Categorized list of Collection interface methods

Collection interface methods categorized:

Boolean	add(E o)	Methods to add elements to collection
Boolean	addAll(Collection<? Extends E> c)
Void	Clear()	Methods to remove elements from collection
Boolean	remove(Object o)
Boolean	removeAll(Collection<?> c)
Boolean	retainAll(Collection<?> c)
Boolean	contains(Object o)	Methods to check if specific element(s) exist in collection.
Boolean	containsAll(Collection<?> c)
Boolean	IsEmpty()	Methods to check collection at a higher level
Int	Size()
Iterator<E>	Iterator()	Methods to transform the whole collection to other representations
Object[]	ToArray()
<T> T[]	toArray(T[] a)