#2 #3 #4 Completes 2/3/4 assignments

[bhuwang]

SonarQube analysis reported 7 issues:

• 5 major
• 2 minor

Watch the comments in this conversation to review them. Note: the following issues could not be reported as comments because they are located on lines that are not displayed in this pull request:

• Replace this usage of System.out or System.err by a logger.
• Replace this usage of System.out or System.err by a logger.
• Replace this usage of System.out or System.err by a logger.
• Replace this usage of System.out or System.err by a logger.
• Remove this unused import 'java.util.StringTokenizer'.
• Remove this unused import 'main.java.com.lftechnology.phpjava.one.PublicClass'.
• Add a private constructor to hide the implicit public one.