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Why we override equals() method?
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What was java originally called?
If there is no implementation of MARKER INTERFACE in java. Then how compiler come to know about specification.
Why do we need wrapper classes?
What is the use of static keyword in "public static void main()"
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What does the “final” keyword mean in front of a variable? A method? A class?
When super keyword is used?
This is related to threads. I have a class with synchronized method m1(). Can I create different instances of this class and execute the m1() for different threads?
In what type of containers, Border layout is a default layout?
Explain what pure virtual function is?
WHAT IS MARKER INTERFACE,AND NO METHODS IS NOT THERE ON THAT INTERFACE THEN WHY WE USED IN JAVA?
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I have a class which is abstract which contains only the abstract methods. This is similar to an interface. Then, if i have given a choice to choose one of them. Which one i have to choose and why?
Core Java 
