addsomedays.java

JAVA实现的酒店管理系统

package file1;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.StringTokenizer;

public class AddSomeDays {
	public AddSomeDays(){
		
	}
	public 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;
		}
	}
}