CollectionInterface

//----------------------------------------------------------------------------
// CollectionInterface.java        by Dale/Joyce/Weems               Chapter 5
//
// Interface for a class that implements a collection of T.
// A collection allows addition, removal, and access of elements.
//
// Nullelements are not allowed. Duplicate elements are allowed.
//----------------------------------------------------------------------------

public interface CollectionInterface<T> {

   boolean add(T element);
   // Attempts to add element to this collection.
   // Returns true if successful, false otherwise.

   T get(T target);
   // Returns an element e from this collection such that e.equals(target).
   // If no such e exists, returns null.

   boolean contains(T target);
   // Returns true if this collection contains an element e such that
   // e.equals(target); otherwise returns false.

   boolean remove (T target);
   // Removes an element e from this collection such that e.equals(target)
   // and returns true. If no such e exists, returns false.

   boolean isFull();
   // Returns true if this collection is full; otherwise, returns false.

   boolean isEmpty();
   // Returns true if this collection is empty; otherwise, returns false.

   int size();
   // Returns the number of elements in this collection.
}

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