How HashMap works in java,强烈推荐! (之前看了这篇文章感觉真的太好了,有种自己不用写了感觉。所以这篇博文最主要的目的是总结下HashMap的特点。和这篇文章的debug思路)
方法一:通过Collections.synchronizedMap()返回一个新的Map,这个新的map就是线程安全的. 这个要求大家习惯基于接口编程,因为返回的并不是HashMap,而是一个Map的实现. 方法二:使用java.util.concurrent.ConcurrentHashMap. 这个方法比方法一有了很大的改进. ConcurrentHashMap的详细解析请看其他文章。 回到顶部(go to to...
本课程是Java Collections Framework的成员。从以下版本开始: 1.4 另请参见: System.identityHashCode(Object), Object.hashCode(), Collection, Map, HashMap, TreeMap, Serialized Form 嵌套类汇总 嵌套类/接口声明在类 java.util.AbstractMap AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<...
List是有序的Collection,使用此接口能够精确的控制每个元素插入的位置。用户能够使用索引(元素在List中的位置,类似于数组下标)来访问List中的元素,这类似于Java的数组。 和下面要提到的Set不同,List允许有相同的元素。 除了具有Collection接口必备的iterator()方法外,List还提供一个listIterator()方法,返回一个ListIterat...
The iterators returned by the iterator method of the collections returned by all of this class's collection view methods are <em>fail-fast</em>: if the map is structurally modified at any time after the iterator is created, in any way except through the iterator's own remove ...
This class is a member of theJava Collections Framework. Since: 1.2 See Also: Object.hashCode(),Collection,Map,TreeMap,Hashtable,Serialized Form Nested Class Summary Nested classes/interfaces declared in class java.util.AbstractMap AbstractMap.SimpleEntry<K,V>,AbstractMap.SimpleImmutableEntry<K,...
This class is a member of theJava Collections Framework. 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. ...
This class is a member of theJava Collections Framework. Added in 1.4. Java documentation forjava.util.LinkedHashMap. Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attributio...
Iteration over collection views ofLinkedHashMapalso takes linear timeO(n)similar to that ofHashMap. On the flip side,LinkedHashMap‘s linear time performance during iteration is better thanHashMap‘s linear time. This is because, forLinkedHashMap,ninO(n)is only the number of entries in the ...
The putAll method generates one entry access for each mapping in the specified map, in the order that key-value mappings are provided by the specified map's entry set iterator. No other methods generate entry accesses. In particular, operations on collection-views do not affect the order of ...