a2zinterviews

1.	What is garbage collection?
	If no reference to an object, that object is assumed to be no longer needed, and the memory occupied by the object can be reclaimed. This is known as garbage collection.
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2.	What are the disadvantages of reference counting in garbage collection?
	An advantage of this schema is that it can run in small chunks of time closely interwoven with the execution of the program. This characteristic makes it particularly suitable for real time environments where the program can't be interrupted for very long. A disadvantage of reference counting is that it does not detect cycles. A cycle is two or more objects that refer to one another. Another disadvantage is the overhead of incrementing and decrementing the reference count each time. Because of these disadvantages, references counting currently is out of favor.
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3.	What class of exceptions are generated by the Java run time system?
	The Java runtime system generates Run time exception and Error exceptions.
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4.	Describe the Garbage Collection process in Java?
	The JVM spec mandates automatic garbage collection outside of the programmer’s control. The System.gc() or Runtime.gc() is merely a suggestion to the JVM to run the GC process but is NOT guaranteed.
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