集合源码阅读：ArrayList

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1.继承关系：public class ArrayList<E> extends AbstractList<E>implements List<E>, RandomAccess, Cloneable, java.io.Serializable===================================================2. 属性：// 默认容量private static final int DEFAULT_CAPACITY = 10;// 空数组，第一次存入元素时更新大小为 DEFAULT_CAPACITYprivate static final Object[] EMPTY_ELEMENTDATA = {};// 空数组，默认设定大小为 DEFAULT_CAPACITYprivate static final Object[] DEFAULTCAPACITY_EMPTY_ELEMENTDATA = {};// 添加第一个元素时扩展到默认容量，transient：关闭序列化transient Object[] elementData;// 数组中元素个数private int size;===================================================3.方法：// 构造函数：initialCapacity 集合容量，该值为0时设定集合为 EMPTY_ELEMENTDATA，否则取其正值。public ArrayList(int initialCapacity) {if (initialCapacity > 0) {this.elementData = new Object[initialCapacity];} else if (initialCapacity == 0) {this.elementData = EMPTY_ELEMENTDATA;} else {throw new IllegalArgumentException("Illegal Capacity: "+initialCapacity);}}// 无参构造：默认设定大小为 DEFAULT_CAPACITYpublic ArrayList() {this.elementData = DEFAULTCAPACITY_EMPTY_ELEMENTDATA;}// 构造函数：拷贝已知集合，若参数为空集合则使用 EMPTY_ELEMENTDATA。public ArrayList(Collection<? extends E> c) {elementData = c.toArray();if ((size = elementData.length) != 0) {// c.toArray might (incorrectly) not return Object[] (see 6260652)if (elementData.getClass() != Object[].class)elementData = Arrays.copyOf(elementData, size, Object[].class);} else {// replace with empty array.this.elementData = EMPTY_ELEMENTDATA;}}// 将容量调整为数组的当前大小，可以最小化存储空间。public void trimToSize() {modCount++;if (size < elementData.length) {elementData = (size == 0)? EMPTY_ELEMENTDATA: Arrays.copyOf(elementData, size);}}// 增加此实例的容量，minCapacity 所需的最小容量public void ensureCapacity(int minCapacity) {int minExpand = (elementData != DEFAULTCAPACITY_EMPTY_ELEMENTDATA)// any size if not default element table? 0// larger than default for default empty table. It's already// supposed to be at default size.: DEFAULT_CAPACITY;if (minCapacity > minExpand) {ensureExplicitCapacity(minCapacity);}}private void ensureCapacityInternal(int minCapacity) {if (elementData == DEFAULTCAPACITY_EMPTY_ELEMENTDATA) {minCapacity = Math.max(DEFAULT_CAPACITY, minCapacity);}ensureExplicitCapacity(minCapacity);}private void ensureExplicitCapacity(int minCapacity) {modCount++;// overflow-conscious codeif (minCapacity - elementData.length > 0)grow(minCapacity);}// 数组最大容量（分配过大容量可能会导致 OOM 异常，因为超过了虚拟机限制）private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;// 增加容量到可以容纳 minCapacity 个元素。private void grow(int minCapacity) {// overflow-conscious codeint oldCapacity = elementData.length;int newCapacity = oldCapacity + (oldCapacity >> 1);if (newCapacity - minCapacity < 0)newCapacity = minCapacity;if (newCapacity - MAX_ARRAY_SIZE > 0)newCapacity = hugeCapacity(minCapacity);// minCapacity is usually close to size, so this is a win:elementData = Arrays.copyOf(elementData, newCapacity);}private static int hugeCapacity(int minCapacity) {if (minCapacity < 0) // overflowthrow new OutOfMemoryError();return (minCapacity > MAX_ARRAY_SIZE) ?Integer.MAX_VALUE :MAX_ARRAY_SIZE;}// 返回集合元素个数public int size() {return size;}// 检查是否为空public boolean isEmpty() {return size == 0;}// 检查是否存在元素： o public boolean contains(Object o) {return indexOf(o) >= 0;}// 返回指定元素第一次出现的索引，无则返回 -1 。public int indexOf(Object o) {if (o == null) {for (int i = 0; i < size; i++)if (elementData[i]==null)return i;} else {for (int i = 0; i < size; i++)if (o.equals(elementData[i]))return i;}return -1;}// 返回指定元素最后一次出现的索引，无则返回 -1 。public int lastIndexOf(Object o) {if (o == null) {for (int i = size-1; i >= 0; i--)if (elementData[i]==null)return i;} else {for (int i = size-1; i >= 0; i--)if (o.equals(elementData[i]))return i;}return -1;}// 浅clone，不会复制元素本身。