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java 线性表接口的实例详解
前言：
线性表是其组成元素间具有线性关系的一种线性结构，对线性表的基本操作主要有插入、删除、查找、替换等，这些操作可以在线性表的任何位置进行。线性表可以采用顺序存储结构和链式存储结构表示。
本接口的类属于dataStructure包的linearList子包。线性表接口LList声明如下，描述线性表的取值、置值、插入、删除等基本操作。
package dataStructure.linearList;
public interface LList<E>
{
boolean isEmpty(); //判断线性表是否为空，若空返回ture
int length(); //返回线性表长度
E get(int index); //返回序号为index的对象，index初值为0
E set(int index,E element); //设置序号为index对象为element，返回原对象
boolean add(int index,E element); //插入element对象，插入后对象序号为index
boolean add(E element); //插入element对象，插入位置没有约定
E remove(int index); //移去序号为index的对象，放回被移去对象
void clear(); //清空线性表
}顺序存储和链式存储的线性表类（顺序表类和链表类）实现LList接口，提供LList接口中方法的具体实现。例如：
public class SeqList<E> implements LList<E> //顺序表类 public class SinglyLinkedList<E> implements LList<E> //单链表类
LList接口中的方法在顺序表类和链表类中表现出多态性。
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