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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description boolean
containsKey(Object key)
Returnstrue
if this map contains a mapping for the specified key.Object
get(Object key)
Returns the value to which this map maps the specified key.Object
put(String name, Object value)
Set a named value.void
putAll(Map<? extends String,? extends Object> toMerge)
Adds all the mappings in a givenMap
to thisBindings
.Object
remove(Object key)
Removes the mapping for this key from this map if it is present (optional operation).-
Methods declared in interface java.util.Map
clear, compute, computeIfAbsent, computeIfPresent, containsValue, entrySet, equals, forEach, getOrDefault, hashCode, isEmpty, keySet, merge, putIfAbsent, remove, replace, replace, replaceAll, size, values
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Method Detail
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put
Object put(String name, Object value)
Set a named value.- Specified by:
put
in interfaceMap<String,Object>
- Parameters:
name
- The name associated with the value.value
- The value associated with the name.- Returns:
- The value previously associated with the given name. Returns null if no value was previously associated with the name.
- Throws:
NullPointerException
- if the name is null.IllegalArgumentException
- if the name is empty String.
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putAll
void putAll(Map<? extends String,? extends Object> toMerge)
Adds all the mappings in a givenMap
to thisBindings
.- Specified by:
putAll
in interfaceMap<String,Object>
- Parameters:
toMerge
- TheMap
to merge with this one.- Throws:
NullPointerException
- if toMerge map is null or if some key in the map is null.IllegalArgumentException
- if some key in the map is an empty String.
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containsKey
boolean containsKey(Object key)
Returnstrue
if this map contains a mapping for the specified key. More formally, returnstrue
if and only if this map contains a mapping for a keyk
such that(key==null ? k==null : key.equals(k))
. (There can be at most one such mapping.)- Specified by:
containsKey
in interfaceMap<String,Object>
- Parameters:
key
- key whose presence in this map is to be tested.- Returns:
true
if this map contains a mapping for the specified key.- Throws:
NullPointerException
- if key is nullClassCastException
- if key is not StringIllegalArgumentException
- if key is empty String
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get
Object get(Object key)
Returns the value to which this map maps the specified key. Returnsnull
if the map contains no mapping for this key. A return value ofnull
does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key tonull
. ThecontainsKey
operation may be used to distinguish these two cases.More formally, if this map contains a mapping from a key
k
to a valuev
such that(key==null ? k==null : key.equals(k))
, then this method returnsv
; otherwise it returnsnull
. (There can be at most one such mapping.)- Specified by:
get
in interfaceMap<String,Object>
- Parameters:
key
- key whose associated value is to be returned.- Returns:
- the value to which this map maps the specified key, or
null
if the map contains no mapping for this key. - Throws:
NullPointerException
- if key is nullClassCastException
- if key is not StringIllegalArgumentException
- if key is empty String
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remove
Object remove(Object key)
Removes the mapping for this key from this map if it is present (optional operation). More formally, if this map contains a mapping from keyk
to valuev
such that(key==null ? k==null : key.equals(k))
, that mapping is removed. (The map can contain at most one such mapping.)Returns the value to which the map previously associated the key, or
null
if the map contained no mapping for this key. (Anull
return can also indicate that the map previously associatednull
with the specified key if the implementation supportsnull
values.) The map will not contain a mapping for the specified key once the call returns.- Specified by:
remove
in interfaceMap<String,Object>
- Parameters:
key
- key whose mapping is to be removed from the map.- Returns:
- previous value associated with specified key, or
null
if there was no mapping for key. - Throws:
NullPointerException
- if key is nullClassCastException
- if key is not StringIllegalArgumentException
- if key is empty String
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