linked构造函数
1、LinkedList(); 构造一个空列表的集合
/** * 序列化 */ private static final long serialVersionUID = 1090589487753660476L; private transient Entry<E> header = new Entry<E>(null, null, null); private transient int size = 0; /** * @author root * 内部类 */ private static class Entry<E>{ E element; Entry<E> next; Entry<E> previous; Entry(E element,Entry<E> next,Entry<E> previous){ this.element = element; this.next = next; this.previous = previous; } } public LinkeList() { header.next = header.previous = header; }
2、