Interview

In this tutorial,  we are going to see differences between Serializable and Externalizable interface in Java. Java Serialization Tutorial: Serialization in java Java Serialization interview questions and answers serialversionuid in java serialization externalizable in java Transient keyword in java Difference between Serializable and Externalizable in Java Before understanding difference, let me provide a short note on Serializable […]

In this tutorial, we will see how to rotate an array be K positions. Problem: N=6 and k=2 If Arr[] = {1, 2, 3, 4, 5, 6} and k=2 then [rotated array](https://java2blog.com/search-element-in-sorted-and-rotated-array-java/ “rotated array”) will be  {5, 6, 1, 2,  3,  4} Solution: There are multiple ways to solve this problem. Approach 1: Move each […]

Synchronization is ability to restrict access to shared resource to only one thread. When two or more threads need access to shared resource, there has to be some mechanism such that shared resource will be used by only one thread. The process by which we can achieve it is called Synchronization. Why do you need […]

1. Introduction Java’s Executors.newCachedThreadPool() factory method provides a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available. Our goal is to understand how to use this thread pool to execute asynchronous tasks efficiently. 2. What is newCachedThreadPool? The newCachedThreadPool method from the java.util.concurrent.Executors class is a […]

Java 5 has introduced new concurrent API called Executor frameworks to make programmer life easy. It simplifies design and development of multi-thread applications. It consists of mainly Executor, ExecutorService interface and ThreadPoolExecutor class which implements both interfaces i.e. Executor and ExecutorService. ThreadPoolExecutor class provide the implementation of thread pool. We will understand more about it […]

In this post, I am going to share java interview questions which are generally asked on immutable class. Immutable class is important topic as it deals with creation of thread safe class. Here I am providing some important immutable class interview questions with answers. 1. What is immutable class? Answer : Immutable objects are those […]

In this tutorial, we are going to see how to create immutable class in java. Immutable class is class whose state can not be changed once created. Example: String is best example for immutable class. Once you create a String, you can not change it. Immutable class is very simple to understand, it has only […]

This is another post in the series of mock questions for . One of the exam objective is “Apply encapsulation principles to a class”. This exam objective tests your knowledge on how to write a class that meets the encapsulation principles and validate your understanding. I have prepared a set of good mock questions for […]

If you want to practice data structure and algorithm programs, you can go through 100+ java coding interview questions. In this post, we will see how to find smallest and largest element in an array. 1. Introduction to Problem Let’s say we have an array of numbers. [crayon-66463e99e42fa355869077/] Our goal is to find out smallest and […]