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to be found inside the object in the heap, and the object denoted by the field reference is also to be found in the heap An example of how memory is organized during execution is depicted in Figure 91 It shows two live threads (t1 and t2) and their respective runtime stacks with the activation records The diagram shows which objects in the heap are referenced by local references in the method activation records The diagram also shows field references in objects, which refer to other objects in the heap Some objects have several aliases An object in the heap is said to be reachable if it is referenced by any local reference in a runtime stack Additionally, any object that is denoted by a reference in a reachable object is also said to be reachable Reachability is a transitive relation Thus, a reachable object has at least one chain of reachable references from the runtime stack Any reference that makes an object reachable is called a reachable reference An object that is not reachable is said to be unreachable A reachable object is alive, and is accessible by a live thread Note that an object can be accessible by more than one thread Any object that is not accessible by a live thread is a candidate for garbage collection When an object becomes unreachable and is waiting for its memory to be reclaimed, it is said to be eligible for garbage collection An object is eligible for garbage collection if all references denoting it are in eligible objects Eligible objects do not affect the future course of program execution When the garbage collector runs, it finds and reclaims the storage of eligible objects However, garbage collection does not necessarily occur as soon as an object becomes unreachable From Figure 91 we see that objects o4, o5, o11, o12, o14, and o15 all have reachable references Objects o13 and o16 have no reachable references and are, therefore, eligible for garbage collection From the discussion above we can conclude that if a composite object becomes unreachable, its constituent objects also become unreachable, barring any reachable references to the constituent objects Although the objects o1, o2, and o3 form a circular list, they do not have any reachable references Thus, these objects are all eligible for garbage collection On the other hand, the objects o5, o6, and o7 form a linear list, but they are all reachable, as the first object in the list, o5, is reachable The objects o8, o10, o11, and o9 also form a linear list (in that order), but not all objects in the list are reachable Only the objects o9 and o11 are reachable, as object o11 has a reachable reference The objects o8 and o10 are eligible for garbage collection The lifetime of an object is the time from its creation to the time it is garbage collected Under normal circumstances, an object is accessible from the time when it is created to the time when it is unreachable The lifetime of an object can also include a period when it is eligible for garbage collection, waiting for its storage to be reclaimed The finalization mechanism (see p 396) in Java does provide a means for resurrecting an object after it is eligible for garbage collection, but the finalization mechanism is rarely used for this purpose.

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The automatic garbage collector determines which objects are not reachable and, therefore, eligible for garbage collection It will certainly go to work if there is an imminent memory shortage Automatic garbage collection should not be perceived as a license for uninhibited creation of objects and then forgetting about them However, certain programming practices can nevertheless help in minimizing the overhead associated with garbage collection during program execution Certain objects, such as files and network connections, can tie up resources and should be disposed of properly when they are no longer needed In most cases, the

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convenient facility for such purposes, as it will always be executed, thereby ensuring proper disposal of any unwanted resources To optimize its memory footprint, a live thread should only retain access to an object as long as the object is needed for its execution The program can allow objects to become eligible for garbage collection as early as possible by removing all references to the object when it is no longer needed Objects that are created and accessed by local references in a method are eligible for garbage collection when the method terminates unless reference values to these objects are exported out of the method This can occur if a reference value is returned from the method, passed as argument to another method that records the reference value, or thrown as an exception However, a method need not always leave objects to be garbage collected after its termination It can facilitate garbage collection by taking suitable action, for example, by nulling references

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