// Implementation of problem 11.13 on page 447, use an ArrayList to store input values from the user
// but not duplicates


import java.util.*;							// needed for both ArrayList and Scanner

public class Prog11_13
{
	public static void main(String[] args)
	{ 
		ArrayList<Integer> list = new ArrayList<Integer>();
		Scanner in = new Scanner(System.in);
		int temp;
		Integer boxedTemp;					// we will box the int value and see if its a duplicate before adding it to the ArrayList
		System.out.print("Enter int values, negative to exit  ");
		temp = in.nextInt();
		while(temp>=0)
		{
			boxedTemp=new Integer(temp);	// box the int value
			if(list.contains(boxedTemp)) System.out.println("duplicated value detected");	// list.contains(Object o) tests to see if o is in list yet, if so, output warning
			else list.add(boxedTemp);				// otherwise add it to the list
			System.out.print("Enter int values, negative to exit  ");
			temp = in.nextInt();	
		
		}
		System.out.println("\n\n" + list);		// we can output an entire ArrayList with one instruction, the ArrayList's output looks like this [1, 2, 3, 4, 5]
	}
}