UtilityClassWithPublicConstructor.md

Pattern: Utility class with public constructor

Issue: -

Description

A class which only contains utility variables and functions with no concrete implementation can be refactored into an object or an class with a non-public constructor. Furthermore, this rule reports utility classes which are not final.

Example of incorrect code:

class UtilityClassViolation {

    // public constructor here
    constructor() {
        // ...
    }

    companion object {
        val i = 0
    }
}

open class UtilityClassViolation private constructor() {

    // ...
}

Example of correct code:

class UtilityClass {

    private constructor() {
        // ...
    }

    companion object {
        val i = 0
    }
}
object UtilityClass {

    val i = 0
}

Further Reading

• Detekt - UtilityClassWithPublicConstructor