java获取昨天今天明天的日期

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);
    }

}