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17205770
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2013-06-20T05:15:07.367
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2013-06-20T05:15:07.367
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You need to call getDeclaredFields() on class A itself and then use reflection to set the field accessible thusly <pre><code>import java.lang.reflect.Field; import java.lang.reflect.Modifier; public class Test{ public static void main(String args[]){ B someB = new B(); B otherB = new B(); Field uniqueField = null; for(Field f : A.class.getDeclaredFields()){ if(!Modifier.isFinal(f.getModifiers())) continue; if(!UNIQUE.class.isAssignableFrom(f.getType())) continue; uniqueField = f; break; } if(null == uniqueField) throw new NullPointerException(); uniqueField.setAccessible(true); try{ System.out.println(uniqueField.get(someB) != uniqueField.get(otherB)); }catch(IllegalArgumentException | IllegalAccessException e){ throw new RuntimeException(e); } } } class UNIQUE{ } class A{ private final UNIQUE u; private final String someOtherMember = ""; A(){ u = new UNIQUE(); } } class B extends A{ } </code></pre> if you don't have a direct reference to class A or if there is more than one superclass that has this unique field then you can loop over each one (making sure to check at each stop that you didn't climb all the way to object) by doing something more like this in the example above <pre><code> Class<?> clazz = someB.getClass(); classClimb: do{ for(Field f : clazz.getDeclaredFields()){ if(!Modifier.isFinal(f.getModifiers())) continue; if(!UNIQUE.class.isAssignableFrom(f.getType())) continue; uniqueField = f; break classClimb; } }while(Object.class != (clazz = clazz.getSuperclass())); if(null == uniqueField) throw new NullPointerException(); uniqueField.setAccessible(true); try{ System.out.println(uniqueField.get(someB) != uniqueField.get(otherB)); }catch(IllegalArgumentException | IllegalAccessException e){ throw new RuntimeException(e); } </code></pre> Remember that in that case you'll have to either do the reflection on every single object, do some caching, or have multiple reflection sites that are specific to each expected superclass.
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