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  • java获取昨天今天明天的日期

     我刚写完这个代码,就被开除了........

     代码双手奉上以备后用:

    package mydemo;
    
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    import java.util.GregorianCalendar;
    
    public class ThreeDay {
        public static void main(String[] args) {
            getToday();
            getYesterday();
            getTomorrow();
        }
    
        /**
         * 获取今天的日期
         */
        public static void getToday() {
            //SimpleDateFormat smdate = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
            SimpleDateFormat smdate = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
            String date = smdate.format(new Date());
            System.out.println(date);
        }
    
        /**
         * 获取昨天的日期
         */
        public static void getYesterday() {
            SimpleDateFormat smdate = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
            Calendar calendar = new GregorianCalendar();
            calendar.setTime(new Date());
            calendar.add(calendar.DATE, -1);
            String date = smdate.format(calendar.getTime());
            System.out.println(date);
        }
    
        /**
         * 获取明天的日期
         */
        public static void getTomorrow() {
            SimpleDateFormat smdate = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
            Calendar calendar = new GregorianCalendar();
            calendar.setTime(new Date());
            calendar.add(calendar.DATE, 1);
            String date = smdate.format(calendar.getTime());
            System.out.println(date);
        }
    
    }

    结果:

    补充:

            Calendar calendar = Calendar.getInstance();
            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH)+1;
            int day = calendar.get(Calendar.DATE);
            System.out.println(year);
            System.out.println(month);
            System.out.println(day);
    package util;
    
    import java.text.DateFormat;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Calendar;
    import java.util.Collections;
    import java.util.Date;
    import java.util.List;
    
    public class Time {
    
        /**
         * 获取指定月份
         * 
         * @param months
         * @return
         */
        public static List<String> getMonthsBetween(int months) {
            List<String> listMonth = new ArrayList<>();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            Calendar c = Calendar.getInstance();
            for (int i = 1; i <= months; i++) {
                c.setTime(new Date());
                c.add(Calendar.MONTH, -i);
                Date m = c.getTime();
                listMonth.add(sdf.format(m));
            }
            Collections.reverse(listMonth);
            return listMonth;
        }
    
        /**
         * 获取前几天的日期
         * 
         * @param days
         * @return
         */
        public static List<String> getDaysBetwwen(int days) {
            Calendar calendar = Calendar.getInstance();
            List<String> listDays = new ArrayList<>();
            // 1天
            Long oneDay = 1000 * 60 * 60 * 24l;
            for (int i = 0; i < days; i++) {
                Date d = new Date(calendar.getTimeInMillis() - oneDay * i);
                DateFormat df = new SimpleDateFormat("MM月dd日");
                // System.out.println(df.format(d));
                listDays.add(df.format(d));
            }
            Collections.reverse(listDays); // 倒序排列
            return listDays;
        }
    
        public static String getLast12Months(int i) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            Calendar c = Calendar.getInstance();
            c.setTime(new Date());
            c.add(Calendar.MONTH, -i);
            Date m = c.getTime();
            return sdf.format(m);
        }
    
        public static void main(String[] args) {
            List<String> daysBetwwen = getDaysBetwwen(7);
            System.out.println(daysBetwwen.toString());
            List<String> monthsBetween = getMonthsBetween(7);
            // Collections.sort(monthsBetween); // 顺序排列
            // Collections.shuffle(monthsBetween); // 混乱的意思
            // Collections.binarySearch(monthsBetween, " a5 ");
            // Collections.reverse(monthsBetween);// 倒序排列
            System.out.println(monthsBetween.toString());
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/xiejn/p/12037954.html
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