Java & J2EE Archives...

One of my favorite language Java is a programming language and computing platform developed by Sun which is acquired by Oracle now. J2EE is Java Enterprise Edition, which consists of core Java with a powerful set of libraries.

On Crunchify, we do have more than 400+ Java and J2EE tips with additional production ready utilities. Explore all tutorials below.

When Should I use CopyOnWriteArrayList Vs. ArrayList in Java? Avoid java.util.ConcurrentModification Exception

July 23rd, 2018 by App Shah 4

java.util.List is an ordered collection also known as a sequence. Arraylist is a very basic implementation of List. There are number of articles I've posted on Crunchify before on ArrayList ...
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Java Method Hiding and Overriding: Override Static Method in Java

July 19th, 2018 by App Shah 4

Want to learn Fundamental of Instance Method? In Java, an instance method in a subclass with the same signature and return type as an instance method in the superclass overrides the ...
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What are all the Different Ways to Create an Object in Java? Total 6 ways – Complete Tutorial

September 2nd, 2018 by App Shah 16

As you know, in Java, a class provides the blueprint for objects; you create an object from a class. There are four different ways to create objects in java: Method-1 Using new keyword. ...
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What is Java Synchronized Collections? Complete Tutorials using java.util.Collections

July 1st, 2018 by App Shah 2

Java Collection Framework is one of the most used section. There are more than 100 APIs are available for us to use at fingertips. synchronizedMap() returns a synchronized (thread-safe) ...
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Java: How to Copy Properties from One Bean to Another

September 2nd, 2018 by App Shah

Most Java developers are used to creating Java classes that conform to the JavaBeans naming patterns for property getters and setters. It is natural to then access these methods directly, ...
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Java Timer and TimerTask – Reminder Class Tutorials Example

September 2nd, 2018 by App Shah

java.util.Timer is a utility class that can be used to schedule a thread to be executed at certain time in future. Java Timer class can be used to schedule a task to be run one-time or to be ...
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In Java What is a Difference Between IdentityHashMap and HashMap + Performance Comparison

April 26th, 2018 by App Shah 2

Sometime back I have a special case in which I have to compare Map's Key based on equality operator (==). The equality operator (==) compares the references (addresses in memory) of the two ...
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In Java How to Get Random Element from ArrayList and ThreadLocalRandom Usage

April 23rd, 2018 by App Shah

Java is pretty amazing. Sometimes during mock testing you may need to generate Random number like Integer or Double or Long or String from ArrayList. In this tutorial we will create ...
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Java Method Overriding Examples and Concepts: Overriding Rules

September 2nd, 2018 by App Shah 18

Last week I wrote Java Method Hiding and Overriding: Override Static Method in Java here. But I realized, it's worth sharing some more information on Java Method Overriding. Rules for ...
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