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|Interview Questions and Answers|
|Must know at all levels. Among Top 10 frequently asked questions in Java. Very frequently asked to fresh graduates or less experienced professionals.|
|Ans. Its a facility for code reuse and independent extension wherein a derived class inherits the properties of parent class. |
|Help us improve. Please let us know the company, where you were asked this question :|
|Like Discuss Correct / Improve  inheritance  object oriented programming (oops)  oops concepts  oops concepts  java concepts  code reuse  code re-use   classes  derived classes Asked in 14 Companies basic   frequent|
|Why do we need Inner classes ? Cant we just work with outer classes wherever we implement Inner classes ?|
|Differences between abstract class and interface ?|
|What are different types of classes ?|
|Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?|
| Which of the following can be marked static ?|
a. Methods , Variables and Initialization Blocks.
b. Methods , Variables , Initialization Blocks and Outer Classes and nested Classes.
c. Methods , Variables , Initialization Blocks and Outer Classes.
d. Methods , Variables , Initialization Blocks and nested Classes
| What is the difference between the following two code lines ?|
1. new OuterClass().new InnerClass();
2. new OuterClass.InnerClass();
|What are the Wrapper classes available for primitive types ?|
|What are wrapper classes ?|
|Why Struts 1 Classes are not Thread Safe whereas Struts 2 classes are thread safe ?|
|What is a stream and what are the types of Streams and classes of the Streams?|