给定一个日期，判断星期几

package com;

import java.util.Calendar;
import java.util.Date;

public class Snippet {
	public static String getWeekOfDate(Date dt) {
		String[] weekDays = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
		Calendar cal = Calendar.getInstance();
		cal.setTime(dt);

		int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
		if (w < 0)
			w = 0;
		return weekDays[w];
	}
	public static void main(String[] args) {
		String date=Snippet.getWeekOfDate(new Date());
		System.out.println(date);
	}

}