.gitignore Create a file, and name it as .gitignore in the root directory, then add names and patterns for any files and directories that should not be added to the repository. Use asterisk (“*”) as a wildcard. E.g. “*.class” will ignore all files that have the “.class” extension. Remember to add the .gitignore file to the repository so that... » read more
The definition of “mediator” is, a person who attempts to make people involved in a conflict come to an agreement; a go-between. Problem Solution The Mediator pattern suggests that all direct communication should be ceased between the components. Instead, these components must collaborate indirectly, by calling a special mediator object that redirects the calls to... » read more
You may try this with Kotlin Playground -> https://play.kotlinlang.org Swap two values w/o temp variable a = b.also { b = a } is equivalent to followings: Enum Reverse Look-up
In Kotlin, a null-able value without being sure it is not null cannot be accessed. (Checking for null in conditions), or asserting that it is surely not null using the !! sure operator, accessing it with a ?. Safe Call, or lastly giving something that is possibly null a default value using the ?: Elvis... » read more
Kotlin/Java enums are very powerful and important part of the Java language. Even though they can do so much, it is very common to see them either being used incorrectly or not used at all. In this blog post I want to remind you what Java enums can do and show some of the usage... » read more
Extension methods enable you to “add” methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type. Add retry() into Java Runnable class Reference Extension Methods in C#
Enumset is a powerful collection in Java to replace bit fields. This article will explains how to use EnumSet to create a RBAC (Role-Based Access Control). Now, let’s see how we can use EnumSet to create a RBAC. Inside the setup method, a series of roles with specific access right in a given system has been defined... » read more
To Overcome NullPointerException The Java 8’s Optional is meant for alleviating the occurrence of NullPointerException. NullPointerException is the result of Null References, Null Reference is also known as The Billion Dollar Mistake. The Billion Dollar mistake was coined by a British computer scientist, Sir Charles Antony Richard Hoare. Null pointers are the single biggest source... » read more