J2ME program for EventHandling
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class EventHandlingMIDlet extends MIDlet implements CommandListener {
private Display display;
private List list;
private TextBox input;
private Command back, main, exit;
private String currentItem;
public EventHandlingMIDlet() {
back = new Command(“Back”, Command.BACK, 0);
main = new Command(“Main”, Command.SCREEN, 1);
exit = new Command(“Exit”, Command.STOP, 2);
}
public void startApp() throws MIDletStateChangeException {
display = Display.getDisplay(this);
list = new List(“Menu Items”, Choice.IMPLICIT);
list.append(“EventItem1”, null);
list.append(“EventItem2”, null);
list.append(“EventItem3”, null);
list.append(“EventItem4”, null);
list.addCommand(exit);
list.setCommandListener(this);
mainItem();
}
public void pauseApp() {
display = null;
list = null;
input = null;
}
public void destroyApp(boolean unconditional) {
notifyDestroyed();
}
void mainItem() {
display.setCurrent(list);
currentItem = “Main”;
}
public void show() {
input = new TextBox(“Enter Text Here: “, “”, 10, TextField.ANY);
input.addCommand(back);
input.setCommandListener(this);
input.setString(“”);
display.setCurrent(input);
}
public void commandAction(Command c, Displayable d) {
String label = c.getLabel();
if (label.equals(“Exit”)) {
destroyApp(true);
} else if (label.equals(“Back”)) {
if(currentItem.equals(“Eventitem1”) || currentItem.equals(“Eventitem2”) ||
currentItem.equals(“Eventitem3”) || currentItem.equals(“Eventitem4”)){
mainItem();
}
} else {
List down = (List)display.getCurrent();
switch(down.getSelectedIndex()) {
case 0: showItem();break;
case 1: showItem2();break;
case 2: showItem3();break;
case 3: showItem4();break;
}
}
}
public void showItem() {
show();
currentItem = “Eventitem1”;
}
public void showItem2() {
show();
currentItem = “Eventitem2”;
}
public void showItem3() {
show();
currentItem = “Eventitem3”;
}
public void showItem4() {
show();
currentItem = “Eventitem4”;
}
}
Output:-
