一、类继承关系
public class ArrayList<E> extends AbstractList<E>
implements List<E>, RandomAccess, Cloneable, java.io.Serializablepublic class ArrayList<E> extends Abspublic class ArrayList<E> extends AbstractList<E>
implements List<E>, RandomAccess, Cloneable, java.io.Serializablepublic class ArrayList<E> extends Abs