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What is RegEx Pattern (Regular Expression)? How to use it in Java? Example Attached

August 19th, 2018 by App Shah

What is RegEx? Regular Expression is a search pattern for String. java.util.regex Classes for matching character sequences against patterns specified by regular expressions in Java. You could use Regex for: Searching Text Extrating Text Modifying Text Let's discuss some basic syntax: Character Classes in ...
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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 right place. Java Practices -> Implementing equals ...
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Tomcat starts but Home Page does NOT open on browser with URL http://localhost:8080

August 4th, 2018 by App Shah

how to solve Apache Tomcat 404 Page not found error?

Today I was running Apache Tomcat from Eclipse and while accessing URL http://localhost:8080 found HTTP Status 404 – Not Found error. The origin server did not find a current representation for the target resource or is not willing to disclose ...
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Ideal eclipse.ini file setup for your Eclipse Environment – Best Practice for MacOS and Windows

August 3rd, 2018 by App Shah

As a Java Developer, we spend almost half of our time developing world class Java Applications. Your application might be touching thousands of users and making their lives easy in this very complex world :) Here in this tutorial we will go over ...
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How to Fix Eclipse Startup Error after Removing old Java Version from Laptop/Desktop?

August 3rd, 2018 by App Shah

Eclipse - How to fix No Java Virtual Machine was found Error

Are you getting below eclipse startup error? A Java Runtime Environment (JRE) or Java Development Kit (JDK) must be available in order to run Eclipse. No Java virtual machine was found after searching the following locations: ...
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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 list convert HashMap to ArrayList, Find unique values from ...
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Java Method Hiding and Overriding: Override Static Method in Java

July 19th, 2018 by App Shah 4

Java Method Hiding and Overriding - Crunchify Tips

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 superclass's method. Overriding and Hiding Methods The ability of ...
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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) map backed by the specified map and we will use one more ...
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Ever wondered difference between Dynamic Web Module 3.0 and 3.1? How to Setup 3.1 Correct way in Eclipse?

June 17th, 2018 by App Shah

You must have seen hundreds of time Dynamic Web Module option in Eclipse. Do you know purpose of this option and what exactly it is for? Sometime back we have written an article on How to fix "Cannot change version of project facet Dynamic Web ...
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