Whenever I study Garbage Collector I hear the term object Graph. What does it mean exactly?
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Whenever I study Garbage Collector I hear the term object Graph. What does it mean exactly?
Objects have references to other objects which may in turn have references to more objects including the starting object. This creates a graph of objects, useful in reachability analysis. For instance, if the starting object is reachable (say it’s in a thread’s local stack) then all objects in the graph are reachable and an exact garbage collector cannot harvest any of these objects. Similarly, starting with a set of live objects (roots) if we create a list of all reachable objects, all other objects are garbage – fair game for collection.