Gross.java

MyModel newModel = getNewModel();
MyModel oldModel = getOldModel();

String newValue = null;

newValue = newModel.getName();
if (newValue != null) {
    oldModel.setName(newValue);
}

newValue = newModel.getEmail();
if (newValue != null) {
    oldModel.setEmail(newValue);
}

newValue = newModel.getAddress();
if (newValue != null) {
    oldModel.setAddress(newValue);
}