Your use of Stack Overflow’s Products and Services, including the Stack Overflow Network, is subject to these policies and terms.In Java, as soon as an object no longer has any references, it becomes eligible for deletion, but the JVM decides when the object is actually deleted.For example, newer objects are much more likely to be deleted than older objects.So if you wait a bit between sweeps, you can delete most of the new generation of memory, while moving the few survivors to longer-term storage.The charity Doctors Without Borders says hundreds of thousands of people who have been forced to very rural areas of Borno are now totally dependent on outside aid for survival. Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Another 200,000 Nigerians have taken refuge in neighboring states.Because properly knowing something is no longer referenced isn't easy. What if you have two objects referencing each other? Extending that line of thinking to resolving any arbitrary data structure, and you'll soon see why the JVM or other garbage collectors are forced to employ far more sophisticated methods of determining what's still needed and what can go.an object (or a value) should be deleted, and leaves that to the implementation (likewise for R5RS).That longer term storage can be scanned much less frequently.Immediate deletion via manual memory management or reference counting is much more prone to fragmentation.That kidnapping sparked worldwide anger and led to the formation of the Bring Back Our Girls movement.Nearly four years later, more than 100 of the Chibok girls are still missing.The Java Virtual Machine assumes no particular type of automatic storage management system an object gets deleted, and you could code as-if it does not happen (by reasoning in an abstraction where you ignore that).Of course you need to care about memory consumption and set of living objects, which is a question.It somehow requires or suggests a garbage collector but leaves the details to the implementation. Remember that programming languages are (of syntax, semantics, etc...), not software implementations.A language like Java (or its JVM) has many implementations.