Overview
ArrayList? ?? ??? ???? ?? ?????? ???? ?? ??????. ArrayList? ??? ?? ?? ?? ???? ??? ??? ? ????(?? ? ?? ??? ?????).
ArrayList? AbstractList? ???? List、RandomAccess（可以快速訪問）、Cloneable（可以被克?。?、java.io.Serializable(??? ??)? ?????.
? ?? ?? ?? ??? ?? ??: java video
ArrayList? ????? ???? ? ??? ????.
1. ???? ?? ??, ?? ??? ??? ????. 10? ?? ????? ???? ??? ?????.
/**
* Constructs an empty list with an initial capacity of ten.
*/
public ArrayList() {
this.elementData = DEFAULTCAPACITY_EMPTY_ELEMENTDATA;
}?? ?? ???? ?? ? ?? ? ? ????. this.elementData = DEFAULTCAPACITY_EMPTY_ELEMENTDATA, ??? DEFAULTCAPACITY_EMPTY_ELEMENTDATA? ???? ?? ? ????. ?? ??:
/**
* Shared empty array instance used for default sized empty instances. We
* distinguish this from EMPTY_ELEMENTDATA to know how much to inflate when
* first element is added.
*/
private static final Object[] DEFAULTCAPACITY_EMPTY_ELEMENTDATA = {};?? ???? ? ??? ?? ??? ???? ???, ? ?? ??? ??? ? ??? ??? ????? ????? ?? ???? ? ? ????. ?? ??? ?? ????.
2. ??? ?? ??:
/**
* Constructs an empty list with the specified initial capacity.
* @param initialCapacity the initial capacity of the list
* @throws IllegalArgumentException if the specified initial capacity
* is negative
*/
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);
}
}3. Collection ??? ????
/**
* Constructs a list containing the elements of the specified
* collection, in the order they are returned by the collection's
* iterator.
*
* @param c the collection whose elements are to be placed into this list
* @throws NullPointerException if the specified collection is null
*/
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;
}
}?? ?? ?? ? ????: Java ?? ????
? ??? Java?? ArrayList ???? ????? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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