Rotated parallelogram collision detection "RPG"

[Revolut1on1ze]

Hello I am in grade 12 programming("ICS4U") and I have decided to create a game in Java for my end term project/exam. I have collected an image off the Internet because I like its perspective. I will be making my own using it as a template. Although I am not very skilled with math and my efforts are outweighed.
Anyways after days of trial and error, I cannot get my collision detection working just right.
I have decided that id post my problem to a forum and hope for the best. :| attached is my entire project RamL.Java is the primary file. Thanks in advance!! I will do my best to return the favor to the forum.