TIOBE - Java Coding Standard

Rule: Design26

Synopsis:	Class cannot be instantiated and does not provide any static methods or fields
Language:	Java
Severity Level:	1
Category:	Design

Description:

A class that has private constructors and does not have any static methods or fields cannot be used.

/* This class is unusable, since it cannot be
 instantiated (private constructor),
 and no static method can be called.
 */
public class Foo {
 private Foo() {}
 void foo() {}
}