If the map is modified while an iteration over the collection is in progress except through the iterator's own remove operation , the results of the iteration are undefined.
The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator. The set's iterator returns the entries in ascending key order. If the map is modified while an iteration over the set is in progress except through the iterator's own remove operation, or through the setValue operation on a map entry returned by the iterator the results of the iteration are undefined.
The descending map is backed by this map, so changes to the map are reflected in the descending map, and vice-versa. If either map is modified while an iteration over a collection view of either map is in progress except through the iterator's own remove operation , the results of the iteration are undefined. The returned map has an ordering equivalent to Collections. The expression m.
If fromKey and toKey are equal, the returned map is empty unless fromInclusive and toInclusive are both true. The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports. The returned map will throw an IllegalArgumentException on an attempt to insert a key outside of its range, or to construct a submap either of whose endpoints lie outside its range.
Implementations may, but are not required to, throw this exception if fromKey or toKey cannot be compared to keys currently in the map. NullPointerException - if fromKey or toKey is null and this map uses natural ordering, or its comparator does not permit null keys IllegalArgumentException - if fromKey is greater than toKey ; or if this map itself has a restricted range, and fromKey or toKey lies outside the bounds of the range Since: 1.
The returned map will throw an IllegalArgumentException on an attempt to insert a key outside its range. Implementations may, but are not required to, throw this exception if toKey cannot be compared to keys currently in the map. NullPointerException - if toKey is null and this map uses natural ordering, or its comparator does not permit null keys IllegalArgumentException - if this map itself has a restricted range, and toKey lies outside the bounds of the range Since: 1.
Implementations may, but are not required to, throw this exception if fromKey cannot be compared to keys currently in the map. NullPointerException - if fromKey is null and this map uses natural ordering, or its comparator does not permit null keys IllegalArgumentException - if this map itself has a restricted range, and fromKey lies outside the bounds of the range Since: 1. If fromKey and toKey are equal, the returned map is empty. Equivalent to subMap fromKey, true, toKey, false.
Equivalent to headMap toKey, false. Equivalent to tailMap fromKey, true. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Object java. The map is sorted according to the natural ordering of its keys, or by a Comparator provided at map creation time, depending on which constructor is used.
Constructs a new tree map containing the same mappings as the given map, ordered according to the natural ordering of its keys. Constructs a new tree map containing the same mappings and using the same ordering as the specified sorted map.
Returns a key-value mapping associated with the least key greater than or equal to the given key, or null if there is no such key. Returns the least key greater than or equal to the given key, or null if there is no such key. Returns the comparator used to order the keys in this map, or null if this map uses the natural ordering of its keys. Returns true if this map maps one or more keys to the specified value. Returns a reverse order NavigableSet view of the keys contained in this map.
Returns a Set view of the mappings contained in this map. Returns a key-value mapping associated with the least key in this map, or null if the map is empty. Returns a key-value mapping associated with the greatest key less than or equal to the given key, or null if there is no such key.
Returns the greatest key less than or equal to the given key, or null if there is no such key. Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key. Returns a view of the portion of this map whose keys are strictly less than toKey. Returns a view of the portion of this map whose keys are less than or equal to, if inclusive is true toKey. Computer Graphics. Software Engineering.
Web Technology. Cyber Security. C Programming. Control System. Data Mining. Data Warehouse. Javatpoint Services JavaTpoint offers too many high quality services. K : It is the type of keys maintained by this map. V : It is the type of mapped values. It is used to construct an empty tree map that will be sorted using the natural order of its key. It is used to initialize a treemap with the entries from m , which will be sorted using the natural order of the keys. It is used to initialize a treemap with the entries from the SortedMap sm , which will be sorted in the same order as sm.
It returns the key-value pair having the least key, greater than or equal to the specified key, or null if there is no such key. It returns the comparator that arranges the key in order, or null if the map uses the natural ordering.
It returns the greatest key, less than or equal to the specified key, or null if there is no such key. It performs the given action for each entry in the map until all entries have been processed or the action throws an exception.
It returns the key-value pairs whose keys are less than or equal to if inclusive is true toKey. It returns a key-value mapping associated with the greatest key strictly less than the given key, or null if there is no such key. Viewed 11k times. I would like to thanks for explanation in advance. Improve this question.
Amol Patil Amol Patil 2 2 gold badges 10 10 silver badges 40 40 bronze badges. How would you sort a null value? Related - Make treemap tolerate null — Ashish Mathew. Add a comment. Active Oldest Votes. Improve this answer. So, we just have to make Comparator accept the null and sort null key. Vicky Vicky 13 13 silver badges 32 32 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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