Subject: Singleton Pattern
Author: Alex_Raj
Posted on: 12/05/2013 07:20:23 PM
As its name suggests, singleton is a class that is instantiated only once across your application environment. This is typically accomplished by creating a static field in the class representing the class.
Two key points of a single design pattern:
only one instance allowed for a classglobal point of access to that single instanceHere is an example (not right though):
public class Singleton
{
/* static field to ensure only one copy */
private static Singleton instance;
/* private constructor to prevent it from being instantiated from outside */
private Singleton() {
}
/* public static method to ensure global point of access */
public static Singleton getInstance()
{
if(instance==null){
instance = new Singleton();
}
return instance;
}
public void sayHello() {
System.out.println("Hello");
}
}
Replies:
References:
