Get size of LinkedHashMap in Java

In this tutorial, we will learn how to Get size of LinkedHashMap in Java. LinkedHashMap in Java is Hash table and Linked list implementation of the Map interface, with predictable iteration order. This implementation differs from HashMap in that it maintains a doubly-linked list running through all of its entries. It maintains a linked list of the entries in the map, in the order in which they were inserted. This allows insertion-order iteration over the map. That is, when iterating through a collection-view of a LinkedHashMap, the elements will be returned in the order in which they…

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Get size of Hashtable in Java

In this tutorial, we will learn how to Get size of Hashtable in Java. Hashtable in Java stores key, value pairs. The keys and values cannot be null. The key in Hashtable is hashed, and the resulting hash code is used as the index at which the value is stored within the table. HashTable is similar to HashMap, but it is synchronized. Hashtable can only store objects that override the hashCode( ) and equals( ) methods that are defined in Object class. The hashCode( ) method computes and returns the hash code…

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Get size of TreeMap in Java

In this tutorial, we will learn how to Get size of  TreeMap in Java. TreeMap in Java provides an efficient way of storing key/value pairs in sorted order and allows rapid retrieval of the elements in map. The TreeMap class extends AbstractMap and implements the NavigableMap interface. It creates maps stored in a tree structure. TreeMap is sorted according to the natural ordering of its keys, or by a Comparator provided at map creation time. TreeMap in Java is not synchronized In we want to calculate the size or no. of elements in…

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Get size of HashMap in Java

In this tutorial, we will learn how to Get size of HashMap in Java. HashMap in Java is a hash table based implementation of Map Interface. It is used to store key-value pairs. HashMap is a widely used collection classes in java.  HashMap class is similar to Hashtable, except that it is not synchronized and it allows null key and values. HashMap in Java is an unordered collection which means that this class does not guarantee that the order will remain constant over the time. If multiple threads access a hash map concurrently,…

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Get size of ArrayList in Java

In this tutorial, we will learn how to Get size of ArrayList in Java. ArrayList in Java is a resizable-array implementation of the List interface. ArrayList in Java implements all optional list operations, and permits all elements, including null. In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to store the list. The ArrayList class extends AbstractList and implements the List interface. ArrayList supports dynamic arrays that can grow as needed. Standard Java arrays are of a fixed…

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Get size of LinkedHashSet in Java

In this tutorial, we will learn how to Get size of LinkedHashSet in Java. LinkedHashSet in Java is Hash table and linked list implementation of the Set interface. It extends HashSet and implements Set interface. LinkedHashSet maintains a linked list of the entries in the set, in the order in which they were inserted. This allows insertion-order iteration over the set. That is, when iterating through a LinkedHashSet using an iterator, the elements will be returned in the order in which they were inserted. This is also the order in which they are…

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Get size of TreeSet in Java

In this tutorial, we will learn how to Get size of TreeSet in Java. TreeSet in Java extends AbstractSet and implements the NavigableSet interface. It creates a collection that uses a tree for storage. The objects are stored in sorted, ascending order. Access and retrieval times are quite fast, which makes TreeSet an excellent choice when storing large amounts of sorted information that must be found quickly. TreeSet is similar to HashSet, the difference is that TreeSet sorts the elements in ascending order and doesn’t allow null elements. In we want…

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Get size of HashSet in Java

In this tutorial, we will learn how to Get size of HashSet in Java. HashSet in Java extends AbstractSet and implements Set interface which is backed by hash table.  It creates a collection that uses a hash table for storage. This class makes no guarantees as to the iteration order of the set; in particular, it does not guarantee that the order will remain constant over time. This class permits null element. HashSet does not guarantee the order of its elements, because the process of hashing doesn’t usually lend itself to the creation of…

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Remove first and last element from LinkedList in Java

In this tutorial, we will learn how to Remove first and last element from LinkedList in Java. LinkedList in Java is doubly-linked list implementation of the List and Deque interfaces. LinkedList class extends AbstractSequentialList and implements the List, Deque, and Queue interfaces and permits null elements. It provides a linked-list data structure. If we want to remove first and last element from LinkedList in Java, then this class provides two methods removeFirst() and removeLast() to remove first and last element from LinkedList. We will use these method to remove first and last element from LinkedList. The syntax…

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Get tailset from TreeSet in Java

In this tutorial, we will learn how to Get tailset from TreeSet in Java. TreeSet in Java extends AbstractSet and implements the NavigableSet interface. It creates a collection that uses a tree for storage. The objects are stored in sorted, ascending order. Access and retrieval times are quite fast, which makes TreeSet an excellent choice when storing large amounts of sorted information that must be found quickly. TreeSet is similar to HashSet, the difference is that TreeSet sorts the elements in ascending order and doesn’t allow null elements. TreeSet class in…

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