Package org.apache.commons.collections
Interface MapIterator
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- All Superinterfaces:
java.util.Iterator
- All Known Subinterfaces:
OrderedMapIterator
- All Known Implementing Classes:
AbstractMapIteratorDecorator
,AbstractOrderedMapIteratorDecorator
,EmptyMapIterator
,EmptyOrderedMapIterator
,EntrySetMapIterator
,UnmodifiableMapIterator
,UnmodifiableOrderedMapIterator
@Deprecated(since="2021-04-30") public interface MapIterator extends java.util.Iterator
Deprecated.Commons Collections 3 is in maintenance mode. Commons Collections 4 should be used instead.Defines an iterator that operates over aMap
.This iterator is a special version designed for maps. It can be more efficient to use this rather than an entry set iterator where the option is available, and it is certainly more convenient.
A map that provides this interface may not hold the data internally using Map Entry objects, thus this interface can avoid lots of object creation.
In use, this iterator iterates through the keys in the map. After each call to
next()
, thegetValue()
method provides direct access to the value. The value can also be set usingsetValue()
.MapIterator it = map.mapIterator(); while (it.hasNext()) { Object key = it.next(); Object value = it.getValue(); it.setValue(newValue); }
- Since:
- Commons Collections 3.0
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Method Summary
All Methods Instance Methods Abstract Methods Deprecated Methods Modifier and Type Method Description java.lang.Object
getKey()
Deprecated.Gets the current key, which is the key returned by the last call tonext()
.java.lang.Object
getValue()
Deprecated.Gets the current value, which is the value associated with the last key returned bynext()
.boolean
hasNext()
Deprecated.Checks to see if there are more entries still to be iterated.java.lang.Object
next()
Deprecated.Gets the next key from theMap
.void
remove()
Deprecated.Removes the last returned key from the underlyingMap
(optional operation).java.lang.Object
setValue(java.lang.Object value)
Deprecated.Sets the value associated with the current key (optional operation).
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Method Detail
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hasNext
boolean hasNext()
Deprecated.Checks to see if there are more entries still to be iterated.- Specified by:
hasNext
in interfacejava.util.Iterator
- Returns:
true
if the iterator has more elements
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next
java.lang.Object next()
Deprecated.Gets the next key from theMap
.- Specified by:
next
in interfacejava.util.Iterator
- Returns:
- the next key in the iteration
- Throws:
java.util.NoSuchElementException
- if the iteration is finished
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getKey
java.lang.Object getKey()
Deprecated.Gets the current key, which is the key returned by the last call tonext()
.- Returns:
- the current key
- Throws:
java.lang.IllegalStateException
- ifnext()
has not yet been called
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getValue
java.lang.Object getValue()
Deprecated.Gets the current value, which is the value associated with the last key returned bynext()
.- Returns:
- the current value
- Throws:
java.lang.IllegalStateException
- ifnext()
has not yet been called
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remove
void remove()
Deprecated.Removes the last returned key from the underlyingMap
(optional operation).This method can be called once per call to
next()
.- Specified by:
remove
in interfacejava.util.Iterator
- Throws:
java.lang.UnsupportedOperationException
- if remove is not supported by the mapjava.lang.IllegalStateException
- ifnext()
has not yet been calledjava.lang.IllegalStateException
- ifremove()
has already been called since the last call tonext()
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setValue
java.lang.Object setValue(java.lang.Object value)
Deprecated.Sets the value associated with the current key (optional operation).- Parameters:
value
- the new value- Returns:
- the previous value
- Throws:
java.lang.UnsupportedOperationException
- if setValue is not supported by the mapjava.lang.IllegalStateException
- ifnext()
has not yet been calledjava.lang.IllegalStateException
- ifremove()
has been called since the last call tonext()
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