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();}}}