Fragmented - Android Developer Podcast

019: Effective Java for Android developers : Item 4

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Singer and Android developer Donn Felker explores Joshua Bloch's fourth Item: Enforce noninstantiability with a private constructor.

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  • Effective Java (2nd Edition) - Joshua Bloch

    • Enforce noninstantiability with a private constructor.

    Examples where you don't want class to be instantiated

    1. class that groups static methods and static fields (Util like classes think java.lang.Math/java.util.Arrays)
    2. class that groups static methods (including factory methods) for objects implementing specific interfaces (think java.util.Collections)
    3. class that group methods on a final class (vs. extending the class)

      4. Considerations

      • Makes no sense to instantiate such "Util" classes
      • Private constructors prevent instantiation
      • Important side effect: prevents subclassing
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          Fragmented - Android Developer PodcastBy Donn Felker, Kaushik Gopal
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