RFR [8014066] Mistake in documentation of ArrayList#removeRange

Ivan Gerasimov ivan.gerasimov at oracle.com
Thu Mar 13 16:15:50 UTC 2014

Thank you Chris!

It is System.arraycopy() method, where checking is performed and the 
exception is thrown.
Here's this code:
   if ( (((unsigned int) length + (unsigned int) src_pos) > (unsigned 
int) s->length())
      || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned 
int) d->length()) ) {

This confirms that size() is a valid value for fromIndex.

Another way to think of it is that fromIndex <= toIndex, and toIndex can 
be equal to size().
Therefore, fromIndex can be equal to size() too.

The documentation also says that 'If toIndex==fromIndex, this operation 
has no effect.', so removeRange(size(), size()) is a valid expression 
and should not cause an exception be thrown (and it actually does not).

Sincerely yours,

On 13.03.2014 19:47, Chris Hegarty wrote:
> Ivan,
> This does look a little odd, but since fromIndex is inclusive I would think that it should throw if passed a value of size() ??
> -Chris.
> On 13 Mar 2014, at 15:29, Ivan Gerasimov <ivan.gerasimov at oracle.com> wrote:
>> Hello!
>> Would you please review a simple fix of the javadoc for ArrayList#removeRange() method?
>> The doc says that IndexOutOfBoundsException is thrown if fromIndex or toIndex is out of range (fromIndex < 0 || fromIndex >= size() || toIndex > size() || toIndex < fromIndex).
>> The condition 'fromIndex >= size()' isn't true and should be removed from the doc.
>> For example, the code list.removeRange(size(), size()) does not throw any exception.
>> BUGURL: https://bugs.openjdk.java.net/browse/JDK-8014066
>> WEBREV: http://cr.openjdk.java.net/~igerasim/8014066/0/webrev/
>> Sincerely yours,
>> Ivan

More information about the core-libs-dev mailing list