Date，Calendar，SimpleDateFormat的使用

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package datetest;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class Test {    public static void main(String[] args) {        Date date = new Date();        System.out.println(date);        System.out.println(date.getTime());        //表示 1970 年 1 月 1 日 00:00:00 GMT 以后 time 毫秒的时间点        Calendar rightNow = Calendar.getInstance();        System.out.print(rightNow.get(Calendar.YEAR)+"年");        System.out.print((rightNow.get(Calendar.MONTH)+1)+"月");        System.out.println(rightNow.get(Calendar.DAY_OF_MONTH)+"日");        rightNow.set(Calendar.DAY_OF_YEAR,rightNow.get(Calendar.DAY_OF_YEAR)+20);        System.out.print(rightNow.get(Calendar.YEAR)+"年");        System.out.print((rightNow.get(Calendar.MONTH)+1)+"月");        System.out.println(rightNow.get(Calendar.DAY_OF_MONTH)+"日");        Date data2 = rightNow.getTime();//Calendar转化为Date        SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日    HH:mm:ss");        //时间转化为字符串        String time = format.format(rightNow.getTime());        System.out.println(time);        //字符串转化为时间        try {            Date date3 = format.parse(time);            System.out.println(date3.getTime());        } catch (ParseException e) {            e.printStackTrace();        }    }}
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