What is the use of args in Java?

The interesting use of args in Java.

The meaning of each word !

args[ ] is an array of string objects, yep you already read that on top !

now you can add some args in your project by going to Run > Run configurations > Arguments >Insert your values.

As you see in the Picture i puted 3 Arguments one String and the other two as and integer, i can put more of course.

But i want to show you how will i get thoses args in my code and how can i turn a string args to an integer ?

As an answer to getting the args to my code it is simple by doing like this : args[0] instead of 0 mention the index you want.

And to turn a string args to an integer use this : Integer.parseInt(args[0]) also specify the index you want.

public static void main (String[] args) {
System.out.println(" The First argument "+args[0]); // Ahed
System.out.println(" The second argument "+args[1]); // 22
System.out.println(" the first letter of the first argument  "+args[0].charAt(0)); //A
System.out.println(" the second letter of the first argument"+args[0].charAt(1)); //h
// converting from string to integer
int a = Integer.parseInt(args[1]); // a = 22
int b = Integer.parseInt(args[2]); // b = 23
int somme=a+b; // Somme = 22+23
// for example this will be the result of a+b
System.out.println("Somme : "+somme); // Somme : 45
// converting from string to Float
float f =Float.parseFloat(args[2]); // f = 23.0
System.out.println("Float : "+f); // Float : 23.0
// This will also show you the argument caracter by caracter.
// PS : we choose the first argument  args[0] which is Ahed
for(int i=0; i<args[0].length(); i++)
{ // returns the character at the specified index in a string.
         System.out.println(args[0].charAt(i));
     }
   }
}

Instead of writing System.out.println(“ ”); each time try to write only sysout then press ctrl + espace same time and you will have the same result.

Hope you like it ✌🏻