What are abstract classes and anonymous classes?

0 Answers   Flextronics, Thomson Reuters, Virtusa,

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Nullpointer exception is a very common exception. Why is it not made as a checked exception?

2 Answers   Ness Technologies,

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Why is a constant variable important?

0 Answers  

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public class Base { public void myMethod(int a,intb) {} } // Uses myMethod and then hides it. public class DerivedOne extends Base { private void myMethod(int a,int b); } will this compile or not .yes or no. why

2 Answers  

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What is Runtime class and its purpose?

2 Answers  

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What are the data types supported by java? What is autoboxing and unboxing?

0 Answers  

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I want to persist data of objects for later use. What is the best approach to do so?

0 Answers  

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Nested classes VS Inner classes?

3 Answers   Infosys,

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How is hashset defined in java?

0 Answers  

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What are the special characters?

0 Answers  

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How is java hashmap implemented?

0 Answers  

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Does garbage collection occur in permanent generation space in jvm?

0 Answers  

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