转载的一篇关于时间的java程序

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import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Calendar;
import java.util.Locale;

public class DisplayDate {
    public static void main(String arg[]){
        Date today;
        Calendar now;
        DateFormat f1;
        String s1;

        System.out.println("/n显示Date类的相关用法");

        today = new Date();//显示当前时间；
        //输出为：new Date() = Sun Dec 28 16:17:46 CST 2008
        System.out.println("new Date() = /t" + today);
        s1 = today.toLocaleString();
        //输出：today.toLocaleString()= 2008-12-28 16:33:03
        System.out.println("today.toLocaleString() = " + s1);
        s1 = today.toGMTString();
        //输出：today.toGMTString() = 28 Dec 2008 08:33:58 GMT
        System.out.println("today.toGMTString() = " + s1);
        //输出：today.getTime() = 1230453366781;
        System.out.println("today.getTime() = " + today.getTime());
        //输出：System.currentTimeMillis() = 1230453366781; 1970年1月1日开始到当前所经历的毫秒数
        System.out.println("System.currentTimeMillis() = " + System.currentTimeMillis());


        System.out.println("用DateFormat显示各种时间格式：");

        f1 = DateFormat.getDateInstance();
        s1 = f1.format(today);
        //输出为：DateFormat.getDateInstance() = 2008-12-28
        System.out.println("DateFormat.getDateInstance() = " + s1);

        f1 = DateFormat.getInstance();
        s1 = f1.format(today);
        //输出为： DateFormat.getInstance() = 08-12-28 下午4:17
        System.out.println("DateFormat.getInstance() = " + s1);


        f1 = DateFormat.getDateInstance(DateFormat.LONG,Locale.CHINA);
        s1 = f1.format(today);
        //输出为：DateFormat.getDateInstance(DateFormat.LONG,Locale.CHINA) = 2008年12月28日
        System.out.println("DateFormat.getDateInstance(DateFormat.LONG,Locale.CHINA) = " + s1);

        f1 = DateFormat.getDateInstance(DateFormat.MEDIUM,Locale.CHINA);
        s1 = f1.format(today);
        //输出为：DateFormat.getDateInstance(DateFormat.LONG,Locale.CHINA) = 2008-12-28
        System.out.println("DateFormat.getDateInstance(DateFormat.MEDIUM,Locale.CHINA) = " + s1);

        f1 = DateFormat.getDateInstance(DateFormat.SHORT,Locale.CHINA);
        s1 = f1.format(today);
        //输出为：DateFormat.getDateInstance(DateFormat.LONG,Locale.CHINA) = 08-12-28
        System.out.println("DateFormat.getDateInstance(DateFormat.SHORT,Locale.CHINA) = " + s1);



        System.out.println("/n用DateFormat类显示各种时间格式");

        f1 = DateFormat.getTimeInstance();
        s1 = f1.format(today);
        //输出为：DateFormat.getTimeInstance() = 16:24:19
        System.out.println("DateFormat.getTimeInstance() = " + s1);

        f1 = DateFormat.getTimeInstance(DateFormat.LONG,Locale.CHINA);
        s1 = f1.format(today);
        //输出为：DateFormat.getTimeInstance(DateFormat.LONG,Locale.CHINA) = 16:26:54
        System.out.println("DateFormat.getTimeInstance(DateFormat.LONG,Locale.CHINA) = " + s1);

        f1 = DateFormat.getTimeInstance(DateFormat.MEDIUM,Locale.CHINA);
        s1 = f1.format(today);
        //输出为：DateFormat.getTimeInstance(DateFormat.MEDIUM,Locale.CHINA) = 16:26:54
        System.out.println("DateFormat.getTimeInstance(DateFormat.MEDIUM,Locale.CHINA) = " + s1);

        f1 = DateFormat.getTimeInstance(DateFormat.SHORT,Locale.CHINA);
        s1 = f1.format(today);
        //输出为：DateFormat.getTimeInstance(DateFormat.SHORT,Locale.CHINA) = 下午4:25
        System.out.println("DateFormat.getTimeInstance(DateFormat.SHORT,Locale.CHINA) = " + s1);

        SimpleDateFormat defaultSDF = new SimpleDateFormat();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
        //输出：defaultSDF.format(today) = 08-12-28 下午4:43
        System.out.println("defaultSDF.format(today) = " + defaultSDF.format(today));

        //输出：sdf.format(today) = 2008-45-28
        System.out.println("sdf.format(today) = " + sdf.format(today));


        s1 = "2008-12-28";
        try{
            //输出：sdf.parse(s1) = Mon Jan 28 00:12:00 CST 2008
            System.out.println("sdf.parse(s1) = " + sdf.parse(s1));
        }catch(Exception e){
            System.out.println(e);
        }

        System.out.println("/n显示Calendar的相关时间用法");

        now = Calendar.getInstance();
        today = now.getTime();
        //去掉toString()效果一样
        System.out.println("Calendar.getInstance().getTime() = " + today.toString());

    }



}