IBM Interview Questions and Answers - Part I

1.  What is single inheritance?

    Ans:one class is inherited by only other one class

2.What is multiple inheritance?.

    Ans:One class inheriting more than one class at atime

3. Can java support multiple inheritance?

    Ans:No
4. What is interface?.

    Ans:Interface has only method declarations but no defn


5. What is differenec between abstract class and interface?.

    Ans:In abstract class some methods may contain definition,but in interface every method      should beabstract

6. How to u prove that abstrace class cannot instantiate directly?

    Ans:As they dont have constructor they cant be instantiated


12.what is differenece between string and stringbuffer.

ans:Strings are immutable where as string buffer can be modified