These are rules which resolve java Class files for comparisson, as opposed to a String
Avoid using implementation types (i.e., HashSet); use the interface (i.e, Set) instead
This rule is defined by the following Java class: net.sourceforge.pmd.typeresolution.rules.LooseCoupling
Here's an example of code that would trigger this rule:
import java.util.ArrayList;
import java.util.HashSet;
public class Bar {
// Use List instead
private ArrayList list = new ArrayList();
// Use Set instead
public HashSet getFoo() {
return new HashSet();
}
}
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
This rule is defined by the following Java class: net.sourceforge.pmd.typeresolution.rules.CloneMethodMustImplementCloneable
Here's an example of code that would trigger this rule:
public class MyClass {
public Object clone() throws CloneNotSupportedException {
return foo;
}
}