Core java

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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 the user’s input. It should contain only characters from a-z, A-Zor 0-9. Here is simple regex for it. ^[a-zA-Z0-9]*$ Here is the explaination of above regex. ^ : start of […]

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 simplest and oldest way to create file.Here is simple snapshot to create a file in java. [crayon-6a2a8955b98f2603824384/] Using java.nio.file.Files from […]

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 [crayon-6a2a8955b9f08397461067/] That’s pretty simple. Access enum by name You can simply use . operator to access enum but if you have […]

In this tutorial, we will see  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 retrieve the collection of elements. This framework has many interfaces and classes which makes programmer life easy. Let’s go through […]

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 features which will change the way you do programming. Here is a list of features you need to know to […]

In this post, we will see about Java 8 optional. Did you ever get NullPointerException as Java developer? If you are experienced Java developer, you might have got NullPointerException at some point of time. You might agree that NullPointerException is pain for novice or expert core Java developer. You have to put a lot of […]

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In this post, we will see about Strategy design pattern in java. Strategy design pattern allows us to change algorithm implementation at runtime.Strategy design pattern provides multiple algorithms and client can choose algorithm based on their needs with the help of composition. Strategy design pattern example Let’s understand this with the help of simple example. […]