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Android Reference

AbstractMap


java.util

Class AbstractMap<K,V>

    • Constructor Summary

      Constructors
      Modifier Constructor and Description
      protected AbstractMap()
    • Method Summary

      Methods
      Modifier and Type Method and Description
      void clear()
      Removes all elements from this Map, leaving it empty.
      protected Object clone()
      Creates and returns a copy of this Object.
      boolean containsKey(Object key)
      Returns whether this Map contains the specified key.
      boolean containsValue(Object value)
      Returns whether this Map contains the specified value.
      abstract Set<Map.Entry<K,V>> entrySet()
      Returns a Set containing all of the mappings in this Map.
      boolean equals(Object object)
      Compares this instance with the specified object and indicates if they are equal.
      V get(Object key)
      Returns the value of the mapping with the specified key.
      int hashCode()
      Returns an integer hash code for this object.
      boolean isEmpty()
      Returns whether this map is empty.
      Set<K> keySet()
      Returns a set of the keys contained in this Map.
      V put(K key, V value)
      Maps the specified key to the specified value.
      void putAll(Map<? extends K,? extends V> map)
      Copies every mapping in the specified Map to this Map.
      V remove(Object key)
      Removes a mapping with the specified key from this Map.
      int size()
      Returns the number of mappings in this Map.
      String toString()
      Returns a string containing a concise, human-readable description of this object.
      Collection<V> values()
      Returns a Collection of the values contained in this Map.
    • Constructor Detail

      • AbstractMap

        protected AbstractMap()
    • Method Detail

      • clear

        public void clear()
        Removes all elements from this Map, leaving it empty.

        This implementation calls entrySet().clear().

        Specified by:
        clear in interface Map<K,V>
        See Also:
        Map.isEmpty(), Map.size()
      • containsKey

        public boolean containsKey(Object key)
        Returns whether this Map contains the specified key.

        This implementation iterates its key set, looking for a key that key equals.

        Specified by:
        containsKey in interface Map<K,V>
        Parameters:
        key - the key to search for.
        Returns:
        true if this map contains the specified key, false otherwise.
      • containsValue

        public boolean containsValue(Object value)
        Returns whether this Map contains the specified value.

        This implementation iterates its entry set, looking for an entry with a value that value equals.

        Specified by:
        containsValue in interface Map<K,V>
        Parameters:
        value - the value to search for.
        Returns:
        true if this map contains the specified value, false otherwise.
      • entrySet

        public abstract Set<Map.Entry<K,V>> entrySet()
        Description copied from interface: Map
        Returns a Set containing all of the mappings in this Map. Each mapping is an instance of Map.Entry. As the Set is backed by this Map, changes in one will be reflected in the other.
        Specified by:
        entrySet in interface Map<K,V>
        Returns:
        a set of the mappings
      • equals

        public boolean equals(Object object)
        Compares this instance with the specified object and indicates if they are equal. In order to be equal, o must represent the same object as this instance using a class-specific comparison. The general contract is that this comparison should be reflexive, symmetric, and transitive. Also, no object reference other than null is equal to null.

        The default implementation returns true only if this == o. See Writing a correct equals method if you intend implementing your own equals method.

        The general contract for the equals and Object.hashCode() methods is that if equals returns true for any two objects, then hashCode() must return the same value for these objects. This means that subclasses of Object usually override either both methods or neither of them.

        This implementation first checks the structure of object. If it is not a map or of a different size, this returns false. Otherwise it iterates its own entry set, looking up each entry's key in object. If any value does not equal the other map's value for the same key, this returns false. Otherwise it returns true.

        Specified by:
        equals in interface Map<K,V>
        Overrides:
        equals in class Object
        Parameters:
        object - the object to compare this instance with.
        Returns:
        true if the specified object is equal to this Object; false otherwise.
        See Also:
        Object.hashCode()
      • get

        public V get(Object key)
        Returns the value of the mapping with the specified key.

        This implementation iterates its entry set, looking for an entry with a key that key equals.

        Specified by:
        get in interface Map<K,V>
        Parameters:
        key - the key.
        Returns:
        the value of the mapping with the specified key, or null if no mapping for the specified key is found.
      • hashCode

        public int hashCode()
        Returns an integer hash code for this object. By contract, any two objects for which Object.equals(java.lang.Object) returns true must return the same hash code value. This means that subclasses of Object usually override both methods or neither method.

        Note that hash values must not change over time unless information used in equals comparisons also changes.

        See Writing a correct hashCode method if you intend implementing your own hashCode method.

        This implementation iterates its entry set, summing the hashcodes of its entries.

        Specified by:
        hashCode in interface Map<K,V>
        Overrides:
        hashCode in class Object
        Returns:
        this object's hash code.
        See Also:
        Object.equals(java.lang.Object)
      • isEmpty

        public boolean isEmpty()
        Returns whether this map is empty.

        This implementation compares size() to 0.

        Specified by:
        isEmpty in interface Map<K,V>
        Returns:
        true if this map has no elements, false otherwise.
        See Also:
        Map.size()
      • keySet

        public Set<K> keySet()
        Returns a set of the keys contained in this Map. The Set is backed by this Map so changes to one are reflected by the other. The Set does not support adding.

        This implementation returns a view that calls through this to map. Its iterator transforms this map's entry set iterator to return keys.

        Specified by:
        keySet in interface Map<K,V>
        Returns:
        a set of the keys.
      • put

        public V put(K key,
            V value)
        Maps the specified key to the specified value.

        This base implementation throws UnsupportedOperationException.

        Specified by:
        put in interface Map<K,V>
        Parameters:
        key - the key.
        value - the value.
        Returns:
        the value of any previous mapping with the specified key or null if there was no mapping.
      • putAll

        public void putAll(Map<? extends K,? extends V> map)
        Copies every mapping in the specified Map to this Map.

        This implementation iterates through map's entry set, calling put() for each.

        Specified by:
        putAll in interface Map<K,V>
        Parameters:
        map - the Map to copy mappings from.
      • remove

        public V remove(Object key)
        Removes a mapping with the specified key from this Map.

        This implementation iterates its entry set, removing the entry with a key that key equals.

        Specified by:
        remove in interface Map<K,V>
        Parameters:
        key - the key of the mapping to remove.
        Returns:
        the value of the removed mapping or null if no mapping for the specified key was found.
      • size

        public int size()
        Returns the number of mappings in this Map.

        This implementation returns its entry set's size.

        Specified by:
        size in interface Map<K,V>
        Returns:
        the number of mappings in this Map.
      • toString

        public String toString()
        Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation is equivalent to the following expression:
           getClass().getName() + '@' + Integer.toHexString(hashCode())

        See Writing a useful toString method if you intend implementing your own toString method.

        This implementation composes a string by iterating its entry set. If this map contains itself as a key or a value, the string "(this Map)" will appear in its place.

        Overrides:
        toString in class Object
        Returns:
        a printable representation of this object.
      • clone

        protected Object clone()
                        throws CloneNotSupportedException
        Description copied from class: Object
        Creates and returns a copy of this Object. The default implementation returns a so-called "shallow" copy: It creates a new instance of the same class and then copies the field values (including object references) from this instance to the new instance. A "deep" copy, in contrast, would also recursively clone nested objects. A subclass that needs to implement this kind of cloning should call super.clone() to create the new instance and then create deep copies of the nested, mutable objects.
        Overrides:
        clone in class Object
        Returns:
        a copy of this object.
        Throws:
        CloneNotSupportedException - if this object's class does not implement the Cloneable interface.


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