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Mar 24, 2010 · The Java finalize() method is not a destructor and should not be used to handle logic that your application depends on. The Java spec states there is no guarantee that the finalize method is called at all during the livetime of the application. What you problably want is a combination of finally and a cleanup method, as in:
Although the question was asking about the Object.finalize method, the subject really is about the finalization mechanism as a whole. This mechanism includes not only the surface API Object.finalize , but it also includes specifications of the programming language about the life cycle of objects, and practical impact on garbage collector implementations in JVMs.
Instead, the Java garbage collector appends the objects to a special queue for the finalization process. Usually it's performed by a special thread called a "Reference Handler" on some Java Virtual Machines. During this finalization process, the "Finalizer" thread will execute each finalize() method of the objects.
Dec 12, 2017 · 9. Phantom references are general replacement for finalize(). Many classes from Java runtime are already using them. Using Phantom references is a bit laborious, you have to maintain own reference list and postmortem processing thread. On the other hand you are fully in control. Here is a simple example of Phantom reference setup.
Jun 29, 2013 · 1. Firstly,The purpose of finalization is to give an unreachable object the opportunity to perform any cleanup, before the object gets garbage collected. For example, Closing an opened database connection. The finailze() method should be overridden for an object to include the clean up code or to dispose of the system resources that should to ...
Feb 19, 2010 · 3. The part about finalize() being called only once applies only to the calls from the GC. You can imagine the object as having a hidden flag " finalize() was called by the GC", and the GC checking that flag to know what to do with the object. The flag is not impacted in any way by your own handmade calls to finalize().
Oct 1, 2008 · Implement a close() method and document that it needs to be called. Implement finalize() to do the close() processing if you detect it hasn't been done. Maybe with something dumped to stderr to point out that you're cleaning up after a buggy caller. It provides extra safety in an exceptional/buggy situation.
Mar 4, 2012 · This kind of object resurrection may lead to exhausting your resources if it gets out of control. Also, watch out for exceptions in finalize() - they may halt the finalization, but there's no automatic way for your program to learn about them. You need to wrap the code in try-catch blocks and propagate the information yourself.
Jul 30, 2014 · I understand the method may not be removed in the near future but I think it best to find a replacement for finalize right away. finalize() in class A is mainly focused destroying an object of long type which is a protected member variable and on printing certain messages to log. finalize() in class B simply prints certain messages to log.
Apr 17, 2012 · system.gc() method notifies the JVM that the garbage collector can run now to clear the memory by deleting unused objects. As per the java doc: Calling the gc method suggests that the Java Virtual Machine expend effort toward recycling unused objects in order to make the memory they currently occupy available for quick reuse.
