Answer Posted / marshallsudhan

singleton class - has single Instance.

The Singleton is a useful Design Pattern for allowing only
one instance of your class, but common mistakes can
inadvertently allow more than one instance to be created.

The Singleton's purpose is to control object creation,
limiting the number to one but allowing the flexibility to
create more objects if the situation changes. Since there
is only one Singleton instance, any instance fields of a
Singleton will occur only once per class, just like static
fields.

//Eg Pgm.

class Sample
{
void m1()
{
System.out.println("Method m1");
}
void m2()
{
System.out.println("Method m2");
}
private Sample()
{
System.out.println("Constructor");
}
public static void main(String[] args)
{
Sample s = new Sample();
s.m1();
s.m2();
}

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