Java 常用集合笔记

自增数组

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ArrayList<Integer>G[]=new ArrayList[N]

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栈

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Stack<Integer> stack=new Stack<Integer>();
boolean empty() 
Object peek( )
Object pop( )
Object push(Object element)
int search(Object element)
返回对象在堆栈中的位置，以 1 为基数。

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队列

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Queue<Integer>que=new LinkedList<Integer>();
add                
offer       
poll         
pollFirst
poolLast

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优先队列

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默认小根堆，有需要自行设置比较器

PriorityQueue<Integer>que=new PriorityQueue<Integer>();

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堆

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HashSet<Integer>set=new HashSet<Integer>
add(Object)
remove(object)
size()
clear()
isEmpty()
contain(object)

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map

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HashMap<Integer,Integer>map=new HashMap<Integer,Integer>
void clear( )
Object clone( )
boolean contains(Object value)
boolean containsKey(Object key)
boolean containsValue(Object value)
Object get(Object key)
Object put(Object key, Object value)

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双端队列

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LinkedList qmax=new LinkedList<Integer>();
void clear( )
int peekFirst();
int peekLast();
int pollFirst();
int pollLast();
int addFirst(Object o);
int addLast(Object o);

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