I made/received a few jars of different jams today. They're definitely not preserved for longevity, and expect them to last at most 3 weeks in the refrigerator unopened (simply heated the jam until it gelled and then put it in the jars, flipped them over). I reaally want to taste the different kinds I have and save them for later-- can I freeze the opened jams and expect to eat them later?

Thanks in advance! (I plan to begin proper jam making techniques soon.)