public class DateEx extends Jlet implements ActionListener
↑부분 에러남.

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//예제5-3
import org.kwis.msp.lcdui.*;
import org.kwis.msp.lwc.*;

public class DateEx extends Jlet implements ActionListener
{
 ShellComponent shell = new ShellComponent();
 FormComponent form = new FormComponent();
 ButtonComponent button = new ButtonComponent("모드바꾸기",null);

 DateFieldComponent date = new DateFieldComponent(DateFieldComponent.MODE_DATE);

 protected void startApp(String args[])
 {
  
        form.addComponent(date);
        form.addComponent(button);
        form.setGab(10);
  shell.addComponent(form);
  shell.show();
 }
 protected void paseApp(){}
 protected void resumeApp(){}
 protected void destroyApp(boolean b){}

 public void action(Command c, Object o)
 {
  
  switch (date.getMode())
  {
  case DateFieldComponent.MODE_DATE :
   date.setMode(DateFieldComponent.MODE_TIME_DATE);
      break;
  case DateFieldComponent.MODE_TIME_DATE :
   date.setMode(DateFieldComponent.MODE_TIME);
      break;
  case DateFieldComponent.MODE_TIME :
   date.setMode(DateFieldComponent.MODE_DATE);
      break;
  
  }

 }
}