public Object clone() {try {ArrayList<?> v = (ArrayList<?>) super.clone();v.elementData = Arrays.copyOf(elementData, size);v.modCount = 0;return v;} catch (CloneNotSupportedException e) {// this shouldn't happen, since we are Cloneablethrow new InternalError(e);}}// 返回包含所有元素的数组，该数组是安全的。（此方法分配的是一个全新的数组，没有对它的引用存在，故调用者可对其自由修改。）public Object[] toArray() {return Arrays.copyOf(elementData, size);}// 返回包含参数数组中所有元素的数组。@SuppressWarnings("unchecked")public <T> T[] toArray(T[] a) {if (a.length < size)// 建一个 a 类型的新数组, 并填充当前集合的元素到其中。return (T[]) Arrays.copyOf(elementData, size, a.getClass());System.arraycopy(elementData, 0, a, 0, size);if (a.length > size)a[size] = null;return a;}// 返回对应索引位的元素   @SuppressWarnings("unchecked")E elementData(int index) {return (E) elementData[index];}// 返回对应索引位的元素，提供对外访问，调用上一方法。 public E get(int index) {rangeCheck(index);return elementData(index);}// 替换对应索引位的元素public E set(int index, E element) {rangeCheck(index);E oldValue = elementData(index);elementData[index] = element;return oldValue;}// 于末尾新增指定元素public boolean add(E e) {ensureCapacityInternal(size + 1);  // Increments modCount!!elementData[size++] = e;return true;}// 指定索引位插入式新增public void add(int index, E element) {rangeCheckForAdd(index);ensureCapacityInternal(size + 1);  // Increments modCount!!System.arraycopy(elementData, index, elementData, index + 1,size - index);elementData[index] = element;size++;}// 移除对应索引位元素public E remove(int index) {rangeCheck(index);modCount++;E oldValue = elementData(index);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 workreturn oldValue;}// 删除第一个匹配指定元素的元素，若不存在匹配元素则不变。public boolean remove(Object o) {if (o == null) {for (int index = 0; index < size; index++)if (elementData[index] == null) {fastRemove(index);return true;}} else {for (int index = 0; index < size; index++)if (o.equals(elementData[index])) {fastRemove(index);return true;}}return false;}// 快速删除：跳过边界检查，且无返回private void fastRemove(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}// 清空集合public void clear() {modCount++;// clear to let GC do its workfor (int i = 0; i < size; i++)elementData[i] = null;size = 0;}// 追加指定非空集合所有元素到本集合末尾public boolean addAll(Collection<? extends E> c) {Object[] a = c.toArray();int numNew = a.length;ensureCapacityInternal(size + numNew);  // Increments modCountSystem.arraycopy(a, 0, elementData, size, numNew);size += numNew;return numNew != 0;}// 从指定位置开始插入指定非空集合中的所有元素public boolean addAll(int index, Collection<? extends E> c) {rangeCheckForAdd(index);Object[] a = c.toArray();int numNew = a.length;ensureCapacityInternal(size + numNew);  // Increments modCountint numMoved = size - index;if (numMoved > 0)System.arraycopy(elementData, index, elementData, index + numNew,numMoved);System.arraycopy(a, 0, elementData, index, numNew);size += numNew;return numNew != 0;}// 删除介于指定索引位之间的元素protected void removeRange(int fromIndex, int toIndex) {modCount++;int numMoved = size - toIndex;System.arraycopy(elementData, toIndex, elementData, fromIndex,numMoved);// clear to let GC do its workint newSize = size - (toIndex-fromIndex);for (int i = newSize; i < size; i++) {elementData[i] = null;}size = newSize;}// 检查指定索引位是否大于集合总容量，此方法在访问数组元素前使用。private void rangeCheck(int index) {if (index >= size)throw new IndexOutOfBoundsException(outOfBoundsMsg(index));}// add 和 addAll使用的 rangeCheck 版本private void rangeCheckForAdd(int index) {if (index > size || index < 0)throw new IndexOutOfBoundsException(outOfBoundsMsg(index));}// 构造索引越界（下标越界）的返回信息内容：索引值 + 集合总容量大小。private String outOfBoundsMsg(int index) {return "Index: "+index+", Size: "+size;}// 删除指定集合中的所有元素public boolean removeAll(Collection<?> c) {Objects.requireNonNull(c);return batchRemove(c, false);}// 仅保留指定集合中的元素，删除其余元素。