Object Serialization – Saving Objects in Java

Serialization is the process of converting the state of an object into byte stream.After the object is serialized has been written into a file, it can be read from the file and deserialized that is bytes that represent the object and its data can be used to recreate the objects in memory. Writing Serialized Object […]

ConcurrentHashMap in Java

ConcurrentHashMap is an alternative to HashTable and synchronizedMap. It is used in multi threaded applications and provided better performance when compared to HashTable and synchronisedMap. ConcurrentHashMap Implementation In Java In concurrentHashMap we have new feature called concurrency level . The ConcurrentHashMap is divided into segments based on the concurrency level.We need to be careful while […]

Fail fast & Fail safe Iterators in Java

Iterators are basically used to traverse over a set of objects one by one. Java supports two types of Iterators  Fail Fast Iterator Fail Safe Iterator Fail Fast Iterator Fail fast iterator do not allow any modifications to a collection while iterating/traversing the collection.By modification I mean any updating, addition of elements in the collection.If […]

How HashMap works in Java1.8?

HashMap is a hash table implementation of Map interface in Java. A map contains a collection of key-value pairs where key maps to the value.HashMap permits null values and null keys and it doesn’t permit duplicate keys.It is unordered so it doesn’t guarantee that the order will remain constant with time. Hashmap provides constant time […]