[rajiv_bang]

This might not be the best implementation, but this might give you an idea. I have used a StringBuffer in the code below because String is immutable. HTH

Code:

import java.text.DateFormat;
import java.util.*;
public class LargestString
{
public static void main(String args[])
 {
	ArrayList <String> list = new ArrayList<String>();
	list.add("ABC");
	list.add("XYZ");
	list.add("KLM");
	StringBuffer largest = new StringBuffer("");
	for(int i=0; i<list.size(); i++){
		if(list.get(i).compareTo(largest.toString())>0){
			largest.setLength(0);
			largest.append(list.get(i));
		}
	}
	System.out.println(largest.toString());
 }
}