LinkedList底层使用的是双向链表数据结构(JDK1.6 之前为循环链表,JDK1.7 取消了循环)。 ArrayList 源码解析 java public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable { transient Object[] elementData; // non-private to simplify nested class a...
Iteration over a LinkedHashSet requires time proportional to the size of the set, regardless of its capacity. Iteration over a HashSet is likely to be more expensive, requiring time proportional to its capacity. Thus LinkedHashSet may provide better performance than HashSet while iteration. 8. ...
java基础---19---List\ArrayList\LinkedList、Set\HashSet\LinkedHashSet List:有序、索引、可以重复 List的特有方法:与索引相关的add\set\remove 迭代器的并发修改异常:在取元素的同时,继续往里面添加元素(下面包异常) 数组查询快,增删慢;链表查询慢,增删快 ArrayList:增删慢,查询快 LinkedList:增删快,查询慢 L...
public synchronized Collection<Map.Entry<K,V>> getAll() { return new ArrayList<Map.Entry<K,V>>(map.entrySet()); } } // end class LRUCache --- // Test routine for the LRUCache class. public static void main (String[] args) { LRUCache<String,String> c = new LRUCache<String, St...