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Java / Garbage collection

When to override finalize method in Java?

If a Java class hold resource like input-output streams such as File, JDBC connection then you should override finalize and call its close() method from finalize. Though not guaranteed, finalize method acts as the last attempt to release the resources.

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What is the purpose of garbage collection in Java? How does Garbage Collection work in Java? Explain the structure of heap. Is garbage collection in Java automatic? When does an Object become eligible for Garbage collection in Java? How will you identify minor and major garbage collection in Java? Difference between system.gc() and runtime.gc(). How to identify if GC resulted due to calling System.gc()? What is finalize method in Java? How many times does the GC calls the finalize() method for an object? What does System.gc() and Runtime.gc() methods do ? If an object reference is set to null, will the GC immediately free the memory held by that object ? How do you trigger garbage collection through Java code? Does finalize method automatically chain like constructors? How to improve the possibility of JVM running of finalize method? Does Java support destructors? When to override finalize method in Java? What is the access modifier for finalize method? Best practice for calling super class finalize method. Can we call finalize method explicitly? What to avoid when overriding finalize method? What are the Garbage collection (GC) roots? Explain Stop-The-World (STW) pauses. What is JVM ergonomics? What is the default garbage collector on a server class Machine. What are the 2 JVM tuning parameters for parallel collector? What is the default garbage collector in Java? Explain Serial garbage collector. How to find which Garbage collector is running? Is objects with circular reference, object linked to each other, garbage collected? Explain JVM Escape Analysis.
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