java 获取昨天今天和明天

public class DateUtils {
	public static Date getBeforeDay(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.add(Calendar.DAY_OF_MONTH, -1);
		date = calendar.getTime();
		return date;
	}
	public static Date getToday(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.add(Calendar.DAY_OF_MONTH, 0);
		date = calendar.getTime();
		return date;
	}
	public static Date getNextDay(Date date) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		calendar.add(Calendar.DAY_OF_MONTH, -1);
		date = calendar.getTime();
		return date;
	}
}