launching your application.
  • There is no restriction on the number of java command line arguments. You can specify any number of arguments
  • Information is passed as Strings.
  • They are captured into the String args of your main method

Example: To Learn java Command Line Arguments

Step 1) Copy the following code into an editor.

class Demo{
     public static void main(String b[]){
         System.out.println("Argument one = "+b[0]);
         System.out.println("Argument two = "+b[1]);
    }
}

Step 2) Save & Compile the code

Step 3) Run the code as java Demo apple orange.

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Step 4) You must get an output as below.

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ENJOY & HAPPY LEARNING! :+1:

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I always used to mess up between args[0],args[1] (here b[0],b[1]),
as in c/c++ & python arg[0] was program name followed by arguments :sweat_smile:

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