在MIDlet小程序里面显示时间

import javax.microedition.lcdui.*;import java.util.*;import javax.microedition.midlet.MIDlet;public class DateFieldItemStateListenerDemo extends MIDlet implements CommandListener{private final static Command CMD_EXIT = new Command("Exit", Command.EXIT, 1);private DateField mDateField;private Form. mainForm;private StringItem stringItem;public DateFieldItemStateListenerDemo() {mainForm. = new Form("DateField演示");} protected void startApp() {mDateField = new DateField("Date", DateField.DATE_TIME);mDateField.setDate(new Date());mainForm.append(mDateField);stringItem = new StringItem("ItemStateListener:"," ");mainForm.append(stringItem);mainForm.addCommand(CMD_EXIT);mainForm.setCommandListener(this); Display.getDisplay(this).setCurrent(mainForm);ItemStateListener listener = new ItemStateListener(){public void itemStateChanged(Item item){if(item == mDateField){Calendar calendar = Calendar.getInstance(TimeZone.getDefault());calendar.setTime(mDateField.getDate());Date today = calendar.getTime();String timeString = calendar.get(Calendar.YEAR)+"年"+getMonth(calendar)+calendar.get(Calendar.DATE)+"日"+getWeek(calendar)+calendar.get(Calendar.HOUR_OF_DAY)+"时"+getAM_PM(calendar)+calendar.get(Calendar.HOUR)+"时"+calendar.get(Calendar.MINUTE)+"分"+calendar.get(Calendar.SECOND)+"秒"+calendar.get(Calendar.MILLISECOND)+"毫秒";stringItem.setText(timeString); }} };mainForm.setItemStateListener(listener);} private String getMonth(Calendar c){switch(c.get(Calendar.MONTH)){case Calendar.JANUARY:return"一月";case Calendar.FEBRUARY:return"二月";case Calendar.MARCH:return"三月";case Calendar.APRIL:return"四月";case Calendar.MAY:return"五月";case Calendar.JUNE:return"六月";case Calendar.JULY:return"七月";case Calendar.AUGUST:return"八月";case Calendar.SEPTEMBER:return"九月";case Calendar.OCTOBER:return"十月";case Calendar.NOVEMBER:return"十一月";case Calendar.DECEMBER:return"十二月";}return null;} private String getWeek(Calendar c){switch(c.get(Calendar.DAY_OF_WEEK)){case Calendar.SUNDAY:return"星期日";case Calendar.MONDAY:return"星期一";case Calendar.TUESDAY:return"星期二";case Calendar.WEDNESDAY:return"星期三";case Calendar.THURSDAY:return"星期四";case Calendar.FRIDAY:return"星期五";case Calendar.SATURDAY:return"星期六";};return null;} private String getAM_PM(Calendar c){switch(c.get(Calendar.AM_PM)){case Calendar.AM:return"上午";case Calendar.PM:return"下午";};return null;}protected void destroyApp(boolean unconditional) {} protected void pauseApp() {} public void commandAction(Command c, Displayable d) {if (c == CMD_EXIT) {destroyApp(false);notifyDestroyed();}} }

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