java 中获取日期后一天和前一天代码

获取日期后一天代码：

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class NextDayExample {

   public static void main(String[] args) {
      // create a date
      Date date = new Date();
      Calendar calendar = Calendar.getInstance();
      calendar.setTime(date);

      // add one day to the date
      calendar.add(Calendar.DAY_OF_YEAR, 1);
      date = calendar.getTime();

      // format the date
      SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
      String nextDay = format.format(date);

      System.out.println("Next day: " + nextDay);
   }
}

获取日期前一天代码：

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class PreviousDayExample {

   public static void main(String[] args) {
      // create a date
      Date date = new Date();
      Calendar calendar = Calendar.getInstance();
      calendar.setTime(date);

      // subtract one day from the date
      calendar.add(Calendar.DAY_OF_YEAR, -1);
      date = calendar.getTime();

      // format the date
      SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
      String previousDay = format.format(date);

      System.out.println("Previous day: " + previousDay);
   }
}