Type Resolution Rules

These are rules which resolve java Class files for comparisson, as opposed to a String

LooseCoupling

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();
 }
}
  
      
		

CloneMethodMustImplementCloneable

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;
 }
}