Effective Java Item 7: Eliminate Obsolete Object References

My disquisition on Item 7 of Effective Java by Joshua Bloch: Eliminate Obsolete Object References. I also cover garbage collection, WeakHashMaps and Weak References.

GitHub repository: https://github.com/TRahulSam1997/Effective-Java-Joshua-Bloch/tree/main/src/main/java/Item7
Joshua Bloch's GitHub repository: https://github.com/jbloch/effective-java-3e-source-code/tree/master/src/effectivejava/chapter2/item7
Book: https://www.amazon.com.au/Effective-Java-Joshua-Bloch/dp/0134685997/
Full playlist: https://youtube.com/playlist?list=PLcJ6nqGscKrd2UxeLTY-fIr0dzdMIOHAK

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{Reference Links & Resources For Further Study}
https://java-programming.mooc.fi/part-5/4-objects-and-references
https://www.baeldung.com/java-int-char-cannot-be-dereferenced
Garbage Collection Algorithms: Mark Sweep, Generation Hypothesis and JIT code injection - https://youtu.be/ZhbIReLe-r8
Garbage Collection Algorithms: Concurrent Mark Sweep, Fragmentation and Compaction, Lost Writes - https://youtu.be/trkYGEGT6_w
C Programming: What does Dereferencing a Pointer Mean? - https://youtu.be/VvHDY5STNhU
https://stackoverflow.com/a/67656111/6367109
https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/ref/WeakReference.html
https://stackoverflow.com/questions/299659/whats-the-difference-between-softreference-and-weakreference-in-java
https://wiki.c2.com/?CanonicalizedMapping
https://www.philosophicalgeek.com/2014/09/03/practical-uses-of-weakreference/
https://www.geeksforgeeks.org/scheduledthreadpoolexecutor-class-in-java/
https://docs.oracle.com/javase/8/docs/api/java/util/LinkedHashMap.htm #removeEldestEntry-java.util.Map.Entry-
https://www.geeksforgeeks.org/asynchronous-synchronous-callbacks-java/
How to garbage collect callbacks with weak references in Java? - https://stackoverflow.com/q/74373440/6367109
https://stackoverflow.com/questions/65967486/android-difference-between-callback-and-listener
https://www.baeldung.com/java-profilers

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