com.jdon.util

类 MultiHashMap

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap

com.jdon.util.MultiHashMap

所有已实现的接口:

Serializable, Cloneable, Map

public class MultiHashMap
extends HashMap

MultiHashMap is a extension java.util.HashMap.It is usde if following condition.
Sometime, a value shoud be determinated by key and subkey.

另请参阅:

序列化表格

嵌套类概要

从类继承的嵌套类/接口 java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

从接口继承的嵌套类/接口 java.util.Map

Map.Entry<K,V>

构造器概要

构造器

构造器和说明
MultiHashMap()

方法概要

限定符和类型	方法和说明
Object	get(Object key, Object subKey) Returns the value to which this map maps the specified key and subKey.
Set	getSubKeys(Object key)
Object	put(Object key, Object subKey, Object value) Associates the specified value with the specified key and subKey in this map.

从类继承的方法 java.util.HashMap

clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

从类继承的方法 java.util.AbstractMap

equals, hashCode, toString

从类继承的方法 java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

从接口继承的方法 java.util.Map

equals, hashCode

构造器详细资料

MultiHashMap

public MultiHashMap()

方法详细资料

put

public Object put(Object key,
                  Object subKey,
                  Object value)

Associates the specified value with the specified key and subKey in this map. If the map previously contained a mapping for this key and subKey , the old value is replaced.

参数:

key - Is a Primary key.

subKey - with which the specified value is to be associated.

value - to be associated with the specified key and subKey

返回:

previous value associated with specified key and subKey, or null if there was no mapping for key and subKey. A null return can also indicate that the HashMap previously associated null with the specified key and subKey.

get

public Object get(Object key,
                  Object subKey)

Returns the value to which this map maps the specified key and subKey. Returns null if the map contains no mapping for this key and subKey. A return value of null does not necessarily indicate that the map contains no mapping for the key and subKey; it's also possible that the map explicitly maps the key to null. The containsKey operation may be used to distinguish these two cases.

参数:

key - whose associated value is to be returned.

subKey - whose associated value is to be returned

返回:

the value to which this map maps the specified key.

getSubKeys

public Set getSubKeys(Object key)