public boolean retainAll(Collection<?> c) {Objects.requireNonNull(c);return batchRemove(c, true);}private boolean batchRemove(Collection<?> c, boolean complement) {final Object[] elementData = this.elementData;int r = 0, w = 0;boolean modified = false;try {for (; r < size; r++)if (c.contains(elementData[r]) == complement)elementData[w++] = elementData[r];} finally {// Preserve behavioral compatibility with AbstractCollection,// even if c.contains() throws.if (r != size) {System.arraycopy(elementData, r,elementData, w,size - r);w += size - r;}if (w != size) {// clear to let GC do its workfor (int i = w; i < size; i++)elementData[i] = null;modCount += size - w;size = w;modified = true;}}return modified;}// 保存到流，即：序列化。private void writeObject(java.io.ObjectOutputStream s)throws java.io.IOException{// Write out element count, and any hidden stuffint expectedModCount = modCount;s.defaultWriteObject();// Write out size as capacity for behavioural compatibility with clone()s.writeInt(size);// Write out all elements in the proper order.for (int i=0; i<size; i++) {s.writeObject(elementData[i]);}if (modCount != expectedModCount) {throw new ConcurrentModificationException();}}// 从流重组为集合，即：反序列化。private void readObject(java.io.ObjectInputStream s)throws java.io.IOException, ClassNotFoundException {elementData = EMPTY_ELEMENTDATA;// Read in size, and any hidden stuffs.defaultReadObject();// Read in capacitys.readInt(); // ignoredif (size > 0) {// be like clone(), allocate array based upon size not capacityensureCapacityInternal(size);Object[] a = elementData;// Read in all elements in the proper order.for (int i=0; i<size; i++) {a[i] = s.readObject();}}}// 返回从指定索引位开始的迭代器public ListIterator<E> listIterator(int index) {if (index < 0 || index > size)throw new IndexOutOfBoundsException("Index: "+index);return new ListItr(index);}// 以适当的顺序，返回包含此集合所有元素的集合迭代器。public ListIterator<E> listIterator() {return new ListItr(0);}// 以适当的顺序，返回包含此集合所有元素的迭代器。public Iterator<E> iterator() {return new Itr();}// AbstractList.Itr 的优化版本private class Itr implements Iterator<E> {int cursor;       // index of next element to returnint lastRet = -1; // index of last element returned; -1 if no suchint expectedModCount = modCount;public boolean hasNext() {return cursor != size;}@SuppressWarnings("unchecked")public E next() {checkForComodification();int i = cursor;if (i >= size)throw new NoSuchElementException();Object[] elementData = ArrayList.this.elementData;if (i >= elementData.length)throw new ConcurrentModificationException();cursor = i + 1;return (E) elementData[lastRet = i];}public void remove() {if (lastRet < 0)throw new IllegalStateException();checkForComodification();try {ArrayList.this.remove(lastRet);cursor = lastRet;lastRet = -1;expectedModCount = modCount;} catch (IndexOutOfBoundsException ex) {throw new ConcurrentModificationException();}}@Override@SuppressWarnings("unchecked")public void forEachRemaining(Consumer<? super E> consumer) {Objects.requireNonNull(consumer);final int size = ArrayList.this.size;int i = cursor;if (i >= size) {return;}final Object[] elementData = ArrayList.this.elementData;if (i >= elementData.length) {throw new ConcurrentModificationException();}while (i != size && modCount == expectedModCount) {consumer.accept((E) elementData[i++]);}// update once at end of iteration to reduce heap write trafficcursor = i;lastRet = i - 1;checkForComodification();}final void checkForComodification() {if (modCount != expectedModCount)throw new ConcurrentModificationException();}}// AbstractList.ListItr 的优化版本private class ListItr extends Itr implements ListIterator<E> {ListItr(int index) {super();cursor = index;}public boolean hasPrevious() {return cursor != 0;}public int nextIndex() {return