[DUPLICATE] Why do we need to include "String[ ] args" in the main function all the time ?

Answer 1

you need them to pass parameters to the program. In other words args are for command-line arguments.
suppose you create a program called isEqual that needs two commad line arguments.
if you run isEqual program and supply two parameters as below:
java isEqual 5 9
Then
args [0] 》 5
args [1] 》 9
Example to print all command-line parameters
public class Program {
public static void main(String[] args) {
for(int i = 0; i < args.length; i++) {
System.out.println(args[i]);
}
}
}

Answer 2

This makes jvm to underatand calling right method when program has run