completed assignment 7, chapter 5, java programming

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
typo

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
completes assignment 8, chapter 5, java programming

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
indentation error

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
completes (sort of) assignment 9, chapter 5, java programming

Signed-off-by: Alexander Skjolden <alex@plastboks.net>