[
https://issues.apache.org/jira/browse/COLLECTIONS-674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16938352#comment-16938352
]
Chen edited comment on COLLECTIONS-674 at 9/26/19 7:06 AM:
---
{code:java}
public static Collection drain(Collection input, int start, int
count) {
if (null == input) {
throw new IllegalArgumentException("The collection
can't be null.");
}
if (start < 0) {
throw new IllegalArgumentException("The Start can't
less than 0.");
}
if (count < 1) {
throw new IllegalArgumentException("The Count can't
less than 1.");
}
if (input.size() < start + count) {
throw new IllegalArgumentException(
"The sum of start and count cann't be
greater than the size of collection.");
}
Collection result = new ArrayList(count);
Iterator iterator = input.iterator();
while (count > 0) {
result.add(iterator.next());
iterator.remove();
count = count - 1;
}
return result;
}
{code}
was (Author: guoping1):
{code:java}
public static Collection drain(Collection input, int start, int
count) {
if (null == input) {
throw new IllegalArgumentException("The Collection of
Input can't be null.");
}
if (start < 0) {
throw new IllegalArgumentException("The Start can't
less than 0.");
}
if (count < 1) {
throw new IllegalArgumentException("The Count can't
less than 1.");
}
if (input.size() < start + count) {
throw new IllegalArgumentException(
"The sum of start and count cann't be
greater than the size of collection.");
}
Collection result = new ArrayList(count);
Iterator iterator = input.iterator();
while (count > 0) {
result.add(iterator.next());
iterator.remove();
count = count - 1;
}
return result;
}
{code}
> Add Collections Drain Method
>
>
> Key: COLLECTIONS-674
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-674
> Project: Commons Collections
> Issue Type: Improvement
> Components: Collection
>Affects Versions: 4.1
>Reporter: David Mollitor
>Priority: Major
>
> Add a {{Collections.drain()}} method which removes the first N elements from
> the collection and returns them. This method would have the side-effect of
> modifying the input collections (due to removal).
>
> {code:java}
> // Some suggestions
> void Collections.drain(Collection from, Collection to, int count);
> Collection Collections.drain(Collection from, int count);{code}
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