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SortedMap


java.util

Interface SortedMap<K,V>

  • All Superinterfaces:
    Map<K,V>
    All Known Subinterfaces:
    ConcurrentNavigableMap<K,V>, NavigableMap<K,V>
    All Known Implementing Classes:
    ConcurrentSkipListMap, TreeMap


    public interface SortedMap<K,V>
    extends Map<K,V>
    A map that has its keys ordered. The sorting is according to either the natural ordering of its keys or the ordering given by a specified comparator.
    • Method Detail

      • comparator

        Comparator<? super K> comparator()
        Returns the comparator used to compare keys in this sorted map.
        Returns:
        the comparator or null if the natural order is used.
      • firstKey

        K firstKey()
        Returns the first key in this sorted map.
        Returns:
        the first key in this sorted map.
        Throws:
        NoSuchElementException - if this sorted map is empty.
      • headMap

        SortedMap<K,V> headMap(K endKey)
        Returns a sorted map over a range of this sorted map with all keys that are less than the specified endKey. Changes to the returned sorted map are reflected in this sorted map and vice versa.

        Note: The returned map will not allow an insertion of a key outside the specified range.

        Parameters:
        endKey - the high boundary of the range specified.
        Returns:
        a sorted map where the keys are less than endKey.
        Throws:
        ClassCastException - if the class of the end key is inappropriate for this sorted map.
        NullPointerException - if the end key is null and this sorted map does not support null keys.
        IllegalArgumentException - if this map is itself a sorted map over a range of another map and the specified key is outside of its range.
      • lastKey

        K lastKey()
        Returns the last key in this sorted map.
        Returns:
        the last key in this sorted map.
        Throws:
        NoSuchElementException - if this sorted map is empty.
      • subMap

        SortedMap<K,V> subMap(K startKey,
                            K endKey)
        Returns a sorted map over a range of this sorted map with all keys greater than or equal to the specified startKey and less than the specified endKey. Changes to the returned sorted map are reflected in this sorted map and vice versa.

        Note: The returned map will not allow an insertion of a key outside the specified range.

        Parameters:
        startKey - the low boundary of the range (inclusive).
        endKey - the high boundary of the range (exclusive),
        Returns:
        a sorted map with the key from the specified range.
        Throws:
        ClassCastException - if the class of the start or end key is inappropriate for this sorted map.
        NullPointerException - if the start or end key is null and this sorted map does not support null keys.
        IllegalArgumentException - if the start key is greater than the end key, or if this map is itself a sorted map over a range of another sorted map and the specified range is outside of its range.
      • tailMap

        SortedMap<K,V> tailMap(K startKey)
        Returns a sorted map over a range of this sorted map with all keys that are greater than or equal to the specified startKey. Changes to the returned sorted map are reflected in this sorted map and vice versa.

        Note: The returned map will not allow an insertion of a key outside the specified range.

        Parameters:
        startKey - the low boundary of the range specified.
        Returns:
        a sorted map where the keys are greater or equal to startKey.
        Throws:
        ClassCastException - if the class of the start key is inappropriate for this sorted map.
        NullPointerException - if the start key is null and this sorted map does not support null keys.
        IllegalArgumentException - if this map itself a sorted map over a range of another map and the specified key is outside of its range.


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