arrays - next() vs nextLine() in JAVA

I was trying to take input for the number of names to be stored in an array from user and then using that i was taking names from the user ,first i tried to take names from the user using next() method and all the things were fine but when i tried to take input using nextLine() method the output was as shown below

package learningJava;
import java.util.Scanner;

public class practice
{

    public static void main(String[] args)
    {
        int n;
        Scanner obj = new Scanner(System.in);
        System.out.println("Enter the number of names you are gonna enter");
        n = obj.nextInt();

        String names[] = new String[n];
        for(int i=0;i        {

            System.out.println("Enter the name of friend "+(i+1));
            names[i]=obj.nextLine();
        }
        obj.close();
        System.out.println("Names of your friends are");
        for(int i=0;i        {
            System.out.println(names[i]);
        }
    }

}

Output for the nextLine() method

Enter the number of names you are gonna enter
5
Enter the name of friend 1
Enter the name of friend 2

It is not prompting me to enter the name of friend 1 and directly skipping it and coming to the friend 2 line.
I am beginner in Java , i know the basic difference in next and nextLine() that next() doesn't take input after a space but nextLine() takes complete input , So what is happening here ??