JAVA取星期几

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class Test {
	public static void main(String[] args) {

		final String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五",
				"星期六" };

		String s = "2014-01-31";
		SimpleDateFormat sdfInput = new SimpleDateFormat("yyyy-MM-dd");

		Calendar calendar = Calendar.getInstance();
		Date date = new Date();

		try {
			date = sdfInput.parse(s);
		} catch (ParseException e) {
			e.printStackTrace();
		}

		calendar.setTime(date);
		int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1;
		if (dayOfWeek < 0)
			dayOfWeek = 0;
		System.out.println(dayNames[dayOfWeek]);
	}
}