Question: How can I take the output of a while loop and pass it to a for loop?

I get some id from my sql db using while loop. Now, how to pass each id to select query?

For example:

```
while($row = mysql_fetch_array($sql)) {
    $y= $row['c'];
} 

```

How can I pass each $y to a select query?

Answer: 
Actually the HotSpot compiler would most likely inline calls to your getters, so no overhead will be involved (besides, the overhead for calling these methods would hardly be measurable).

**EDIT**

If you *really* need every CPU cycle, use C or C++ (or write performance-critical parts in it and call it via JNA, though its unlikely that it will be worth the time spent).
yes.. we can make a variable read-only using **final** keyword

Ex: `public final int id = 10;`