Interview Questions

[interques-blog]

Synchronization on Objects

Why does java support synchronization on the Object Class? How is it different from a synchronized method?

[interques-blog]

Java Stack as a List

Why is a java Stack class inherit from a List? What are the pros and cons? Is the inheritance approach correct in this case? What are other possible approaches? 

[interques-blog]

How is the Java set implemented internally?

It is implemented as a Map of values.

[interques-blog]

Java Hashcode and Equals

What is the significance of hashcode and equals methods? When should one override them?

[interques-blog]

Java overloaded methods with Generics

Is the following class compile and run successfully in Java 7? What are the changes you will suggest to make it work.

public class Test {

private long sum(List<Integer> numbers) {

   //calculates the sum of integers here

   return answer;

}

private long sum(List<Long> numbers) {

   //calculates the sum of longs here

   return answer;

}

}