Java:programmer's Boon

DIFFERENCE BETWEEN HASHMAP AND HASHTABLE PLEASE COMMENT

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Collections.sort() uses merge sort and arrays.sort() uses quick sort...
For primitive type quick sort is efficient...and for non primitives merge sort is more efficient .
why a different sort algorithm is used for primitive arrays than for Object arrays?

Why String class is Immutable ? Give some strong reasons behind this with examples.

Since the introduction of Functional programming in Java 8 , it has brought new concepts and flexibility for the language.

So what is functional programming?
How it is different from object oriented programming ?
When do we need functional programming ?

Let's have some discussion on this. Please post your answers in the comments section.

Hi Friends . Please go through the life cycle of an object in HIBERNATE .

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How does the HashMap works?
One of the Darling questions for interviews in Java.
http://www.java2blog.com/2014/02/how-hashmap-works-in-java.html

How HashMap works in java - Java tutorial for beginners Java HashMap: This tutorial provides how HashMap works in java.It also explains get and put method in java

SPRING ARCHITECTURE

Does The following Code Compile
Giver Appropriate reason to suppor your answer..

class SampleCode
{
public static void main(String args[])
{
try{
System.out.println("SomeCode in try");
}
System.out.println("Some code in between");
catch(Exception exc)
{
exc.getMessage();
exc.printStackTrace();
}
}
}

The Singleton pattern, if used correctly is very helpful in designing complex systems.