Method LRUCache

Java/LRU-Cache.java:16–21

(int capacity)

    Map<Integer, Node> map;
    
    public LRUCache(int capacity) {
        map = new HashMap(capacity);
        this.capacity = capacity;
        head.next = tail;
        tail.prev = head;
    }
    
    public int get(int key) {
        int result =  -1;