Bereken het gelijkenispercentage tussen twee objecten in Java

Twee objecten van hetzelfde type worden met elkaar vergeleken. Als uitkomst krijg je een percentage van gelijkenis.

Code

public class Similarity {

    public int equalify(Object object1, Object object2) throws InstantiationException, IllegalAccessException {
        Map<String, Object> obj1Fields = getFieldNamesAndValues(object1);
        Map<String, Object> obj2Fields = getFieldNamesAndValues(object2);
        int same = 0;

        for (Map.Entry<String, Object> entry : obj1Fields.entrySet()) {
            Object val1 = entry.getValue();
            Object val2 = obj2Fields.get(entry.getKey());

            if (String.valueOf(val1).equals(String.valueOf(val2))) {
                same++;
            }
        }

        return (int) (((double) same / (double) obj1Fields.size()) * 100);
    }

    private Map<String, Object> getFieldNamesAndValues(final Object valueObj) throws IllegalArgumentException, IllegalAccessException {
        Class c1 = valueObj.getClass();
        Map<String, Object> fieldMap = new HashMap<String, Object>();
        Field[] valueObjFields = c1.getDeclaredFields();

        for (int i = 0; i < valueObjFields.length; i++) {
            String fieldName = valueObjFields[i].getName();
            valueObjFields[i].setAccessible(true);
            Object newObj = valueObjFields[i].get(valueObj);
            fieldMap.put(fieldName, newObj);
        }
        return fieldMap;
    }
}

Test

@Test
public void test() throws InstantiationException, IllegalAccessException {
    Equalifier equalifier = new Equalifier();    

    Contact contact1 = new Contact();
    Contact contact2 = new Contact();

    contact1.setLanguage("NL");
    contact1.setFirstname("Laurent");

    contact2.setLanguage("NL");
    contact2.setFirstname("Laurent");
    contact2.setLastname("Hinoul");

    assertEquals(equalifier.equalify(contact1, contact2), 66);
}