Re: DO WHILE

From:

Lew <noone@lewscanon.com>

Newsgroups:

comp.lang.java.gui

Date:

Wed, 17 Mar 2010 19:51:58 -0400

Message-ID:

<hnrpuv$rh$1@news.albasani.net>

dendeezen wrote:

Iis there a better way to write :
<code>
int s ;
do {
        // blablabla...
}while ( s!=MyArr[0];
             s!=MyArr[1]
       //etc, etc
       );
</code>
or, to search an array for a given number (here that number should not
be in the array) on a more 'nice' way?

John B. Matthews wrote:

Yes, use the for statement:

<http://java.sun.com/docs/books/tutorial/java/nutsandbolts/for.html>

Alternatively, classes implementing the Collection interface offer a
contains() method:

<http://java.sun.com/javase/6/docs/api/java/util/Collection.html>

--
John B. Matthews

Please do not quote sigs.

dendeezen wrote:

I tried, of course, the FOR statement, but could not find the right
way to implement it.

It's called the 'for' statement, since there is no 'FOR' statement in Java.

What exactly did you try? Given that you're using an array, you'll need two
for loops, one scanning the array nested inside the one scanning the test data.

When I try contains(), I get:
Cannot invoke contains(int) on a array type[]

He said "classes implementing the Collection interface offer a contains()
method", not "arrays interface offer a contains() method".

In other words, instead of using an array, use a Collection. Set is probably
the one you want, e.g., HashSet, because lookups happen in "constant time" and
don't require iteration through the collection to determine 'contains()'.

--
Lew