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.

Java Collections – hashCode() and equals() – How to Override equals() and hashcode() Method in Java?

August 8th, 2018 by App Shah

equals() and hashCode() in Java are two fundamental method which is declared in Object class and part or core Java library. If you have any one of below concerns in Java then you are at ...
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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 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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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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How to Fix Maven Artifacts Could not be Resolved Error? Exclude jms, jmxri & jmxtools JAR Dependencies

April 17th, 2018 by App Shah 2

I remember long time ago, I faced the same error and I tried fixing it by manually adding .jar files to my maven repository locally. I executed below command to install it in my localhost ...
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How to Read Complete File at a once in Java without using any Loop?

July 14th, 2018 by App Shah

Java is very flexible language in terms of functionalities and utilities available for use to use out of the box. There is no way you have create your own utility for operations. Just ...
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Java 10 Released with Parallel Full GC, Application Class-Data Sharing – Java SE 10 (JDK 10)