Cascaded List’s Menu in MIDlet

After fetching the Basics of J2ME programming language,this is my first attempt to create something using List’s,so I tried to cascade the list’s and the modal alert.

PROGRAM-2 : Creating Cascaded List’s menu in midlet.

Description: This program present’s you the showcase of How to cascade the multiple list’s in order to create hierarchial menu along with command buttons.

Instructions to run a file:
The sourcecode file has to saved as .java file in the /src folder of new project created using a software “Sun java wireless Toolkit 2.5.2 for CLDC” and for more details, feel free to ask here via comment’s.

Download Link: Creating_Lists [.txt file]

OUTPUT Snapshots:

Source Code: 

	//the essential package's imported
	import java.io.*;
	import javax.microedition.midlet.*;
	import javax.microedition.lcdui.*;
	public class Travel extends MIDlet implements CommandListener
	{
	private Display d;
	private List mlist,mlist1,mlist2,mlist3,mlist4;
	private Command mExit,mNext,mBack;
	private Alert alert1,alert2,alert3,alert4;
	public Travel()
	{
	d=Display.getDisplay(this);
	mlist=new List("TRAVEL LIST",List.IMPLICIT);
	mlist.append("Aeroplane",null);
	mlist.append("Car",null);
	mlist.append("Train",null);
	mlist.append("Hotel",null);
	String str1[]={"KingFisher","JetGo","Spice","AirIndia"};
	String str2[]={"Indigo","Santro","Skoda","Benz"};
	String str3[]={"Mangla","Rajdhani","Deccan Queen","Sahyadri"};
	String str4[]={"Taj","Grand Hyatt","Derby","President"};
	mlist1=new List("Aeroplane LIST",List.IMPLICIT,str1,null);
	mlist2=new List("Car LIST",List.IMPLICIT,str2,null);
	mlist3=new List("Train LIST",List.IMPLICIT,str3,null);
	mlist4=new List("Hotel LIST",List.IMPLICIT,str4,null);
	mExit=new Command("EXIT",Command.EXIT,0);
	mNext=new Command("NEXT",Command.SCREEN,1);
	mBack=new Command("BACK",Command.BACK,1);
	mlist.addCommand(mExit);
	mlist.addCommand(mNext);
	mlist.setCommandListener(this);
	mlist1.addCommand(mBack);
	mlist1.addCommand(mNext);
	mlist1.setCommandListener(this);
	mlist2.addCommand(mBack);
	mlist2.addCommand(mNext);
	mlist2.setCommandListener(this);
	mlist3.addCommand(mBack);
	mlist3.addCommand(mNext);
	mlist3.setCommandListener(this);
	mlist4.addCommand(mBack);
	mlist4.addCommand(mNext);
	mlist4.setCommandListener(this);
	}
	public void startApp()
	{
	d.setCurrent(mlist);
	}
	public void pauseApp()
	{
	}
	public void destroyApp(boolean b)
	{
	}
	public void commandAction(Command c,Displayable s)
	{
	if(c==mExit)
	{
	notifyDestroyed();
	}
	if (c==mNext || c==List.SELECT_COMMAND)
	{
	int index=mlist.getSelectedIndex();
	if(index==0)
	{d.setCurrent(mlist1);
	int index1=mlist1.getSelectedIndex();
	if (c==mNext)
	{
	alert1 =new Alert("OPTION SELECTED","U CHOSE "+mlist1.getString(index1),null,null);
	alert1.setTimeout(Alert.FOREVER);
	d.setCurrent(alert1);
	}
	}
	if(index==1)
	{d.setCurrent(mlist2);
	if (c==mNext)
	{
	int index2=mlist2.getSelectedIndex();
	alert2 =new Alert("OPTION SELECTED","U CHOSE "+mlist2.getString(index2),null,null);
	alert2.setTimeout(Alert.FOREVER);
	d.setCurrent(alert2);
	}
	}
	if(index==2)
	{d.setCurrent(mlist3);
	if (c==mNext)
	{
	int index3=mlist3.getSelectedIndex();
	alert3 =new Alert("OPTION SELECTED","U CHOSE "+mlist3.getString(index3),null,null);
	alert3.setTimeout(Alert.FOREVER);
	d.setCurrent(alert3);
	}
	}
	if(index==3)
	{d.setCurrent(mlist4);
	if (c==mNext)
	{
	int index4=mlist4.getSelectedIndex();
	alert4 =new Alert("OPTION SELECTED","U CHOSE "+mlist4.getString(index4),null,null);
	alert4.setTimeout(Alert.FOREVER);
	d.setCurrent(alert4);
	}
	}
	}
	if (c==mBack)
	{
	d.setCurrent(mlist);
	}
	}
	}

view raw Travel.java hosted with ❤ by GitHub