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Level 155

[No Typing] Collections: TreeMap Class


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TreeMap()
This constructor constructs an empty tree map that will be sorted by using the natural order of its keys
TreeMap(Comparator comp)
This constructor constructs an empty tree-based map that will be sorted by using the Comparator comp.
TreeMap(Map m)
This constructor initializes a tree map with the entries from m, which will be sorted by using the natural order of the keys.
TreeMap(SortedMap sm)
This constructor initializes a tree map with the entries from the SortedMap sm, which will be sorted in the same order as sm:
void clear()
Removes all mappings from this TreeMap.
Object clone()
Returns a shallow copy of this TreeMap instance.
Comparator comparator()
Returns the comparator used to order this map, or null if this map uses its keys' natural order.
boolean containsKey(Object key)
Returns true if this map contains a mapping for the specified key.
boolean containsValue(Object value)
Returns true if this map maps one or more keys to the specified value.
Set entrySet()
Returns a set view of the mappings contained in this map.
Object firstKey()
Returns the first (lowest) key currently in this sorted map.
Object get(Object key)
Returns the value to which this map maps the specified key.
SortedMap headMap(Object toKey)
Returns a view of the portion of this map whose keys are strictly less than toKey.
Set keySet()
Returns a Set view of the keys contained in this map.
Object lastKey()
Returns the last (highest) key currently in this sorted map.
Object put(Object key, Object value)
Associates the specified value with the specified key in this map.
void putAll(Map map)
Copies all of the mappings from the specified map to this map.
Object remove(Object key)
Removes the mapping for this key from this TreeMap if present.
int size()
Returns the number of key-value mappings in this map.
SortedMap tailMap(Object fromKey)
Returns a view of the portion of this map whose keys are greater than or equal to fromKey.
Collection values()
Returns a collection view of the values contained in this map.