cursor;}public int previousIndex() {return cursor - 1;}@SuppressWarnings("unchecked")public E previous() {checkForComodification();int i = cursor - 1;if (i < 0)throw new NoSuchElementException();Object[] elementData = ArrayList.this.elementData;if (i >= elementData.length)throw new ConcurrentModificationException();cursor = i;return (E) elementData[lastRet = i];}public void set(E e) {if (lastRet < 0)throw new IllegalStateException();checkForComodification();try {ArrayList.this.set(lastRet, e);} catch (IndexOutOfBoundsException ex) {throw new ConcurrentModificationException();}}public void add(E e) {checkForComodification();try {int i = cursor;ArrayList.this.add(i, e);cursor = i + 1;lastRet = -1;expectedModCount = modCount;} catch (IndexOutOfBoundsException ex) {throw new ConcurrentModificationException();}}}// 返回子集合，前闭后开。fromIndex = toIndex 时返回空集合。public List<E> subList(int fromIndex, int toIndex) {subListRangeCheck(fromIndex, toIndex, size);return new SubList(this, 0, fromIndex, toIndex);}static void subListRangeCheck(int fromIndex, int toIndex, int size) {if (fromIndex < 0)throw new IndexOutOfBoundsException("fromIndex = " + fromIndex);if (toIndex > size)throw new IndexOutOfBoundsException("toIndex = " + toIndex);if (fromIndex > toIndex)throw new IllegalArgumentException("fromIndex(" + fromIndex +") > toIndex(" + toIndex + ")");}private class SubList extends AbstractList<E> implements RandomAccess {private final AbstractList<E> parent;private final int parentOffset;private final int offset;int size;SubList(AbstractList<E> parent,int offset, int fromIndex, int toIndex) {this.parent = parent;this.parentOffset = fromIndex;this.offset = offset + fromIndex;this.size = toIndex - fromIndex;this.modCount = ArrayList.this.modCount;}public E set(int index, E e) {rangeCheck(index);checkForComodification();E oldValue = ArrayList.this.elementData(offset + index);ArrayList.this.elementData[offset + index] = e;return oldValue;}public E get(int index) {rangeCheck(index);checkForComodification();return ArrayList.this.elementData(offset + index);}public int size() {checkForComodification();return this.size;}public void add(int index, E e) {rangeCheckForAdd(index);checkForComodification();parent.add(parentOffset + index, e);this.modCount = parent.modCount;this.size++;}public E remove(int index) {rangeCheck(index);checkForComodification();E result = parent.remove(parentOffset + index);this.modCount = parent.modCount;this.size--;return result;}protected void removeRange(int fromIndex, int toIndex) {checkForComodification();parent.removeRange(parentOffset + fromIndex,parentOffset + toIndex);this.modCount = parent.modCount;this.size -= toIndex - fromIndex;}public boolean addAll(Collection<? extends E> c) {return addAll(this.size, c);}public boolean addAll(int index, Collection<? extends E> c) {rangeCheckForAdd(index);int cSize = c.size();if (cSize==0)return false;checkForComodification();parent.addAll(parentOffset + index, c);this.modCount = parent.modCount;this.size += cSize;return true;}public Iterator<E> iterator() {return listIterator();}public ListIterator<E> listIterator(final int index) {checkForComodification();rangeCheckForAdd(index);final int offset = this.offset;return new ListIterator<E>() {int cursor = index;int lastRet = -1;int expectedModCount = ArrayList.this.modCount;public boolean hasNext() {return cursor != SubList.this.size;}@SuppressWarnings("unchecked")public E next() {checkForComodification();int i = cursor;if (i >= SubList.this.size)throw new NoSuchElementException();Object[] elementData = ArrayList.this.elementData;if (offset + i >= elementData.length)throw new ConcurrentModificationException();cursor = i + 1;return (E) elementData[offset + (lastRet = i)];}public boolean hasPrevious() {return cursor != 0;}@SuppressWarnings("unchecked")public E previous() {checkForComodification();int i = cursor - 1;if (i < 0)throw new NoSuchElementException();Object[] elementData = ArrayList.this.elementData;if (offset + i >= elementData.length)throw new ConcurrentModificationException();cursor = i;return (E) elementData[offset + (lastRet = i)];}@SuppressWarnings("unchecked")public void forEachRemaining(Consumer<? super E> consumer) {Objects.requireNonNull(consumer);final int size = SubList.this.size;int i = cursor;if (i >= size) {return;}final Object[] elementData = ArrayList.this.elementData;if (offset + i >= elementData.length) {throw new ConcurrentModificationException();}while (i != size && modCount == expectedModCount) {consumer.accept((E) elementData[offset + (i++)]);}// update once at end of iteration to reduce heap write trafficlastRet = cursor = i;checkForComodification();}public int nextIndex() {return cursor;}public int previousIndex() {return cursor - 1;}public void remove() {if (lastRet < 0)throw new IllegalStateException();checkForComodification();try {SubList.this.remove(lastRet);cursor = lastRet;lastRet = -1;expectedModCount = ArrayList.this.modCount;} catch (IndexOutOfBoundsException ex) {throw new ConcurrentModificationException();}}public void set(E e) {if (lastRet < 0)throw new IllegalStateException();checkForComodification();try {ArrayList.this.set(offset + lastRet, e);} catch (IndexOutOfBoundsException ex) {throw new ConcurrentModificationException();}}public void add(E e) {checkForComodification();try {int i = cursor;SubList.this.add(i, e);cursor = i + 1;lastRet = -1;expectedModCount = ArrayList.this.modCount;} catch (IndexOutOfBoundsException ex) {throw new ConcurrentModificationException();}}final void checkForComodification() {if (expectedModCount != ArrayList.this.modCount)throw new ConcurrentModificationException();}};}public List<E> subList(int fromIndex, int toIndex) {subListRangeCheck(fromIndex, toIndex, size);return new SubList(this, offset, fromIndex, toIndex);}private void rangeCheck(int index) {if (index < 0 || index >= this.size)throw new IndexOutOfBoundsException(outOfBoundsMsg(index));}private void rangeCheckForAdd(int index) {if (index < 0 || index > this.size)throw new IndexOutOfBoundsException(outOfBoundsMsg(index));}private String outOfBoundsMsg(int index) {return "Index: "+index+", Size: "+this.size;}private void checkForComodification() {if (ArrayList.this.modCount != this.modCount)throw new ConcurrentModificationException();}public Spliterator<E> spliterator() {checkForComodification();return new ArrayListSpliterator<E>(ArrayList.this, offset,offset + this.size, this.modCount);}}@Overridepublic void forEach(Consumer<? super E> action) {Objects.requireNonNull(action);final int expectedModCount = modCount;@SuppressWarnings("unchecked")final E[] elementData = (E[]) this.elementData;final int size = this.size;for (int i=0; modCount == expectedModCount && i < size; i++) {action.accept(elementData[i]);}if (modCount != expectedModCount) {throw new ConcurrentModificationException();}}// 创建一个拆分器，@since 1.8。@Overridepublic Spliterator<E> spliterator() {return new ArrayListSpliterator<>(this, 0, -1, 0);}// 延迟初始化的拆分器。