public virtual void remove(){if (this.lastEntryReturned == null){throw new System.InvalidOperationException();}if (this._enclosing.modCount != this.expectedModCount){throw new java.util.ConcurrentModificationException();}this._enclosing.remove(this.lastEntryReturned.key);this.lastEntryReturned = null;this.expectedModCount = this._enclosing.modCount;}