Although you can check out the books on Collections for time being I can tell you.
An Array is a "special" object in Java that has very few methods. You can access the value in the array the [ ] brackets, and you can determine the length (the .length) property, and thats about the extent of the Array. The array has a FIXED size that cannot be changed.
The ArrayList is part of the Collections Framework. It is a List that is built on top of an array. It provides methods to add to the list (thereby changing the size), as well as to obtain an iterator, and to remove elements, sort elements, and perform searches. Basically, it saves you from having to write that code when using an array.
The LinkedList is also a List. It essentially provides the same methods as the ArrayList, except the underlying data structure uses objects that contain references to other objects to form a list. This is "similar" to the concept other languages call "pointers" (but not quite the same).
I hope I make it clear you.
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