Basic Java Interview Question and Answers

49. How can we force the garbage collector to run?
  Garbage collector can be run forcibly using "System.gc()" or "Runtime.gc()".
 
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50. What restrictions are placed on method overriding?
 
  • Overridden methods must have the same name, argument list and return type.
  • The overriding method may not limit the access of the method it overrides.
  • The overriding method may not throw any exceptions that may not be thrown by the overridden method.
 
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51. What is a package?
  A package stores a group of related classes and interfaces. They eliminate the conflicts in class names in different of classes.
 
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52. What is memory footprint?
  When JVM needs more memory then it does the garbage collection, and sweeps all the memory which is not being used.
 
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