Please look into the below code:

import java.io.*;

FileReader fr = new FileReader("D:\\JAVA_Projects\\test1.txt");
BufferedReader bfr = new BufferedReader(fr);

/*String x;
while((x=bfr.readLine()) != null)
{
System.out.println(x);
}*/

while(bfr.readLine() != null)
{
System.out.println(bfr.readLine());
}
}

In the above code commented while loop to print the multiple lines from a file is giving me the right output. 

But if I am executing uncommented while loop it is printing only the even num line. There are total 11 lines ina text file.

Attached a screenshot of both the loop.

I want to ask why is it necessary to assign the value of bfr.readline() method to a variable x of string type, why can't I write it directly?