# Replacing Utility Classes With Interfaces And Java 8

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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