LRUCache cache = new LRUCache( 2 /* 缓存容量 */ ); cache.put(1, 1); cache.put(2, 2); cache.get(1); // 返回 1 cache.put(3, 3); // 该操作会使得关键字 2 作废 cache.get(2); // 返回 -1 (未找到) cache.put(4, 4); // 该操作会使得关键字 1 作废 cache.get(1); //...
今天我们来深入探索一下LinkedHashMap的底层原理,并且使用linkedhashmap来实现LRU缓存。 摘要: HashMap和双向链表合二为一即是LinkedHashMap。所谓LinkedHashMap,其落脚点在HashMap,因此更准确地说,它是一个将所有Entry节点链入一个双向链表的HashMap。 由于LinkedHashMap是HashMap的子类,所以LinkedHashMap自然会拥有Ha...
Hash table and linked list implementation of the Map interface, with predictable iteration order. This implementation differs from HashMap in that it maintains a doubly-linked list running through all of its entries. This linked list defines the iteration ordering, which is normally the order in w...
当然,首先并不着急看源码,第一步,需要确认glide源码中的LRU缓存和用LinkedHashMap实现的LRU是不是具有同样的功能,把它的注释看一遍。 ❝ An BitmapPool implementation that uses an LruPoolStrategy to bucket Bitmaps and then uses an LRU eviction policy to evict Bitmaps from the least recently used bucke...
Implementation Note: The spliterators returned by the spliterator method of the collections returned by all of this class's collection view methods are created from the iterators of the corresponding collections. Since: 1.4 See Also: Object.hashCode(),Collection,Map,HashMap,TreeMap,Hashtable,Serializ...
K - the type of keys maintained by this map V - the type of mapped values All Implemented Interfaces: Serializable, Cloneable, Map<K,V> public class LinkedHashMap<K,V> extends HashMap<K,V> implements Map<K,V> Hash table and linked list implementation of the Map interface...
比如,LinkedHashMap也最多只允许一条Entry的键为Null(多条会覆盖),但允许多条Entry的值为Null。此外,LinkedHashMap 也是 Map 的一个非同步的实现。此外,LinkedHashMap还可以用来实现LRU (Least recently used, 最近最少使用)算法,这个问题会在下文的特别谈到。
Image Cache Introduction In this implementation, the image cache is created using Java's LinkedHashMap as a Read Through Cache. It provides a method called as load which behaves as below: Check : will check if the given key is present in the cache, if not present a cache miss is recorde...
//implementation } 2. LinkedHashMap Features The important things to learn about Java LinkedHashMap class are: It stores key-value pairs similar to HashMap. It contains only unique keys. Duplicate keys are not allowed. It may have one null key and multiple null values. It maintains the ord...
利用LinkedHashMap实现Implementation: importjava.util.LinkedHashMap;importjava.util.Map.Entry;publicclassLRUCache<K,V>extendsLinkedHashMap<K,V>{privateintcapacity;// Maximum number of items in the cache.publicLRUCache(intcapacity){super(capacity+1,1.0f,true);// Pass 'true' for accessOrder.this....