21 important Java/J2EE interview questions

Published on by javainterviewseries

21 important Java/J2EE interview questions: -

This following part will cover the most asked Java/J2EE interview questions during Java/J2EE interview. So have a look on the same and do revise it when ever you go for the Java/J2EE interview questions interview.

Normally the Java’s interviewer starts with.....

  • What is the difference among JVM Spec, JVM Implementation, JVM Runtime?
  • What are JDK and JRE?
  • What is JIT?
  • What is a JVM heap?
  • What is sandbox?
  • What is Locale?
  • What is a ResourceBundle class?
  • How will you get the platform dependent values like line separator, path separator?
  • How does garbage collector decide which objects are to be removed? Can garbage collector be forced?
  • What is the final keyword denotes w.r.t class, method and variable?
  • What are the methods in Object?
  • Can you instantiate the Math class?
  • What is the difference between the instanceof and getclass, these two are same or not?
  • Can main method be declared final?
  • What is a native method?
  • Does Java provide any construct to find out the size of an object?
  • Is Empty .java file a valid source file?
  • Can a .java file contain more than one java classes?
  • What is the difference between an argument and a parameter?
  • What are the different scopes for Java variables?
  • What are wrapper classes?

Also see the following video on on FlyWeight Pattern which will help you to boost your interview preparation: -

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wow nice and useful blog to all