adam bien's blog

Utility classes act a a bag of related static methods with a private constructor:

package java.lang;

public final class Math {

    /**
     * Don't let anyone instantiate this class.
     */
    private Math() {}

    public static double sin(double a) { /**/}

Java 8 introduces a leaner alternative -- the "utility interface" and makes the private anti-constructor superfluous:

public interface Math {
    public static double sin(double a) { /**/}
}

See e.g. Contexts.java from the nano project.

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