A few questions about Java garbage collection

What is the purpose of 1.Java garbage collection? When does garbage collection take place?

A: The purpose of garbage collection is to identify and discard objects that are no longer in use in your app to free and reuse resources.

What will 2.system.gc () and RUNTIME.GC () do?

Answer: These two methods are used to prompt the JVM for garbage collection. However, it is up to the JVM to recover immediately or defer.

When is the 3.finalize () method called? What is the purpose of the destructor?

A: The garbage collector calls the object's Finalize () method before releasing the memory that the object occupies. It is generally recommended that the resources held by the object be disposed of in this method.

4. If the object's reference is set to NULL, will the garbage collector immediately release the memory occupied by the object?

A: No, in the next garbage collection cycle, this object will be recoverable.

A few questions about Java garbage collection