Java and J2EE Tutorials 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 File Copy Example – Simple way to Copy File in Java

May 11th, 2019 by App Shah 6

This example illustrates how to copy contents from one file to another file. This topic is related to the I/O (input/output) of java.io.File package. Java.io class represents a file name ...
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Beginner’s Guide to Java eNum – Why and for What should I use Enum? Java Enum Examples

June 30th, 2019 by App Shah 35

Enums are lists of constants like unchangeable variables. Have you heard of Final keyword? It's like that. When you need a predefined list of values which do represent some kind of ...
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Java Iterator: OutOfMemory (OOM) Scenario

May 11th, 2019 by App Shah 2

This simple example explains how to iterate through Java Iterator and avoid possible OutOfMemory (OOM) in Java. This post is filed under Java Web Tutorial. Possible reason: forget to use ...
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Everything about Java12 – New Features, Security and Switch Expression Statement (Examples)

April 11th, 2019 by App Shah

On 19th March 2019 Java12 was released. As we know Java12 was part of rapid release, it was released just in 6 months after Java11 release. In this tutorial, we will go over all changes ...
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How to create executable .jar file using Linux commands and without Eclipse Shortcut?

March 30th, 2019 by App Shah

So far for me it it was so easy to right click in Eclipse IDE and create executable .jar file with few simple clicks. Last week I had to create executable .jar file manually on my Digital ...
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What is Lock(), UnLock(), ReentrantLock(), TryLock() and How it’s different from Synchronized Block in Java?

March 23rd, 2019 by App Shah

In this tutorial we will go over Lock(), UnLock(), ReentrantLock(), TryLock() and how it's different from Synchronized Block in Java. If you have also below questions then you are at ...
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PayPal Java SDK Complete Example – How to Invoke PayPal Authorization REST API using Java Client?

March 17th, 2019 by App Shah 9

PayPal is one of the best online Payment transfer service out there. There is no doubt it's growing day by day with crazy numbers. I personally have hands on experience with PayPal Java ...
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In Java How to Sort a Map on the Values? The Map Interface – Java Collections

March 13th, 2019 by App Shah

In Java How to sort a Map on Value? There are number of ways. Here we will follow below steps. [crayon-5debb2adb5588902743607/] An object that maps keys to values. A map cannot contain ...
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Java Iterator, ListIterator fundamentals and ConcurrentModification Exception

May 11th, 2019 by App Shah 4

Do you have these questions? Java - how to avoid ConcurrentModificationException concurrentmodificationexception iterator next concurrent modification exception in java ...
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