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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();