LinkedHashMap in Java is a concrete class that is HashTable and LinkedList implementation of Map interface. It stores entries using a doubly-linked list. Java LinkedHashMap class extends the HashMap class with a linked-list implementation that supports an ordering of the entries in the map. LinkedHashMap in Java was added in … Read more
Internal Working of HashMap in Java | In this tutorial, we will learn how HashMap works in Java internally step by step with example. If you do not familiar with the basic features of Java HashMap, first go to this tutorial and then come to learn the internal working of … Read more
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 while iterating over it. Let’s understand the following ways to … Read more
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 value are objects. HashMap uses an object to retrieve another … Read more
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 version. Java LinkedHashSet class is the same as HashSet class, … Read more
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 the ascending order while HashSet does not maintain any order. Java TreeSet implements SortedSet interface. It is a collection for storing a set … Read more
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 be unique. Now we will learn in this tutorial how … Read more