对RMS中的数据进行排序 |
| 作者：未知 来源：j2medev 发布时间：2006-7-25 8:53:14 |
|
import javax.microedition.rms.*; import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import java.io.*; public class SortExample extends MIDlet implements CommandListener { private Display display; private Alert alert; private Form form; private Command exit; private Command start; private RecordStore recordstore = null; private RecordEnumeration recordEnumeration = null; private Comparator comparator = null; public SortExample () { display = Display.getDisplay(this); exit = new Command("Exit", Command.SCREEN, 1); start = new Command("Start", Command.SCREEN, 1); form = new Form("Mixed RecordEnumeration", null); form.addCommand(exit); form.addCommand(start); form.setCommandListener(this); } public void startApp() { display.setCurrent(form); } public void pauseApp() { } public void destroyApp( boolean unconditional ) { } public void commandAction(Command command, Displayable displayable) { if (command == exit) { destroyApp(true); notifyDestroyed(); } else if (command == start) { try { recordstore = RecordStore.openRecordStore( "myRecordStore", true ); } catch (Exception error) { alert = new Alert("Error Creating", error.toString(), null, AlertType.WARNING); alert.setTimeout(Alert.FOREVER); display.setCurrent(alert); } try { String outputData[] = {"Mary", "Bob", "Adam"}; for (int x = 0; x < 3; x++) { byte[] byteOutputData = outputData[x].getBytes(); recordstore.addRecord(byteOutputData, 0, byteOutputData.length); } } catch ( Exception error) { alert = new Alert("Error Writing", error.toString(), null, AlertType.WARNING); alert.setTimeout(Alert.FOREVER); display.setCurrent(alert); } try { StringBuffer buffer = new StringBuffer(); Comparator comparator = new Comparator(); recordEnumeration = recordstore.enumerateRecords( null, comparator, false); while (recordEnumeration.hasNextElement()) { buffer.append(new String(recordEnumeration.nextRecord())); buffer.append("\n"); } alert = new Alert("Reading", buffer.toString() , null, AlertType.WARNING); alert.setTimeout(Alert.FOREVER); display.setCurrent(alert); } catch (Exception error) { alert = new Alert("Error Reading", error.toString(), null, AlertType.WARNING); alert.setTimeout(Alert.FOREVER); display.setCurrent(alert); } try { recordstore.closeRecordStore(); } catch (Exception error) { alert = new Alert("Error Closing", error.toString(), null, AlertType.WARNING); alert.setTimeout(Alert.FOREVER); display.setCurrent(alert); } if (RecordStore.listRecordStores() != null) { try { RecordStore.deleteRecordStore("myRecordStore"); recordEnumeration.destroy(); } catch (Exception error) { alert = new Alert("Error Removing", error.toString(), null, AlertType.WARNING); alert.setTimeout(Alert.FOREVER); display.setCurrent(alert); } } } } } class Comparator implements RecordComparator { public int compare(byte[] record1, byte[] record2) { String string1 = new String(record1), string2= new String(record2); int comparison = string1.compareTo(string2); if (comparison == 0) return RecordComparator.EQUIVALENT; else if (comparison < 0) return RecordComparator.PRECEDES; else return RecordComparator.FOLLOWS; } } |
| [] [返回上一页] [打 印] |
|
文章评论 |
| WAP资讯 | 3G动态 | SP动态 | 运营商动态 | 内容商动态 | 制造商动态 | 论坛讨论>> | 每次自动访问 |
| WAP技术 | WAP源码 | 手机编程 | 手机源码 | 无线技术 | J2ME技术 | 手机软件 | 添加到收藏夹 |
| IVR技术 | SP资料 | SMS MMS技术 | 商业方案 | IVR下载 | 书籍教程 | 工具软件 | 语言：繁體中文 |