Limiting size of ArrayList

[ravian]

Hi guys,

ArrayList can grow as the elements are added to it. Is there a was to define the upper limit of the ArrayList? For example, I want my ArrayList to throw some Exception when 101th element is added.

Thanks for your time.

[CaptainMorgan]

You're probably looking for an API defined way to accomplish this, and I'm not certain there is one. Therefore, there shouldn't be anything wrong with using a standard control statement, ie: for loop. Soo...

Code:

1) for all elements up to and including 100 
    // ..... do something...
 // if attempt to add past 100
    // throw exception(which is kinda of pointless since that's what the control
    //  statement was for - only elements up to an including 100)

[JAdmin]

Agree with Captain. You cannot limit the size of an ArrayList. You will have to come up with a mechanism to achieve this.

You may subclass the ArrayList and implement your own code to prevent the size from growing beyond a limit.

Something like

public final class MyList extends ArrayList{

...
....
public boolean add(Object o) throws Throwable{
if(this.size() < 100)
//add
else
throw new MaxSizeReachedException("Limit reached");

}

}

note : The above code is a kind of sudo code, just to give you an idea of what we meant.

Hope this helps!

[gibsonrocker800]

Yeah i would personally just do something like

Code:

ArrayList<String> list = new ArrayList<String();
if(list.get(100) != null)  //If there exists a 101th element
{
     throw new ArrayIndexOutOfBoundsException();
}