Java将时间戳转换为星期几

如何将时间戳转换为星期几

public String getWeekOfDate(Timestamp timestamp) {
	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(timestamp);
	int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
	if (w < 0)
		w = 0;
	return weekDays[w];
}

//Calendar 类非常强大 可以将时间戳转换为时间类