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The ArrayList Class
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ArrayList supports dynamic arrays that can grow or shrink as needed In other words, an ArrayList can increase or decrease in size at runtime An ArrayList is created with an initial size When this size is exceeded, the collection is automatically enlarged When objects are removed, the array can be shrunk
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ArrayList extends AbstractList and implements the List interface (It also implements RandomAccess to indicate that it supports fast random access to its elements) It is a generic class that has this declaration: class ArrayList<E> Here, E specifies the type of objects that the list will hold ArrayList defines these constructors: ArrayList( ) ArrayList(Collection< extends E> col) ArrayList(int capacity) The first constructor builds an empty array list The second constructor builds an array list that is initialized with the elements of the collection col The third constructor builds an array list that has the specified initial capacity The capacity is the size of the underlying array that is used to store the elements The capacity grows automatically as elements are added to an array list In cases in which you know that a certain minimum number of elements will be stored, you can set the initial capacity in advance This prevents subsequent reallocations, which are costly in terms of time ArrayList offers a useful alternative to Java s normal arrays In Java, arrays are of a fixed length After an array has been created, it cannot grow or shrink, which means that you must know in advance how many elements an array will hold However, sometimes this is not possible For example, you might want use an array to hold a list of values (such as product ID numbers) received via an Internet connection in which the list is terminated by a special value Thus, the number of values is not known until the terminator is received In such a case, how large do you make the array that will receive the values ArrayList offers a solution to this type of problem In addition to the methods defined by the interfaces that it implements, ArrayList defines two methods of its own: ensureCapacity( ) and trimToSize( ) They are shown here: void ensureCapacity(int cap) void trimToSize( ) The ensureCapacity( ) method lets you manually increase the capacity of an ArrayList, which is the number of elements that it can hold before the list will need to be enlarged The new capacity is specified by cap Alternatively, trimToSize( ) lets you reduce the size of an ArrayList so that it precisely fits the number of elements that it holds
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LinkedList provides a linked-list data structure It extends AbstractSequentialList and implements the List and Deque interfaces Because it uses a doubly-linked list, a LinkedList will automatically grow when an element is added to the list and shrink when an element is removed Linked lists are especially useful in situations in which items are inserted or removed from the middle of the list New items are simply linked in When an item is removed, the links to old items are replaced by links to the items that preceded and followed the deleted item Rearranging links is often more efficient than physically compacting or expanding an array, for example LinkedList is a generic class that has this declaration: class LinkedList<E>
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Here, E specifies the type of objects that the list will hold LinkedList has the two constructors shown here: LinkedList( ) LinkedList(Collection< extends E> col) The first constructor builds an empty linked list The second constructor builds a linked list that is initialized with the elements of the collection col
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HashSet creates a collection that uses a hash table for storage A hash table stores information by using a mechanism called hashing In hashing, the informational content of a key is used to determine a unique value, called its hash code The hash code is then used as the index at which the data associated with the key is stored The transformation of the key into its hash code is performed automatically you never see the hash code itself Also, your code can t directly index the hash table The advantage of hashing is that it allows the execution time of add( ), contains( ), remove( ), and size( ) to remain constant even for large sets Duplicate elements are not allowed in a HashSet HashSet extends AbstractSet and implements the Set interface It is a generic class that has this declaration: class HashSet<E> Here, E specifies the type of objects that the set will hold HashSet defines the following constructors: HashSet( ) HashSet(Collection< extends E> col) HashSet(int capacity) HashSet(int capacity, oat llRatio) The first form constructs a default hash set The second form initializes the hash set by using the elements of col The third form initializes the capacity of the hash set to capacity The fourth form initializes both the capacity and the fill ratio (also called load capacity) of the hash set The fill ratio must be between 00 and 10, and it determines how full the hash set can be before it is resized upward Specifically, when the number of elements is greater than the capacity of the hash set multiplied by its fill ratio, the hash set is expanded For constructors that do not take a fill ratio, 075 is used Here is a key point about HashSet: the elements are not in any particular order For example, they are neither sorted, nor are they stored in insertion order This is because the process of hashing does not lend itself to the creation of ordered sets Therefore, the order in which elements are obtained when the collection is enumerated via an iterator or a for-each style for loop is unspecified
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