@SuppressWarnings("unused")
	private static void checkTime() {
		long pre = System.nanoTime();

		// 計測対象の処理
		for (int i = 0; i < 100; i++) {
			System.out.println("hello");
		}
		
		long post = System.nanoTime();
		NumberFormat nf = NumberFormat.getNumberInstance();
		System.out.println("[" +  nf.format((post - pre)/1000) + "] μ sec" );
	}