j2me学习笔记【6】——获取日期时间

获取系统的日期和时间，两种方法，一种利用DateField，另一种利用Calendar.

package mtk; import java.util.Calendar; import java.util.Date; import javax.microedition.lcdui.Command; import javax.microedition.lcdui.CommandListener; import javax.microedition.lcdui.DateField; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.midlet.MIDlet; import javax.microedition.midlet.MIDletStateChangeException; public class DataToday extends MIDlet implements CommandListener { private Display display; private Form mainForm; private final static Command CMD_EXIT=new Command("退出",Command.EXIT,1); public DataToday() { display=Display.getDisplay(this); mainForm=new Form("显示日期时间"); Calendar c = Calendar.getInstance(); c.setTime(new Date()); int year = c.get(Calendar.YEAR); int month = c.get(Calendar.MONTH)+1; int date = c.get(Calendar.DATE); String hour=String.valueOf(c.get(Calendar.HOUR)); String minute=String.valueOf(c.get(Calendar.MINUTE)); String second=String.valueOf(c.get(Calendar.SECOND)); Date datetime=c.getTime(); mainForm.append(year+"-"+month+"-"+date+" "+hour+":"+minute+":"+second); DateField time=new DateField("",DateField.DATE_TIME); time.setDate(datetime); mainForm.append(time); mainForm.addCommand(CMD_EXIT); mainForm.setCommandListener(this); } protected void destroyApp(boolean arg0) { } protected void pauseApp() { } protected void startApp() throws MIDletStateChangeException { display.setCurrent(mainForm); } public void commandAction(Command c, Displayable d) { if(c==CMD_EXIT){ destroyApp(false); notifyDestroyed(); } } }