Need Help for Computer Science, Data Structure Java Coding Assignment

I posted whole package here for my coding assignment.

Because I got poor grade from first two assignments, I really need to get better grade on this project.

Assignment Instruction is also posted as document file. Testing Input and output values are listed in that document file. I hope you to test compiling to see if there is compile error.

The thing that I need to working on is Tree.java file. You will see the empty part, which says /** complete this method **/. These areas are the only parts that needed to be completed. You must not change any other codes except for /** complete this method **/.

I after finishing it I just need completed Tree.java file. I am also going to study with completed version, so I want the codes as easy as possible.

Thank you for your help,

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