In Java, all types of enumerations and iterators (such as Iterator, ListIterator, SplitIterator) are simply navigational cursors and the main purpose of these cursors is to iterate over the elements of the collection. Each cursor has its own features, advantages and disadvantages. In this article, we will walk through these iterators, important methods, advantages, and …
Learn to convert Iterable or Iterator to Stream. It may be desired at times when we want to utilize excellent support of lambda expressions and collectors in Java 8 Stream API.
Unlike traditional iterators, Spliterator is designed with parallelism in mind and mainly helps in parallel processing when the collection or stream has a large number of elements.
The Java ListIterator interface is a bidirectional iterator that iterates over the elements in both forward and backward directions.
Java Iterator interface is used to iterate over the elements of a Collection (List, Set or Map). The Iterator helps in retrieving the elements from the specified collection one by one and optionally performs operations over each element. Java Iterator was first introduced in Java 1.2 as a replacement of Enumerations. …
Java enumerations are only applicable for legacy classes e.g HashTable, and Vector. Iterator is the recommended way to iterate over collections since Java 1.2 and takes place of Enumeration.
When Java Iterator detects the modifications, it cannot guarantee iteration consistency and throws the ConcurrentModificationException.
Learn the difference between internal iteration and external iteration in Java with examples. 1. External Iteration Till Java 7, the collections framework relied on the concept of external iteration where the Collection provides a means to enumerate its elements by implementing the Iterator interface. The clients use the iterator to …
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