Lexicographical arrangement

[Kartiky14]

import java.util.Scanner;
class selection1
{
public static void main()throws Exception
{
Scanner obj = new Scanner(System.in);
System.out.println("Enter the number of elements-->>");
int n = obj.nextInt();
String a[]= new String[n];
for(String fz:a)
fz=obj.nextLine();
for(int i =0; i<a.length ;i++)
{
for(int j = i+1;j<a.length;j++)
{
if(a[i].compareTo(a[j])>0)
{
String temp = a[i];
a[i] = a[j];
a[j] = temp;


}
}
}
for(String o:a)
System.out.println(o);
}
}
A Null pointer Exception occurs.....!!! Please resolve !!

[gauravfzd]

In which line?

[JosAH]

What are the String values stored in the array?

kind regards,

Jos