File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
http://aspose.com/file-tools
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes scjp Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
Bookmark "scjp " Watch "scjp " New topic
Author

scjp

Vinod kashid
Greenhorn

Joined: Oct 18, 2013
Posts: 4
i have problem with following code
String[] arr = {"java", "champ", "you"};
System.out.print(Arrays.binarySearch(arr, "java"));
System.out.print(Arrays.binarySearch(arr, "You"));

please explain output of above code.
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 18829
    
  40

Vinod kashid wrote:i have problem with following code
String[] arr = {"java", "champ", "you"};
System.out.print(Arrays.binarySearch(arr, "java"));
System.out.print(Arrays.binarySearch(arr, "You"));

please explain output of above code.


Since the binarySearch() method requires that the array be sorted -- doing a search on an unsorted array, may or may not work.... so, are you saying that it works in some cases, and doesn't in others?

Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
Vinod kashid
Greenhorn

Joined: Oct 18, 2013
Posts: 4
Henry Wong wrote:
Vinod kashid wrote:i have problem with following code
String[] arr = {"java", "champ", "you"};
System.out.print(Arrays.binarySearch(arr, "java"));
System.out.print(Arrays.binarySearch(arr, "You"));

please explain output of above code.


Since the binarySearch() method requires that the array be sorted -- doing a search on an unsorted array, may or may not work.... so, are you saying that it works in some cases, and doesn't in others?

Henry


when i run this code i got output as -3 -1.
but when String[] arr = {"you", "champ", "java"}; output is 2 -1.
here arr[] is also unsorted .
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 18829
    
  40

Vinod kashid wrote:
when i run this code i got output as -3 -1.
but when String[] arr = {"you", "champ", "java"}; output is 2 -1.
here arr[] is also unsorted .



With the array unsorted, it is *broken*. It may or it may not work. And as mentioned in the previous post, you can find examples that work, and you can find examples that won't work.

Henry
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: scjp