package singleton.pub2;
public interface S {
	public static final S instance = SFactory.newS();
	public int inc();
}
class SFactory {
	static S newS() {
		if ("linux".equals(System.getProperty("os.name")))
			return new SLinux();
		else
			return new SOther();
	}
}
final class SLinux implements S {
	private int i;
	public int inc() {return ++i;}
}
final class SOther implements S {
	private int i;
	public int inc() {return --i;}
}