Sorry, I did not notice that this was already answered. ;)
On Wed, Feb 16, 2011 at 5:49 PM, Lawrence Louie <[email protected]>wrote:
> import java.util.Collections;
> import java.util.Iterator;
> import java.util.LinkedList;
> import java.util.List;
>
> public class Question {
>
> /**
> * @param args
> */
> public static void main(String[] args) {
> // TODO Auto-generated method stub
>
>
> List ll = new LinkedList();
> ll.add(new Integer (5));
> ll.add(new Integer (8));
> ll.add(new Integer (3));
> ll.add(new Integer (4));
>
>
> int index5 = Collections.binarySearch(ll, new Integer(5));
> int index8 = Collections.binarySearch(ll, new Integer(8));
> int index3 = Collections.binarySearch(ll, new Integer(3));
> int index4 = Collections.binarySearch(ll, new Integer(4));
> System.out.println(ll);
> System.out.println("5 is in index " + index5);
> System.out.println("8 is in index " + index8);
> System.out.println("3 is in index " + index3);
> System.out.println("4 is in index " + index4);
>
>
> }
>
> }
>
> Output is:
> -------------------------------
> [5, 8, 3, 4]
> 5 is in index 0
> 8 is in index 1
> 3 is in index -1
> 4 is in index -1
>
> Instead of using the LinkedList, I have also tried it with ArrayList,
> same result.
>
> Questions: why is 3 or 4 returns -1 in the index? Thx.
>
> Lawrence Louie
>
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