Java - What is singleton class & it's implementation.

GeekInterview.com > Tech FAQs > Programming > Java

Go To First | Previous Question | Next Question

Java | Question 7 of 928

What is singleton class & it's implementation.

Total Answers and Comments: 5

Last Update: September 27, 2006

Sponsored Links

Best Rated Answer

—

Submitted by: Vinoth Senthill

With the Singleton design pattern you can:
Ensure that only one instance of a class is created
Provide a global point of access to the object
Allow multiple instances in the future without affecting a singleton class's clients

//Sample Code
public class SingleInstance {
private static SingleInstance ourInstance = new SingleInstance();

public static SingleInstance getInstance() {
if(null==ourInstance){
ourInstance= new SingleInstance();
}
return ourInstance;
}
private SingleInstance() {
}
}

Above answer was rated as good by the following members:
shilpad, shyjuck

July 01, 2005 05:20:33

Vinoth Senthill

RE: What is singleton class & it's implementation.

With the Singleton design pattern you can:
Ensure that only one instance of a class is created
Provide a global point of access to the object
Allow multiple instances in the future without affecting a singleton class's clients

//Sample Code
public class SingleInstance {
private static SingleInstance ourInstance new SingleInstance();

public static SingleInstance getInstance() {
if(null ourInstance){
ourInstance new SingleInstance();
}
return ourInstance;
}
private SingleInstance() {
}
}

Is this answer useful? Yes | No

2 0

Overall Rating: +2

September 08, 2005 00:40:41

Rose

RE: What is singleton class & it's implementation.

Nice explanation.... usage of singleton classes can also be included..

Is this answer useful? Yes | No

October 18, 2005 06:59:33

Hemanth Kumar Venugobal

RE: What is singleton class & it's implementation...

good

Is this answer useful? Yes | No

September 12, 2006 07:47:52

artika

then why class

when only one instance of a class can be made

then wat's the purpose of makin it as a class

Is this answer useful? Yes | No

September 27, 2006 04:35:32

chandrakanth

RE: What is singleton class & it's implementation...

In singleton class only one time the instance wil create.Example....

public class Sin
{
static Sin s null;
public static void main(String a[])
{
create();
create();
create();
}
public static Sin create()
{
if(s null)
{
s new Sin();
}
else
{
System.out.println( Please it is a single ton class );
}
return s;
}
private Sin()
{
System.out.println( Single ton class );
}
}

Is this answer useful? Yes | No

Go To Top

User Name		Remember Me?
Password

Question Bank