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Is null an object in java?
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Explain treeset?
What design pattern you have used in your project? I answered Factory pattern, how it is implemented? What are its advantage? Do know about Abstract Factory?
write the hierarchy of component class?
Memory management in JAVA
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Why we use static and synchronized in method for single thread model example: public static synchronized add(){}
Why singleton is not thread safe?
Can memory leak in java?
Program to find greatest prime number in n numbers?
What is the default value of an object reference declared as an instance variable?
what modifiers are used with top-level class?
What is an i/o filter?
What is mean by encoding?
Core Java 
