C Itr Current Index
:It is a interface used to get elements of legacy collections(Vector, Hashtable). Enumeration is the first iterator present from JDK 1.0, rests are included in JDK 1.2 with more functionality.
We would like to show you a description here but the site won’t allow us.
Enumerations are also used to specify the input streams to a SequenceInputStream. We can create Enumeration object by calling elements method of vector class on any vector object// Here 'v' is an Vector class object. E is of// type Enumeration interface and refers to 'v'Enumeration e = v. Elements;There are two methods in Enumeration interface namely:// Tests if this enumeration contains more elementspublic boolean hasMoreElements;// Returns the next element of this enumeration// It throws NoSuchElementException// if no more element presentpublic Object nextElement.
:It is a universal iterator as we can apply it to any Collection object. By using Iterator, we can perform both read and remove operations.
It is improved version of Enumeration with additional functionality of remove-ability of a element.Iterator must be used whenever we want to enumerate elements in all Collection framework implemented interfaces like Set, List, Queue, Deque and also in all implemented classes of Map interface. Iterator is the only cursor available for entire collection framework.Iterator object can be created by calling iterator method present in Collection interface.// Here 'c' is any Collection object. Itr is of// type Iterator interface and refers to 'c'Iterator itr = c. FilternoneOutput:0, 1, 2, 3, 4, 5, 6, 7, 8, 90 1 2 3 4 5 6 7 8 90, 2, 4, 6, 8Limitations of Iterator:. Only forward direction iterating is possible. Replacement and addition of new element is not supported by Iterator.:It is only applicable for List collection implemented classes like arraylist, linkedlist etc.
It provides bi-directional iteration.ListIterator must be used when we want to enumerate elements of List. This cursor has more functionality(methods) than iterator.ListIterator object can be created by calling listIterator method present in List interface.// Here 'l' is any List object, ltr is of type// ListIterator interface and refers to 'l'ListIterator ltr = l. ListIterator;ListIterator interface extends Iterator interface. So all three methods of Iterator interface are available for ListIterator. FilternoneOutput:0, 1, 2, 3, 4, 5, 6, 7, 8, 90 1 2 3 4 5 6 7 8 91, 1, 1, 3, 3, 3, 5, 5, 5, 7, 7, 7, 9, 9, 9Limitations of ListIterator: It is the most powerful iterator but it is only applicable for List implemented classes, so it is not a universal iterator.Important Common Points1: Please note that initially any iterator reference will point to the index just before the index of first element in a collection.2: We don’t create objects of Enumeration, Iterator, ListIterator because they are interfaces. We use methods like elements, iterator, listIterator to create objects. These methods have anonymous that extends respective interfaces and return this class object.
This can be verified by below code. For more on inner class refer. FilternoneOutput:java.util.Vector$1java.util.Vector$Itrjava.util.Vector$ListItrThe $ symbol in reference class name is a proof that concept of inner classes is used and these class objects are created.Related Articles:This article is contributed by Gaurav Miglani. If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to contribute@geeksforgeeks.org.
Skyrim se clothing mods. On some of my Armors, Clothes etc. Hello Community!I have a great Problem with Skyrim.
C Itr Current Index Calculator
See your article appearing on the GeeksforGeeks main page and help other Geeks.Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.