还记得,上一篇HashMap解析中提到,在HashMap的构造函数中,调用了init方法,而在HashMap中init方法是空实现,但LinkedHashMap重写了该方法,所以在LinkedHashMap的构造方法里,调用了自身的init方法,init的重写实现如下: /** * Called by superclass constructors and pseudoconstructors (clone, * readObject) before any...
linkedHashMap.put("name3","josan3");// LinkedHashMap没有重写该方法,调用的HashMap中的entrySet方法Set<Entry<String,String>>set= linkedHashMap.entrySet();Iterator<Entry<String,String>> iterator =set.iterator();while(iterator.hasNext()) { Entry entry = iterator.next();Stringkey = (String) ...
HashMap是无序的,当我们希望有顺序地去存储key-value时,就需要使用LinkedHashMap了。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Map<String, String> hashMap = new HashMap<String, String>(); hashMap.put("name1", "josan1"); hashMap.put("name2", "josan2"); hashMap.put("name3",...
publicLinkedHashMap(intinitialCapacity, floatloadFactor, booleanaccessOrder) { super(initialCapacity, loadFactor); this.accessOrder = accessOrder; } /** * Called by superclass constructors and pseudoconstructors (clone, * readObject) before any entries are inserted into the map. Initializes * the c...
Java集合框架源码分析之LinkedHashMap详解LinkedHashMap简介LinkedHashMap是HashMap的子类,与HashMap有着同样的存储结构,但它加入了一个双向链表的头结点,将所有put到LinkedHashmap的节点一一串成了一个双向循环链表,因此它保留了节点插入的...
clone,compute,computeIfAbsent,computeIfPresent,containsKey,isEmpty,merge,put,putAll,putIfAbsent,remove,remove,replace,replace,size Methods inherited from class java.util.AbstractMap equals,hashCode,toString Methods inherited from class java.lang.Object ...
Performance is likely to be just slightly below that of HashMap, due to the added expense of maintaining the linked list, with one exception: Iteration over the collection-views of a LinkedHashMap requires time proportional to the size of the map, regardless of its capacity. Iteration over a...
publicclassLinkedHashMap<K,V>extendsHashMap<K,V>implementsMap<K,V> { ... } 成员变量定义 与HashMap相比,LinkedHashMap增加了两个属性用于保证迭代顺序,分别是 双向链表头结点header 和 标志位accessOrder (值为true时,表示按照访问顺序迭代;值为false时,表示按照插入顺序迭代)。
protected native Object clone() throws CloneNotSupportedException; /** * 返回一个对象的字符串表示 * 建议所有类都重写这个方法,因为不直观 * 字符串内容,类名加上hash code转成16进制 */ public String toString() { return getClass().getName() + "@" + Integer.toHexString(hashCode()); ...
*/ @SuppressWarnings("unchecked") private LinkedCaseInsensitiveMap(LinkedCaseInsensitiveMap<V> other) { this.targetMap = (LinkedHashMap<String, V>) other.targetMap.clone(); this.caseInsensitiveKeys = (HashMap<String, String>) other.caseInsensitiveKeys.clone(); this.locale = other.locale; } orig...