I think your implementation is overall very good, two small comments: Improving readability for return statement in hasNext to return examples.size() != index;; Making the examples field final: private final List examples;; However, if the Vector class here is java.util.Vector you should know that it is considered deprecated in favor of the ArrayList class. The collection API implements the iterator() method and hence data can be retrieved from interfaces like Map, List, Queue, Deque and Set which are all implemented from the collection framework. An Iterator is an object that can be used to loop through collections, like ArrayList and HashSet.It is called an "iterator" because "iterating" is the technical term for looping. 2. Parallel iteration of elements is not supported by list Iterator. An iterator is an interface that is used in place of Enumerations in the Java Collection Framework. listiterator does not support the good performance of numerous elements iteration. Moreover, an iterator differs from the enumerations in two ways: Iterator permits the caller to remove the given elements from the specified collection during the iteration of the elements. It is not applicable for all collection API. This iterator is only for list implementation classes. An iterator over a collection. For Wrapper types or arrays with non-primitive types, we can use Arrays.asList() to get a list backed by the array. One of the oldest techniques in Java for iterating entity categories is the Iterator interface (yet not aged – enumerator predated Iterator). Not a universal cursor. Java Iterator implementation - next() and hasNext() enforcing order. 1. Iterators differ from enumerations in two ways: Iterators allow the caller to remove elements from the underlying collection during the iteration with well-defined semantics. Introduction to Iterator in Java. util package. Java Iterator. A quick tutorial on how to use the Java language to create your own data structure in application using the Iterator class that comes built into Java. For our example scenario we have 2 types – Department and Employee.A Department instance holds multiple Employee … It is available in Java package called Java. Convert Array to a List. // * The use of type parameters (i.e. Java generics) // * Implementing an iterator over some collection, in this case an array // * Implementing the Iterable interface, which enables your collection // to work with the Java simple for loops, i.e. In order to be able to use it in a for loop construction, the iterable interface must be implemented.. See also: Java - (Enumerable|Iterator) Data Type (Iterable interface) Introduced in the Java JDK 1.2 release, the java.util.Iterator interface allows the iteration of container classes. Then we can simply use iterator() method provided by the List interface to get an iterator over the object array. What the technical term “java iterator” exactly mean? To use an Iterator, you must import it from the java.util package. Ask Question Asked 10 years, 11 months ago. Active 1 year ago. Iterator takes the place of Enumeration in the Java Collections Framework. A quick and practical guide to the Iterator class in Java. The iterator implementation in Java is just an inner class that implements the iterator interface.. Iterator v/s ListIterator. Let us see a Java code example to see how Iterable implementation can be done.. Java code example showing Iterable implementation Lets take a simple case of aggregation to show an Iterable implementation in action. The iterator java mechanism portrays an object capable of initializing, one object at a time, through a list of Java objects. (for String s : list) // // To illustrate these concepts we implement a Java class that "wraps" a raw An Iterator is an interface that is used to fetch elements one by one in a collection. ... 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