List,Stacks,Queues,and Priority QueuesCollections

Collections

collection

storing a collection of elements

• set : store a group of nonduplicate elements.
• list : store an ordered collection of elements.
• stack : store objects that are processed in a last-in,first-out fashion.
• queue : store objects that are processed in a fiest-in,first-out fashion.
• PriorityQueue : store objects that are processed in the order of their priorities.

List

duplicates allowed

common methods

in the List interface

	add(index,element);
	addAll(index,collection);
	remove(index);
	indexOf(element); //obtain the index of the specified element's first occurrence
	lastIndexOf(element);
	subList(fromIndex,toIndex);//obtain the sublist

ArrayList

LinkedList

map

storing key/value pairs

最后

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