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Showing content from https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/util/TreeMap.html below:

TreeMap (Java SE 24 & JDK 24)

Type Parameters:

K - the type of keys maintained by this map

V - the type of mapped values

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>, NavigableMap<K,V>, SequencedMap<K,V>, SortedMap<K,V>

• Nested Class Summary
• Constructor Summary

  Constructors

  Constructs a new, empty tree map, using the natural ordering of its keys.

  Constructs a new, empty tree map, ordered according to the given comparator.

  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.

• Method Summary

  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.

  void

  Removes all of the mappings from this map.

  Returns a shallow copy of this TreeMap instance.

  Returns the comparator used to order the keys in this map, or

  null

  if this map uses the

  natural ordering

  of its keys.

  Attempts to compute a mapping for the specified key and its current mapped value, or null if there is no current mapping (optional operation).

  If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null (optional operation).

  If the value for the specified key is present and non-null, attempts to compute a new mapping given the key and its current mapped value (optional operation).

  boolean

  Returns true if this map contains a mapping for the specified key.

  boolean

  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 reverse order view of the mappings 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 the first (lowest) key currently in this map.

  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.

  Returns a key-value mapping associated with the least key strictly greater than the given key, or null if there is no such key.

  Returns the least key strictly greater than the given key, or null if there is no such key.

  Returns a

  Set

  view of the keys contained in this map.

  Returns a key-value mapping associated with the greatest key in this map, or null if the map is empty.

  Returns the last (highest) key currently in this map.

  Returns a key-value mapping associated with the greatest key strictly less than the given key, or null if there is no such key.

  Returns the greatest key strictly less than the given key, or null if there is no such key.

  If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value (optional operation).

  Returns a

  NavigableSet

  view of the keys contained in this map.

  Removes and returns a key-value mapping associated with the least key in this map, or null if the map is empty (optional operation).

  Removes and returns a key-value mapping associated with the greatest key in this map, or null if the map is empty (optional operation).

  Associates the specified value with the specified key in this map.

  void

  Copies all of the mappings from the specified map to this map.

  Throws UnsupportedOperationException.

  Throws UnsupportedOperationException.

  Removes the mapping for this key from this TreeMap if present.

  int

  Returns the number of key-value mappings in this map.

  subMap(K fromKey, boolean fromInclusive, K toKey, boolean toInclusive)

  Returns a view of the portion of this map whose keys range from fromKey to toKey.

  Returns a view of the portion of this map whose keys range from fromKey, inclusive, to toKey, exclusive.

  Returns a view of the portion of this map whose keys are greater than or equal to fromKey.

  Returns a view of the portion of this map whose keys are greater than (or equal to, if inclusive is true) fromKey.

  Returns a

  Collection

  view of the values contained in this map.

• Constructor Details
  • TreeMap
  • TreeMap
  • TreeMap
  • TreeMap
• Method Details
  • size
  • containsKey
  • containsValue
  • get
  • comparator
  • firstKey
  • lastKey
  • putFirst
  • putLast
  • putAll
  • put
  • computeIfAbsent
  • computeIfPresent
  • compute
  • merge
  • remove
  • clear
  • clone
  • firstEntry
  • lastEntry
  • pollFirstEntry
  • pollLastEntry
  • lowerEntry
  • lowerKey
  • floorEntry
  • floorKey
  • ceilingEntry
  • ceilingKey
  • higherEntry
  • higherKey
  • keySet
  • navigableKeySet
  • descendingKeySet
  • values
  • entrySet
  • descendingMap
  • subMap
  • headMap
  • tailMap
  • subMap
  • headMap
  • tailMap

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