Core java Archive

Java interview questions

I have written a lot of java interview questions and this is index posts for all java interview questions. I will keep adding more interview questions to this post. Core Java Core java interview questions …

Install Jenkins on Mac OS X

In this tutorial, we will see how to install Jenkins on Mac OS X. Step 1:Open browser and enter URL https://jenkins.io/download Step 2:Scroll down the page until you see the Mac OS X section then …

Java Regex for alphanumeric characters

In this post, we will see how to create regex alphanumeric which will create only alphanumeric characters. There are times when you need to validate user’s input. It should contain only characters from a-z, A-Z …

Java – Create new file

There are many ways to create a file in java. Creating a file is a very easy task. We will learn 5 different ways to Create a file. Using java.io.File class’s createNewFile method This is …

Java enum with String

In this quick tutorial, how to create String constants using enum, convert String to enum etc. You can go though complete enum tutorial here. Let’s create java enum String constants. Create java enum String  …

Collections in java

In this tutorial, we will seeĀ  about Collections in java. Collection framework is core part of java programming language. It is used in almost all the applications. Collections framework provides a way to store and …

Java 8 tutorial

In this post, we will see about Java 8 tutorial. I have written a lot of tutorials on Java 8. This is index post for all Java 8 posts. Java 8 has lots of new …

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