JVM: garbage collection finalise

Java/Performance and Memory/PerformanceAndMemoryTuning.md

@@ -57,6 +57,11 @@ String `intern()` ensures that for the same value of string same object is re-us
 ### Garbage collection
 Any object which cannot be reached from stack,metaspace will be eligible for garbage collected.
 `System.gc()` is a hint to JVM to do garbage collection
+
+#### finalise()
+> Note: Depreciated since java 9
+
+It is executed when object is destroyed during gc. It had a lot of inherent issues like infinite loops, memory leaks ,deadlocks etc
 ## Runtime Optimization
 ### JVM Params
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