WeakHashMap in Java is a class that provides another Map implementation based on weak keys. It was added in JDK 1.2 version and present in java.util.WeakHashMap. Java WeakHashMap extends AbstractMap class to use HashTable with weak keys. The key of…
TreeMap in Java is a concrete class that is a red-black tree based implementation of the Map interface. It provides an efficient way of storing key/value pairs in sorted order automatically and allows rapid retrieval. It was added in JDK…
LinkedHashMap in Java is a concrete class that is HashTable and LinkedList implementation of Map interface. It stores entries using a doubly-linked list. This class extends the HashMap class with a linked-list implementation that supports an ordering of the entries…
In this tutorial, we will learn the internal working of HashMap in Java 8 step by step with the help of an example. If you do not familiar with the basic features of Java HashMap, first go to this tutorial…
In this tutorial, we will learn how to iterate HashMap in Java. Java provides multiple convenient ways to iterate over a hash map. We can iterate over keys, values, or both. We can also remove an element from a map…
HashMap in Java is an unordered collection that stores elements (objects) in the form of key-value pairs (called entries). It is expressed as HashMap<Key, Value>, or HashMap<K, V>, where K stands for key and V for value. Both Key and…
LinkedHashSet in Java is a concrete class that implements set interface and extends HashSet class with a doubly linked list implementation. It internally uses a linked list to store the elements in the set. It was added in Java 1.4…
A TreeSet in Java is another important implementation of the Set interface that is similar to the HashSet class, with one added improvement. It sorts elements in ascending order while HashSet does not maintain any order. Java TreeSet implements SortedSet…
We have known in the previous tutorial, a map in Java is a container object that stores elements in the form of key and value pairs. If the key is provided, its associated value can be retrieved easily. Keys must…
