The text file greeks.txt contains a single word on each line.

This program reads the file line by line and prints all the lines with four characters.

Note that the end-of-line character is not included in the count.

• The BufferedReader represents a text file that can process one line at a time.
• We need a FileReader to create the BufferedReader.
• We use the readLine method to obtain a single line of text.
• When the file has been exhausted the string returned will be null.