What is the difference between Error, defect,fault, failure and mistake?
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What do you understand by overloading and overriding in java?
What is the difference between C++ & Java?
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what is the main differene between synchronize() method and Synchronize{}block?
When super keyword is used?
FOR EXAMPLE WE R HAVING TWO LIST ELEMENTS ..BOTH LISTS CONTAINS ID,NAME,PLACE ..I NEED TO COMPARE BOTH IDS IN TWO LISTS,IF ID'S R SAME MEANS WE HAVE ADD THE DETAILS(LIKE NAME,PLACE) TO MAP...HOW IS POSSIBLE ?CAN ANY ONE SUGGEST?
What is a treeset class?
how to handle a singleton service locator. when multiple threads are trying to get the singleton object in same time
Is a char always 1 byte?
Explain restrictions on using enum?
Is java util list serializable?
Can you declare the main method as final?
Can set contain duplicates?
Core Java 
