implementing persistance with BigVector

[Komal Amaresh]

Hi,

I' am working on blackberry. I'am trying to store a string values using BigVector. As BigVector itself implements Persistable, I'am not implementing the Persistable interface. I 'am storing the data in a Bigvector and retrieving all the values in a list. The data is not getting stored persistably.

Does BigVector help store data persistably just by passing values to it or do we have to implement the persistable interface.
The code I have implemented is......

package pack1;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;
import net.rim.device.api.collection.util.*;

public class VectorDemo extends UiApplication
{
	BigVector v1 = new BigVector();
	ObjectListField list1;
	public static void main(String[] args)
	{
		VectorDemo vd = new VectorDemo();
		vd.enterEventDispatcher();
	}
	
	public VectorDemo()
	{
		pushScreen(new VectorScreen());
	}
	
	
	class VectorScreen extends MainScreen
	{
		
		String s1;
		EditField nm;
		
		
		
		public VectorScreen()
		{
			
			//v1 = new BigVector();
			
			nm = new EditField("Name: ","");
			add(nm);

			//Dialog.inform("size: "+ v1.size());
			addMenuItem(save);
			addMenuItem(show);
		
		}
		MenuItem save = new MenuItem("Save",110,10)
		{
			public void run()
			{
				s1 = nm.getText();
				v1.addElement(s1);
				
				nm.setText(null);
				list1 = new ObjectListField();
				for(int i = 0; i < v1.size(); i++)
				{
					String s2 = (String)v1.elementAt(i);
					list1.insert(list1.getSize(), s2);					
				}				
				Dialog.alert("Saved....."+v1.size()+"..list1.."+list1.getSize());
			}
		};
		MenuItem show = new MenuItem("Display",110,10)
		{
			public void run()
			{
//			
				pushScreen(new ListScreen());
			}
		};
	}
	class ListScreen extends MainScreen
	{
			
		public ListScreen()
		{
			Dialog.inform(list1.getSize()+"");
			add(list1);
			addMenuItem(back);
		}
		MenuItem back = new MenuItem("Back",110,10)
		{
			public void run()
			{
//				
				popScreen(getActiveScreen());
			}
		};
		
	}


}

Please help me with the bigVector. I wonder how to inplement persistance with it.

Thanks in advance

regards,
Komal