package singleton.state;
public class S {
	private S() {}
	static private SState state;
	static {
		if ("linux".equals(System.getProperty("os.name"))) {
			state = new SLinux();
		} else {
			state = new SOther();
		}
	}
	static public int inc() { return state.inc(); }

	static private interface SState {
		public int inc();
	}
	static private class SLinux implements SState {
		private int i;
		public int inc() {return ++i;}
	}
	static private class SOther implements SState {
		private int i;
		public int inc() {return --i;}
	}
}