static final class ArrayListSpliterator<E> implements Spliterator<E> {// 如果集合结构是不变的，没有CRUD操作，则用 Arrays.spliterator 实现拆分. private final ArrayList<E> list;private int index; // current index, modified on advance/splitprivate int fence; // -1 until used; then one past last indexprivate int expectedModCount; // initialized when fence set/ Create new spliterator covering the given  range /ArrayListSpliterator(ArrayList<E> list, int origin, int fence,int expectedModCount) {this.list = list; // OK if null unless traversedthis.index = origin;this.fence = fence;this.expectedModCount = expectedModCount;}private int getFence() { // initialize fence to size on first useint hi; // (a specialized variant appears in method forEach)ArrayList<E> lst;if ((hi = fence) < 0) {if ((lst = list) == null)hi = fence = 0;else {expectedModCount = lst.modCount;hi = fence = lst.size;}}return hi;}public ArrayListSpliterator<E> trySplit() {int hi = getFence(), lo = index, mid = (lo + hi) >>> 1;return (lo >= mid) ? null : // divide range in half unless too smallnew ArrayListSpliterator<E>(list, lo, index = mid,expectedModCount);}public boolean tryAdvance(Consumer<? super E> action) {if (action == null)throw new NullPointerException();int hi = getFence(), i = index;if (i < hi) {index = i + 1;@SuppressWarnings("unchecked") E e = (E)list.elementData[i];action.accept(e);if (list.modCount != expectedModCount)throw new ConcurrentModificationException();return true;}return false;}public void forEachRemaining(Consumer<? super E> action) {int i, hi, mc; // hoist accesses and checks from loopArrayList<E> lst; Object[] a;if (action == null)throw new NullPointerException();if ((lst = list) != null && (a = lst.elementData) != null) {if ((hi = fence) < 0) {mc = lst.modCount;hi = lst.size;}elsemc = expectedModCount;if ((i = index) >= 0 && (index = hi) <= a.length) {for (; i < hi; ++i) {@SuppressWarnings("unchecked") E e = (E) a[i];action.accept(e);}if (lst.modCount == mc)return;}}throw new ConcurrentModificationException();}public long estimateSize() {return (long) (getFence() - index);}public int characteristics() {return Spliterator.ORDERED | Spliterator.SIZED | Spliterator.SUBSIZED;}}// Predicate 函数式编程，参见个人博客 ：https://blog.csdn.net/jiangyu1013/article/details/103500724@Overridepublic boolean removeIf(Predicate<? super E> filter) {Objects.requireNonNull(filter);// figure out which elements are to be removed// any exception thrown from the filter predicate at this stage// will leave the collection unmodifiedint removeCount = 0;final BitSet removeSet = new BitSet(size);final int expectedModCount = modCount;final int size = this.size;for (int i=0; modCount == expectedModCount && i < size; i++) {@SuppressWarnings("unchecked")final E element = (E) elementData[i];if (filter.test(element)) {removeSet.set(i);removeCount++;}}if (modCount != expectedModCount) {throw new ConcurrentModificationException();}// shift surviving elements left over the spaces left by removed elementsfinal boolean anyToRemove = removeCount > 0;if (anyToRemove) {final int newSize = size - removeCount;for (int i=0, j=0; (i < size) && (j < newSize); i++, j++) {i = removeSet.nextClearBit(i);elementData[j] = elementData[i];}for (int k=newSize; k < size; k++) {elementData[k] = null;  // Let gc do its work}this.size = newSize;if (modCount != expectedModCount) {throw new ConcurrentModificationException();}modCount++;}return anyToRemove;}// Predicate 函数式编程，参见个人博客 ：https://blog.csdn.net/jiangyu1013/article/details/103500724@Override@SuppressWarnings("unchecked")public void replaceAll(UnaryOperator<E> operator) {Objects.requireNonNull(operator);final int expectedModCount = modCount;final int size = this.size;for (int i=0; modCount == expectedModCount && i < size; i++) {elementData[i] = operator.apply((E) elementData[i]);}if (modCount != expectedModCount) {throw new ConcurrentModificationException();}modCount++;}@Override@SuppressWarnings("unchecked")public void sort(Comparator<? super E> c) {final int expectedModCount = modCount;Arrays.sort((E[]) elementData, 0, size, c);if (modCount != expectedModCount) {throw new ConcurrentModificationException();}modCount++;}
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