package test.remote.tools.combine;    import java.text.SimpleDateFormat;  import java.util.Calendar;  import java.util.Date;  import java.util.GregorianCalendar;    public class TestOutDate   {      public static void main(String[] args)      {          //method 1          Calendar nowtime = new GregorianCalendar();          String strDateTime="["+String.format("%04d", nowtime.get(Calendar.YEAR))+"/"+                  String.format("%02d", nowtime.get(Calendar.MONTH))+"/" +                  String.format("%02d", nowtime.get(Calendar.DATE))+" " +                  String.format("%02d", nowtime.get(Calendar.HOUR))+":" +                  String.format("%02d", nowtime.get(Calendar.MINUTE))+":" +                  String.format("%02d", nowtime.get(Calendar.SECOND))+"." +                  String.format("%03d", nowtime.get(Calendar.MILLISECOND))+"]";          System.out.println(strDateTime);                    //method 2          String msg="";          Date date = new Date();          SimpleDateFormat sdf = new SimpleDateFormat("YYYY/MM/dd HH:mm:ss.SSS");          msg+="["+sdf.format(date)+"]";                    System.out.println(msg);      }  }

 运行结果：

[2018/04/25 02:51:33.379]

[2018/05/25 14:51:33.393]