Need help to modify java code for my requirements

Need help to modify java code for my requirements

References

Reference NO 1

http://stackoverflow.com/questions/15196625/need-help-to-modify-java-code-for-my-requirements

Reference NO 2

http://stackoverflow.com/questions/13635658/need-help-fixing-my-code-java-converting-lettered-phone-numbers-into-their-full

Reference NO 3

http://www.javacodegeeks.com/2012/09/help-my-code-isnt-testable-do-i-need-to.html

Reference NO 4

http://www.daniweb.com/software-development/java/threads/378354/need-help-with-my-inventory-program-and-coding-buttons

Reference NO 5

http://www.coderanch.com/t/602519/java/java/Table-java-file-work-AnnualCompensation

Reference NO 6

https://blogs.oracle.com/jmxetc/entry/connecting_scenebuilder_edited_fxml_to

Reference NO 7

http://www.apl.jhu.edu/~hall/java/beginner/settingup.html

Reference NO 8

http://www.horstmann.com/bigj/help/compiler/tutorial.html