package com.coding.basic; public class LinkedList implements List { private Node head; private int length; //构造函数 public LinkedList(){ clear(); } public final void clear(){ head = null; length = 0; } public void add(Object o){ Node newNode = new Node(o); if(length == 0) { head = newNode; } else{ Node lastNode = getNodeAt(length); lastNode.next = newNode; } length++; } public void add(int index , Object o){ Node newNode = new Node(o); Node nodeBefor = getNodeAt(index-1); Node nodeAfter = nodeBefor.next; newNode.next = nodeAfter; nodeBefor.next = newNode; length++; } public Object get(int index){ if((1<=index)&&(index<=length)) { Node currentNode = head; for(int i= 0;i<index;i++) { currentNode = currentNode.next; } return currentNode.data; } else return null; } public Object remove(int index){ Node nodeBefor = getNodeAt(index-1); Node nodeToRemove = nodeBefor.next; Node nodeAfter = nodeToRemove.next; nodeBefor.next = nodeAfter; length--; return nodeToRemove.data; } public int size(){ return length; } public void addFirst(Object o){ Node newNode = new Node(o); newNode.next = head; head = newNode; length++; } public void addLast(Object o){ Node newNode = new Node(o); Node lastNode = getNodeAt(length); lastNode.next = newNode; length++; } public Object removeFirst(){ head = head.next; length--; return head.data; } public Object removeLast(){ Node nodeLastBefore = getNodeAt(length-1); Object result = nodeLastBefore.next.data; nodeLastBefore.next =null; length--; return result; } public Iterator iterator(){ return null; } private Node getNodeAt(int givenPosition){ if((1<=givenPosition)&&(givenPosition <=length)){ Node currentNode = head; for (int counter = 1;counter<givenPosition;counter++) currentNode = currentNode.next; return currentNode; }else return null; } private static class Node{ private Object data; private Node next; private Node(Object dataPortion){ data = dataPortion; next = null; } private Node(Object dataPortion,Node nextNode) { data = dataPortion; next = nextNode; } } /** * 把该链表逆置 * 例如链表为 3->7->10 , 逆置后变为 10->7->3 */ public void reverse(){ } /** * 删除一个单链表的前半部分 * 例如:list = 2->5->7->8 , 删除以后的值为 7->8 * 如果list = 2->5->7->8->10 ,删除以后的值为7,8,10 */ public void removeFirstHalf(){ } /** * 从第i个元素开始, 删除length 个元素 , 注意i从0开始 * @param i * @param length */ public void remove(int i, int length){ } /** * 假定当前链表和list均包含已升序排列的整数 * 从当前链表中取出那些list所指定的元素 * 例如当前链表 = 11->101->201->301->401->501->601->701 * listB = 1->3->4->6 * 返回的结果应该是[101,301,401,601] * @param list */ public static int[] getElements(LinkedList list){ return null; } /** * 已知链表中的元素以值递增有序排列,并以单链表作存储结构。 * 从当前链表中中删除在list中出现的元素 * @param list */ public void subtract(LinkedList list){ } /** * 已知当前链表中的元素以值递增有序排列,并以单链表作存储结构。 * 删除表中所有值相同的多余元素(使得操作后的线性表中所有元素的值均不相同) */ public void removeDuplicateValues(){ } /** * 已知链表中的元素以值递增有序排列,并以单链表作存储结构。 * 试写一高效的算法,删除表中所有值大于min且小于max的元素(若表中存在这样的元素) * @param min * @param max */ public void removeRange(int min, int max){ } /** * 假设当前链表和参数list指定的链表均以元素依值递增有序排列(同一表中的元素值各不相同) * 现要求生成新链表C,其元素为当前链表和list中元素的交集,且表C中的元素有依值递增有序排列 * @param list */ public LinkedList intersection( LinkedList list){ return null; } }