why (Treets [] treets) basically why the lower case treet

Treet[] is the type of the parameter and treets is its name.

I assume your talking about the parameter for the save() method in the Treets class? If so, then for starters, Lars Reimann is correct, it should be "save(Treet[] treets)".

Heres why: Inside those parameter parentheses you are defining what data type you want to use, and what name you want to call it by. in this case we want to use an array of Treet objects, so we use (Treet[]...) to tell it to expect an array of Treets. then we need to name the array so we can use it in the method, so we call it treets. and it looks like this (Treet[] treets).

*The reason it's lower case is to distinguish between the name and the datatype itself. * The name, or reference variable, is just something you use to point to the object your talking about. Some examples: method(DataType referenceVariable), compareTo(Object obj), add(int int1, int int2) <<< notice here that int isn't upper case because an int is a primitive data type, and primitives like int float, double, long, etc are not capitalized. but the Integer class is.