java获取上个月_Java自学日期Calendar

package date;//
import java.util.Calendar;
import java.util.Date;public class TestDate {public static void main(String[] args) {//采用单例模式获取日历对象Calendar.getInstance();Calendar c &＃61; Calendar.getInstance();//通过日历对象得到日期对象Date d &＃61; c.getTime();Date d2 &＃61; new Date(0);c.setTime(d2); //把这个日历&＃xff0c;调成日期 : 1970.1.1 08:00:00}
}

package date;import java.text.SimpleDateFormat;
//
import java.util.Calendar;
import java.util.Date;public class TestDate {private static SimpleDateFormat sdf &＃61; new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");public static void main(String[] args) {Calendar c &＃61; Calendar.getInstance();Date now &＃61; c.getTime();// 当前日期System.out.println("当前日期&＃xff1a;t" &＃43; format(c.getTime()));// 下个月的今天c.setTime(now);c.add(Calendar.MONTH, 1);System.out.println("下个月的今天:t" &＃43;format(c.getTime()));// 去年的今天c.setTime(now);c.add(Calendar.YEAR, -1);System.out.println("去年的今天:t" &＃43;format(c.getTime()));// 上个月的第三天c.setTime(now);c.add(Calendar.MONTH, -1);c.set(Calendar.DATE, 3);System.out.println("上个月的第三天:t" &＃43;format(c.getTime()));}private static String format(Date time) {return sdf.format(time);}
}

package date;import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;public class TestDate {private static SimpleDateFormat sdf &＃61; new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");public static void main(String[] args) {Calendar c &＃61; Calendar.getInstance();System.out.println("今天是:" &＃43; format( c.getTime()));//先翻到下下个月c.add(Calendar.MONTH,2);//设置到月初c.set(Calendar.DATE,1);//再往回翻3天c.add(Calendar.DATE,-3);Exception e;System.out.println("下个月倒数第三天是:" &＃43; format(c.getTime()));}private static String format(Date time) {return sdf.format(time);}
}