Tuesday, 13 August 2013

Singleton Implementation Java Code

Singleton.java

public class Singleton
{
// Static member holds only one instance of the Singleton class
private static Singleton singletonInstance;

// SingletonExample prevents any other class from instantiating
private Singleton()
{

}

// Providing Global point of access
public static Singleton getSingletonInstance()
{
if( null == singletonInstance )
{
singletonInstance = new Singleton();
System.out.println("Inside null check , Object is Created : "                
                                                                                +singletonInstance.toString());
         System.out.println(" -------------------------------------------------- ");
}
return singletonInstance;
}

public void printSingleton()
{
System.out.println("Inside print Singleton object : " +singletonInstance.toString());
System.out.println("");
}

}

SingletonPatternDemo.java

public class SingletonPatternDemo
{
public static void main( String[] args )
{
Singleton.getSingletonInstance().printSingleton();
Singleton.getSingletonInstance().printSingleton();
Singleton.getSingletonInstance().printSingleton();
}

}


Output

Inside null check , Object is Created : Singleton@addbf1
 -----------------------------------------------------
Inside print Singleton object : Singleton@addbf1
Inside print Singleton object : Singleton@addbf1
Inside print Singleton object : Singleton@addbf1

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