The Road Not Taken? — Kotlin or Java, Photo by Jon Tyson on  Unsplash The first one-million dollar question that comes to every Android developer while starting a new projec ...

エポック秒から指定されたタイムゾーンの日付を取得する,エポック秒とタイムゾーンを指定して日付を取得する。 // 2017/10/01 00:00:00 のエポック秒 Instant instant = Instant.ofEpochSecond(...

文字列連結のパフォーマンス,Java本格入門で紹介されていた文字列連結を試す。1 10万回 1万回 5千回 千回 StringBuilder 7.4 0.7 0.5 0.1 String#concat 11.5 1.8 1.5 0.6 ＋演算子 3453.5 106....

カレンダーの行数を求める,カレンダーの行数を求める。 算出方法は以下を参考。 https://biz.hino-tama.com/creative/blog0012/ int calendarRows(LocalDate date) { if (date == null) { throw...

JAVA and Object Oriented Programming Basic,JAVA and Object Oriented Programming Basic Ashikur Rahman Any real-life entity/object have two parts Properties (Describes its height, we...

Build a PowerSet, What is a PowerSet? Why is it called a PowerSet? Is it good or bad for us? Will I need it on my next Angular/Machine learning project? If we look at Wikipedia for...

IntelliJ or Eclipse?, 原文链接：IntelliJ or Eclipse?

Kottpd — HTTP Server in pure Kotlin,In today’s post I would like to talk about one of the projects I’m working on. I define it as light HTTP framework and it is made in pure Kot...

Writing Java Command Line Tools is Cumbersome... Or is it???, Simple Java Tools The JDK comes with a lot of great command-line tools on its own that support development. But on eve...

Java 8 Stream Cheatsheet,Originally posted at www.gunnargissel.com Streams are a way of working with objects in a collection. Streams allow a person to say what they want to have a...

MockitoでClassオブジェクトを返す,MockitoでClassオブジェクトを返すメソッドをモック化しようとした。 Foo foo = mock(Foo.class); when(foo.getBar()).thenReturn(Bar.class); Enter fullscr...

Deploying Java Apps with Kubernetes and the Ambassador API Gateway,In this article you’ll learn how to deploy three simple Java services into Kubernetes (running locally via the n...