019: Effective Java for Android developers : Item 4

Singer and Android developer Donn Felker explores Joshua Bloch's fourth Item: Enforce noninstantiability with a private constructor. Stay tuned, cause we got more of these quick ones coming. Effective Java (2nd Edition) - Joshua Bloch Enforce noninstantiability with a private constructor. Examples where you don't want class to be instantiated class that groups static methods and static fields (Util like classes think java.lang.Math/java.util.Arrays) class that groups static methods (including factory methods) for objects implementing specific interfaces (think java.util.Collections) class that group methods on a final class (vs. extending the class) Considerations Makes no sense to instantiate such "Util" classes Private constructors prevent instantiation Important side effect: prevents subclassing Contact us: @fragmentedcast [twitter.com] @donnfelker [twitter.com] @kaushikgopal [twitter.com]