Java中日历类Calendar的使用

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Java中日历类Calendar的使用：import java.util.Calendar;  import java.util.GregorianCalendar;    public class calendarTest {      public static void main(String[] args) {          Calendar calendar=Calendar.getInstance();          System.out.println(                  "现在是："+                  calendar.get(GregorianCalendar.YEAR) + "年" +                  (calendar.get(GregorianCalendar.MONTH)+1) + "月" +                  calendar.get(GregorianCalendar.DAY_OF_MONTH) + "日" +                  calendar.get(GregorianCalendar.HOUR) + "时" +                  calendar.get(GregorianCalendar.MINUTE)+ "分" +                  calendar.get(GregorianCalendar.SECOND)+ "秒");        // ---Calendar calendar1 = Calendar.getInstance();Date now = calendar1.getTime();calendar1.add(Calendar.DATE,-1);Date yesterday =calendar1.getTime();Calendar calendar2 = Calendar.getInstance();calendar2.add(Calendar.DATE, 1);Date tomorrow = calendar2.getTime();System.out.println(yesterday);System.out.println(now);System.out.println(tomorrow);// calendar.add(int field, int amount)方法：// -->field 可以是年、月、日、时、分、秒 等等// -->amount 表示要增加的数量，负数表示减少    }  }

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