How does the state of an object change after the garbage collector finishes working with it?

After the Garbage Collector in Java finishes working with an object, that object is considered inaccessible and its memory is freed. The state of the object effectively becomes 'undefined', as the memory it occupied may be overwritten with new data. A programmer cannot access this object — references to it are either absent or invalid. In Java, there is no explicit way to 'revive' an object after it has been collected by the garbage collector.