privateclassItrimplementsIterator<E> { int cursor; // index of next element to return int lastRet = -1; // index of last element returned; -1 if no such int expectedModCount = modCount;
Itr() {}
publicbooleanhasNext(){ return cursor != size; }
@SuppressWarnings("unchecked") public E next(){ checkForComodification(); int i = cursor; if (i >= size) thrownew NoSuchElementException(); Object[] elementData = ArrayList.this.elementData; if (i >= elementData.length) thrownew ConcurrentModificationException(); cursor = i + 1; return (E) elementData[lastRet = i]; }
publicvoidremove(){ if (lastRet < 0) thrownew IllegalStateException(); checkForComodification();
@Override @SuppressWarnings("unchecked") publicvoidforEachRemaining(Consumer<? super E> consumer){ Objects.requireNonNull(consumer); finalint size = ArrayList.this.size; int i = cursor; if (i >= size) { return; } final Object[] elementData = ArrayList.this.elementData; if (i >= elementData.length) { thrownew ConcurrentModificationException(); } while (i != size && modCount == expectedModCount) { consumer.accept((E) elementData[i++]); } // update once at end of iteration to reduce heap write traffic cursor = i; lastRet = i - 1; checkForComodification(); }
finalvoidcheckForComodification(){ if (modCount != expectedModCount) thrownew ConcurrentModificationException(); } }
public E next(){ checkForComodification(); int i = cursor; if (i >= size) thrownew NoSuchElementException(); Object[] elementData = ArrayList.this.elementData; if (i >= elementData.length) thrownew ConcurrentModificationException(); cursor = i + 1; return (E) elementData[lastRet = i]; }
publicbooleanremove(Object o){ if (o == null) { for (int index = 0; index < size; index++) if (elementData[index] == null) { fastRemove(index); returntrue; } } else { for (int index = 0; index < size; index++) if (o.equals(elementData[index])) { fastRemove(index); returntrue; } } returnfalse; }
privatevoidfastRemove(int index){ modCount++; int numMoved = size - index - 1; if (numMoved > 0) System.arraycopy(elementData, index+1, elementData, index, numMoved); elementData[--size] = null; // clear to let GC do its work }
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