📅 最后修改于: 2020-11-14 06:18:27 🧑 作者: Mango
java.util.LinkedHashMap类是Map接口的Hash表和Linked list实现，具有可预测的迭代顺序。以下是有关LinkedHashMap的要点-
该类提供所有可选的Map操作，并允许空元素。
HashMap上的迭代可能会更昂贵。
以下是java.util.LinkedHashMap类的声明-
public class LinkedHashMap
extends HashMap
implements Map
以下是java.util.LinkedHashMap类的参数-
K-这是此映射维护的键的类型。
V-这是映射值的类型。
| Sr.No. | Constructor & Description |
|---|---|
| 1 |
LinkedHashMap() This constructs an empty insertion-ordered LinkedHashMap instance with the default initial capacity (16) and load factor (0.75). |
| 2 |
LinkedHashMap(int initialCapacity) This constructs an empty insertion-ordered LinkedHashMap instance with the specified initial capacity and a default load factor (0.75). |
| 3 |
LinkedHashMap(int initialCapacity, float loadFactor) This constructs an empty insertion-ordered LinkedHashMap instance with the specified initial capacity and load factor. |
| 4 |
LinkedHashMap(int initialCapacity, float loadFactor, boolean accessOrder) This constructs an empty LinkedHashMap instance with the specified initial capacity, load factor and ordering mode. |
| 5 |
LinkedHashMap(Map m) This constructs an insertion-ordered LinkedHashMap instance with the same mappings as the specified map. |
| Sr.No. | Method & Description |
|---|---|
| 1 | void clear()
This method removes all of the mappings from this map. |
| 2 | boolean containsValue(Object value)
This method returns true if this map maps one or more keys to the specified value. |
| 3 | V get(Object key)
This method returns the value to which the specified key is mapped, or null if this map contains no mapping for the key. |
| 4 | protected boolean removeEldestEntry(Map.Entry This method returns true if this map should remove its eldest entry. |
此类从以下类继承方法-