A Collection in simple terms means when a group of similar things, often a group created by someone is known as a collection. A collection when collected works like a container – it groups multiple ...

Have you ever wondered why the java.util.Collections class includes various “empty” class methods, which return immutable empty collections and immutable empty iterators? This post answers this ...

Java 2 SDK バージョン5.0をご使用時の留意事項 Java 2 SDK バージョン5.0(1.5.0)では、新たに型安全性のための「型チェックの技法」が導入されています。この新しい機能は、従来のJava 2 SDK 1.4.XベースのCollectionsフレームワークの機能と整合しません。このため、Java ...

Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded, and that objects are ...