creating an instance of an object

hello

so i had found a bug in my code and was wondering if there was an easier way to code this
basically buffaction
on perform buff action

foreach enchantable target in action targets

i had this:

target.add(action.buff);

when i negated the duration stat it would actually negate the stat multiple times for all the creatures that were being buffed

what i had to do was
foreach enchant target in action targets 
create a new instance
Buff buff = new Buff();

set the property one by one 
then

target.add(buff);


so what is happening is that i am THAT buff object to each of the creatures then each time i go through the creatures it negates one when the turn hits so a 3 turn duration card with 3 creatures on the field could end that turn if it targets 3 creatures.

whereas i create a new instance and then apply it....which is actually what i wanted but didnt reallize...BUT if i want to create an exact copy of that object is there an easier way to do this then actually equalling all the properties out?


for instance 
buff.stat = action.buff.stat;
buff.amount = action.buff.amount;

and like 10 other properties i have


hope that makes sense
thanks for always helping!