张生工作室

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemCommandListener;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MIDletItemCommmandListener extends MIDlet implements ItemCommandListener,CommandListener {
                                                              
 
 private Form frm=new Form("Item监听器");
 private TextField uid=new TextField("用户名","",20,TextField.ANY);
 private TextField pwd=new TextField("密码","",20,TextField.PASSWORD);
 private Display dis=Display.getDisplay(this);
 private Command Del=new Command("删除",Command.ITEM,1);
 
 public MIDletItemCommmandListener() {
  // TODO Auto-generated constructor stub
 }

 protected void startApp() throws MIDletStateChangeException {
  
  
  
  frm.append(uid);
  uid.addCommand(Del);
  pwd.addCommand(Del);
  pwd.setItemCommandListener(this);
  uid.setItemCommandListener(this);
  frm.append(pwd);
  dis.setCurrent(frm);
  dis.setCurrentItem(pwd);
  

 }
 
 protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
  // TODO Auto-generated method stub

 }

 protected void pauseApp() {
  

 }

 public void commandAction(Command c, Item i) {
  
  if(c==Del)
  {
   TextField tf=(TextField)i;
   
   int p=tf.getCaretPosition();
   if(p>0)
   {
   tf.delete(p-1, 1);
   }
  }
 
  
 }

 public void commandAction(Command c, Displayable d) {
  
  
 }

}