title: Java/Serializable - Overwrite only changed objects
body: <p>Is it possible to deserializable object from a file and then serializable only few of them into the same file? Of course numbers of object before and after must be the same. I don't want to add new objects into file, but overwrite changed objects. 
  For example there are about 1000 objects which I get from file 'file.ser'. I deserializable them, change only 3 and want to overwrite these into same file. Is it possible?</p>