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HashSet


java.util

Class HashSet<E>

    • Constructor Detail

      • HashSet

        public HashSet()
        Constructs a new empty instance of HashSet.
      • HashSet

        public HashSet(int capacity)
        Constructs a new instance of HashSet with the specified capacity.
        Parameters:
        capacity - the initial capacity of this HashSet.
      • HashSet

        public HashSet(int capacity,
               float loadFactor)
        Constructs a new instance of HashSet with the specified capacity and load factor.
        Parameters:
        capacity - the initial capacity.
        loadFactor - the initial load factor.
      • HashSet

        public HashSet(Collection<? extends E> collection)
        Constructs a new instance of HashSet containing the unique elements in the specified collection.
        Parameters:
        collection - the collection of elements to add.
    • Method Detail

      • add

        public boolean add(E object)
        Adds the specified object to this HashSet if not already present.
        Specified by:
        add in interface Collection<E>
        Specified by:
        add in interface Set<E>
        Overrides:
        add in class AbstractCollection<E>
        Parameters:
        object - the object to add.
        Returns:
        true when this HashSet did not already contain the object, false otherwise
      • clone

        public Object clone()
        Returns a new HashSet with the same elements and size as this HashSet.
        Overrides:
        clone in class Object
        Returns:
        a shallow copy of this HashSet.
        See Also:
        Cloneable
      • contains

        public boolean contains(Object object)
        Searches this HashSet for the specified object.
        Specified by:
        contains in interface Collection<E>
        Specified by:
        contains in interface Set<E>
        Overrides:
        contains in class AbstractCollection<E>
        Parameters:
        object - the object to search for.
        Returns:
        true if object is an element of this HashSet, false otherwise.
      • isEmpty

        public boolean isEmpty()
        Returns true if this HashSet has no elements, false otherwise.
        Specified by:
        isEmpty in interface Collection<E>
        Specified by:
        isEmpty in interface Set<E>
        Overrides:
        isEmpty in class AbstractCollection<E>
        Returns:
        true if this HashSet has no elements, false otherwise.
        See Also:
        size()
      • remove

        public boolean remove(Object object)
        Removes the specified object from this HashSet.
        Specified by:
        remove in interface Collection<E>
        Specified by:
        remove in interface Set<E>
        Overrides:
        remove in class AbstractCollection<E>
        Parameters:
        object - the object to remove.
        Returns:
        true if the object was removed, false otherwise.
      • size

        public int size()
        Returns the number of elements in this HashSet.
        Specified by:
        size in interface Collection<E>
        Specified by:
        size in interface Set<E>
        Specified by:
        size in class AbstractCollection<E>
        Returns:
        the number of elements in this HashSet.


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