Package java.util
Interface Collection
abstract boolean remove(Object o)
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Description:
Removes a single instance of the specified element from this collection, if it is present (optional operation).
More formally, removes an element e such that (o==null ? e==null : o.equals(e)), if this collection contains one or more such elements. Returns true if this collection contained the specified element (or equivalently, if this collection changed as a result of the call).