/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		List<String> list = Arrays.asList();
		Scanner scanner = new Scanner(System.in);
		String in;
		System.out.println("Type a string and hit enter to enter it into the list. Type 'exit' when you are done.");
		while (scanner.hasNextLine() && !(in = scanner.nextLine()).equalsIgnoreCase("exit")) {
			list.add(in);
		}
		System.out.println("Compiling now...");
				System.out.println(toString(list, ", ", ". The end."));
				scanner.close();
	}
 
	public static String toString(List<String> list) {
  		return toString(list, ", ", null);
	}
 
	public static String toString(List<String> list, String separator, String ending) {
  		if (list == null || list.isEmpty() || list.get(0) == null)
    		return "";
  		if (list.size() == 1)
    		return list.get(0);
  		if (list.size() == 2)
    		return list.get(0) + " and " + list.get(1);
  		StringBuilder str = new StringBuilder(list.get(0));
  		for (int i = 1; i < list.size() - 1; i++)
    		str.append(separator).append(list.get(i));
  		str.append(separator).append("and ").append(list.get(list.size() - 1)).append((ending != null ? ending : ""));
  		return str.toString();
	}
 
}

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YXcKVGhpcwppcwphCnN0cmluZwpUaGlzCmlzCmEKc3RyaW5nCmV4aXQK

aw
This
is
a
string
This
is
a
string
exit