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