[1] Repost http://javabypatel.blogspot.com/2016/09/concurrenthashmap-interview-questions.html Question 1. What is the need of ConcurrentHashMap when there is HashMap and Hashtable already present? Performance and Thread safety are 2 parameter on which ConcurrentHashMap is focused. Imagine a sc...
Get ready for high-paying Java jobs with these Java Interview Questions and Answers!Types of HashMapsMentioned below are the various types of HashMaps in Java:LinkedHashMap: LinkedHashMap extends the functionality of HashMap by maintaining the insertion order of elements. It implies that when ...
Let's the code to actually generate a concurrent hash set in Java 8: importjava.util.Set;importjava.util.concurrent.ConcurrentHashMap;/* * Java Program to create ConcurrentHashSet from ConcurrentHashMap * This code requires JDK 8 because we use newKeySet() method * which is only available...
Step 1: Import the java.util package Step 2: Declare and instantiate the key-value pairs of HashMap Common HashMap Tasks and Methods Adding elements to a HashMap Accessing elements from a HashMap Remove elements from a HashMap Check if a HashMap contains a key Check if a HashMap is emp...
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Happy coding Justin Related Articles : Java Best Practices – DateFormat in a Multithreading Environment Java Best Practices – High performance Serialization Java Best Practices – Vector vs ArrayList vs HashSet Java Best Practices – String performance and Exact String Matching ...