Have a singleton - Real's Java How-to

Have a singletonTag(s): Language

A singleton is a class that can be instantiated only one time in a JVM. Repeated calls always return the same instance.

public class OnlyOne{
    private static OnlyOne one = new OnlyOne();

    private OnlyOne(){}

    public static OnlyOne getInstance() { return one; }
}

To use it

OnlyOne myOne = OnlyOne.getInstance();