Singleton : Approach1

Approach1

class Approach1
{
    private static Approach1 a1 = new Approach1();
    private Approach1()
    {    }
    public static Approach1 getA1()
    {  return a1;  }
}
public class Tests {

    public static void main(String[] args)
    {
            Approach1 a1 = Approach1.getA1();
            Approach1 a2 = Approach1.getA1();
            Approach1 a1000 = Approach1.getA1();
    }
}