Comparison of the LRU cache framework in the Java class library and other cache framework

LRU (recently used) cache framework is a commonly used cache mechanism to improve the performance and response speed of the application.Compared with other cache frames, the LRU cache frame has the following characteristics: simple, easy to use, efficient and reliable, and space optimization. 1. Simple and easy to use: The LRU cache framework provides a simple and easy -to -understand cache strategy.According to the least recently used principles, it retains the recent cache objects in memory, while the objects that are not used often are replaced.This strategy enables developers to easily integrate and use the LRU cache framework. 2. High -efficiency and reliable: The LRU cache frame uses the data structure of a two -way linked list and the hash table to improve the efficiency of cache access.The two -way linked list is used to maintain the access order of the cache object, so that the recently used objects are always located at the head of the linked list.The hash table is used to quickly locate the position of the cache object to improve the speed of the search object.This combined data structure makes the LRU cache frame have high efficiency and reliability. Below is an example of a simple LRU cache framework implemented using Java: java import java.util.LinkedHashMap; import java.util.Map; public class LRUCache<K, V> extends LinkedHashMap<K, V> { private static final int DEFAULT_CAPACITY = 100; private final int cacheCapacity; public LRUCache() { this(DEFAULT_CAPACITY); } public LRUCache(int capacity) { this.cacheCapacity = capacity; } @Override protected boolean removeEldestEntry(Map.Entry<K, V> eldest) { return size() > cacheCapacity; } } In this example, we use HashMap and Linkedhashmap as the basic data structure that implements the LRU cache.LinkedhashMap maintains a two -way linked list internally, and its iterative order is from the last to the longest to the longest. By inheriting LinkedhashMap and rewriting the `RemovelDestentry" method, we can limit the cache capacity.In this example, we simply determine whether the cache exceeds the specified capacity. If it exceeds, the longest cache object that has not been accessed is removed.In this way, we realize a simple LRU cache framework. 3. Space optimization: The LRU cache framework is regularly removed by the longest unused cache object to ensure the effective use of memory resources and maximizing the cache hit rate.The characteristics of this space optimization make the LRU cache framework suitable for application scenarios with limited memory space, which can provide better performance and response speed. In summary, the LRU cache framework is a commonly used cache mechanism in the Java class library. It has the characteristics of simple, easy -to -use, efficient and reliable, and space optimization compared to other cache frameworks.Developers can choose the appropriate cache framework according to the specific needs of the application to improve the performance and response speed of the application.