addsomedays.java

JAVA实现的酒店管理系统

package tools;

/*
 * @Author:黄顺武
 * Create Time:2008-2-22
 * Description:在某一给定日期的基础上加上指定的天数后返回结果日期值
 */
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.StringTokenizer;

public class AddSomeDays {

	public AddSomeDays() {

	}

	public static String addDays(String date, int dayNum) {
		try {
			StringTokenizer st = new StringTokenizer(date, "-");
			int year = -1;
			int month = -1;
			int dateOfMonth = -1;
			int count = 0;
			while (st.hasMoreTokens()) {
				switch (count) {
				case 0:
					year = Integer.valueOf(st.nextToken());
					count++;
					break;
				case 1:
					month = Integer.valueOf(st.nextToken());
					count++;
					break;
				case 2:
					dateOfMonth = Integer.valueOf(st.nextToken());
					break;
				default:
					break;
				}
			}
			Calendar c = Calendar.getInstance();
			c.set(year, month - 1, dateOfMonth + dayNum);
			SimpleDateFormat smf = new SimpleDateFormat("yyyy-MM-dd");
			Date dateGet = c.getTime();
			String converted = smf.format(dateGet);
			return converted;
		} catch (Exception e) {
			return null;
		}
	}
}