Java语言的电子电话簿

/* * 添加新记录 */ package PhoneBook; import javax.microedition.lcdui.*; import javax.microedition.midlet.*; import javax.microedition.rms.*; public class NewRecordForm extends Form implements CommandListener{ private TextField nameField; private TextField mobileField; private TextField phoneField; private TextField emailField; private Displayable dis; private MIDlet mid; private RecordStore rs = null; private static final Command saveCommand = new Command("保存", Command.OK, 2); private static final Command backCommand = new Command("返回", Command.BACK, 3); public NewRecordForm(String title,Displayable dis,MIDlet mid,RecordStore rs) { super(title); this.dis = dis; this.mid = mid; this.rs = rs; nameField = new TextField(BookConstant.name, null, 25, TextField.ANY); mobileField = new TextField(BookConstant.mobile, null, 25, TextField.PHONENUMBER); phoneField = new TextField(BookConstant.phone, null, 25, TextField.PHONENUMBER); emailField = new TextField(BookConstant.email, null, 25, TextField.EMAILADDR); this.append(nameField); this.append(mobileField); this.append(phoneField); this.append(emailField); this.addCommand(saveCommand); this.addCommand(backCommand); this.setCommandListener(this); } public void commandAction(Command c, Displayable d){ if(c==saveCommand){ if(rs != null){ if(nameField.getString().length() == 0){ Alert a_name = new Alert("提醒", "姓名不能为空，请输入姓名", null, AlertType.ERROR); a_name.setTimeout(Alert.FOREVER); Display.getDisplay(mid).setCurrent(a_name); return; } //查找是否已经存在相同的名字 RecordFilter rf = new FindFilter(nameField.getString()); RecordEnumeration re = null; try { re = rs.enumerateRecords(rf, null, false); // if (re.hasNextElement()) { // re.nextRecord(); // } } catch (Exception e) { } //如果已经存在一个相同的名字则返回 if(re.numRecords()>0){ Alert a_same = new Alert("提醒", "你输入的姓名已经存在,请输入其他名字", null, AlertType.ERROR); a_same.setTimeout(Alert.FOREVER); Display.getDisplay(mid).setCurrent(a_same); re.destroy(); return; } //添加一个新记录 BookAccount account = new BookAccount(nameField.getString(), mobileField.getString(),emailField.getString(), phoneField.getString()); try{ byte[] rec = account.serialize(); rs.addRecord(rec, 0, rec.length); Display.getDisplay(mid).setCurrent(dis); }catch(Exception e){ } } }else if(c == backCommand){ Display.getDisplay(mid).setCurrent(dis); } } }