When do you use varargs in Java?

Question

I\'m afraid of varargs. I don\'t know what to use them for.

Plus, it feels dangerous to let people pass as many arguments as they want.

What\'s an example

Answer 1

Varargs is the feature added in java version 1.5.

Why to use this?

1. What if, you don't know the number of arguments to pass for a method?
2. What if, you want to pass unlimited number of arguments to a method?

How this works?

It creates an array with the given arguments & passes the array to the method.

Example :

public class Solution {



    public static void main(String[] args) {
        add(5,7);
        add(5,7,9);
    }

    public static void add(int... s){
        System.out.println(s.length);
        int sum=0;
        for(int num:s)
            sum=sum+num;
        System.out.println("sum is "+sum );
    }

}

Output :

2

sum is 12

3

sum is 21