Test.java

class Test {
	public static void main(String[] args) {
		Single.instance.hoge();
		// Single s = new Single();
		Single s = Single.instance;
		s.hoge();
	}
}

class Single {
	public final static Single instance = new Single();
	private Single() {}
	public void hoge() { System.out.println("hoge"); }
}