A good answer might be:

Five times.

Input Loop

You don't have to have five statements using readLine(); a loop can be used to execute it the required number of times. Here is a program that reads and echos the first five lines of a file: 
import java.io.*;

class MultiEcho
{
  public static void main ( String[] args ) throws IOException
  {
    String line;
    BufferedReader stdin = new BufferedReader( 
        new InputStreamReader( System.in ) );

    int count = 1;
    while ( count <= 5 )
    {
      System.out.println("Enter line" + count + ": ");
      line = stdin.readLine();
      System.out.println( "You typed: " + line );
      count = count + 1;
    }
  }
}

Here is the program working with an input file: 

C:\users\default\JavaLessons>java MultiEcho < input.txt
Enter line1:
You typed: This is line one,
Enter line2:
You typed: this is line two,
Enter line3:
You typed: this is line three,
Enter line4:
You typed: this is line, uh... four,
Enter line5:
You typed: and this is the last line.

D:\users\default\JavaLessons>

QUESTION 6:

(Thought question: ) How would you send the output of this program to another file?

Click Here after you have answered the question