import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class Main {
private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
public static void main(String args[]) {
Date d = new Date();
// 月初
System.out.println("月初" + sdf.format(getMonthStart(d)));
// 月末
System.out.println("月末" + sdf.format(getMonthEnd(d)));
Date date = getMonthStart(d);
Date monthEnd = getMonthEnd(d);
while (!date.after(monthEnd)) {
System.out.println(sdf.format(date));
date = getNext(date);
}
}
private static Date getMonthStart(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int index = calendar.get(Calendar.DAY_OF_MONTH);
calendar.add(Calendar.DATE, (1 - index));
return calendar.getTime();
}
private static Date getMonthEnd(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.MONTH, 1);
int index = calendar.get(Calendar.DAY_OF_MONTH);
calendar.add(Calendar.DATE, (-index));
return calendar.getTime();
}
private static Date getNext(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DATE, 1);
return calendar.getTime();
}
}
这是一个月的 你改改就能写出上个月的了吧
追问这个只是获取当月的日期 ，我要的是 根据日期获取上月、和本月的所有日期
追答把getMonthStart 修改为
private static Date getMonthStart(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.MONTH, -1);
int index = calendar.get(Calendar.DAY_OF_MONTH);
calendar.add(Calendar.DATE, (1 - index));
return calendar.getTime();
}
追问加q可以么 121686578