checking among a range of values

[shree vijay]

Hi,
i remember that in some language , we have a feature that is somewhat similar to this :
int i;
if (i IN (2,5,7, 8,11,13, 12,17))
{
// DO SOMETHING
}
I have used the syntax as a help of course. This is not the way it is in C,C++.
Is there anything similar in Java? Or, do have to cascade in
a switch or else use multiple | | (conditional OR) ?
Shree

[Stephanie Grasson]

Shree,
You could use a set. Here is one example:

import java.util.TreeSet;
class Test
{
    public static void main(String args[])
    {
        TreeSet ts = new TreeSet();
        ts.add(new Integer(2));
        ts.add(new Integer(5));
        ts.add(new Integer(7));
        ts.add(new Integer(8));
        ts.add(new Integer(11));
        ts.add(new Integer(13));
        ts.add(new Integer(12));
        ts.add(new Integer(17));
        int i = 17;
        if(ts.contains(new Integer(i)))
        {
            System.out.println(i + " IS in the set.");
        }
        else
        {
            System.out.println(i + " is NOT in the set.");
        }
    }
}

Hope this helps.
Stephanie

[Steve Fahlbusch]

Shree,
another way to do this is a compound switch statement:class
<pre>
TestSwitch {
public static void main ( String[] args ) {

int i = 2;
switch ( i ) {
case 2:
case 5:
case 7:
case 8:
case 11:
case 13:
case 12:
case 17:
System.out.println("Value Found");
break;
default:
System.out.println("Value not found");
}
}
}
</pre>
But unless i were writting imbedded code (very small) or
extreamly time critical Stephanie's method is far better.

[shree vijay]

Thanks,

By the way, steve, does a switch become a 'compound switch' when you cascade more than one case statement?

Shree

[Steve Fahlbusch]

Shree,
Compound Switch {sounds good, but i have never heard of such
a creature - but then there an awful lot i don't know}
Steve

[Apu Nahasapeemapetilon]

Steve,
You wrote;

Shree,
another way to do this is a compound switch statement:class

He asking you what you meant by that. I think you mean a cascading switch, very populat in C++.
Shree,
Steve is right, Stephs concept is a little better, both require hard coding of the data, something that gives Apu a brain freeze faster than engulfing squishees, but...
A compound switch would indeed imply a switch statement inside another's case. Though, I am having trouble try to come up with a good reason to do this, wait...

switch (orderStatus){
   case 's';//shipped
     switch (getShipper){
       case 'u';
          shipper = "UPS";
          break;
       case 'p'
          shipper = "Post Office";
          break;
      }
      //mo stuff here
}

something like that, though there may be more elegant ways.