import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

public class cc {
	public static void main(String[] args) {
		List<String> Yeardates=new ArrayList();
		//循环输出2014到2020年每一天
		for (int year = 2014; year < 2021; year++) {
			Yeardates.addAll(cc.getDaysByYear(year));
		}
		for (int i = 0; i < Yeardates.size(); i++) {
			System.out.println(Yeardates.get(i));
		}
	}
	
	public static List<String> getDaysByYear(int year){
		Calendar c=Calendar.getInstance();
		List<String> dates=new ArrayList<String>();
		for(int i=0;i<12;i++){
			c.set(year,i,1);
			int lastDay=c.getActualMaximum(Calendar.DATE);
			for(int j=1;j<=lastDay;j++){	
				String month="";
				String day="";
				if(i<9) month="-0"+(i+1);
				else month="-"+(i+1);
				if(j<10) day="-0"+j;
				else day="-"+j;
				String date=year+month+day;
				System.out.println(date);
				dates.add(date);
			}
		}
		return dates;
	}
}

效果如下：