$ java -Xmx128m LongLineDemo line long.txt
mode=line  -Xmx128 MB
OutOfMemoryError: Java heap space
$ java -Xmx128m LongLineDemo chunks long.txt
mode=chunks  -Xmx128 MB
read(char[]) processed 200,000,071 chars, 2,739,727 commas, never holding more than 8192 chars