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TIOBE - Java Coding Standard

Rule:  TypeResolution2Checked automatically with code checker

This rule is Obsolete
Synopsis:clone() method should be implemented only if implementing Cloneable interface
Severity Level:6

The method clone() should only be implemented if the class implements the Cloneable interface with the exception of a final method that only throws CloneNotSupportedException. This version uses PMD's type resolution facilities, and can detect if the class implements or extends a Cloneable class
public class MyClass {
 public Object clone() throws CloneNotSupportedException {
  return foo;