首页 > 代码库 > 单链表反转(Singly Linked Lists in Java)
单链表反转(Singly Linked Lists in Java)
单链表反转(Singly Linked Lists in Java)
博客分类:- 数据结构及算法
Java代码
- package dsa.linkedlist;
- public class Node<E>{
- E data;
- Node<E> next;
- }
Java代码
- package dsa.linkedlist;
- public class ReverseLinkedListRecursively {
- public static void main(String args[]) {
- ReverseLinkedListRecursively reverser = new ReverseLinkedListRecursively();
- SinglyLinkedList<Integer> originalList = reverser.getLabRatList(10);
- System.out.println("Original List : " + originalList.toString());
- originalList.start = reverser.reverse(originalList.start);
- System.out.println("Reversed List : " + originalList.toString());
- }
- public Node<Integer> reverse(Node<Integer> list) {
- if (list == null || list.next == null)
- return list;
- Node<Integer> nextItem = list.next;
- list.next = null;
- Node<Integer> reverseRest = reverse(nextItem);
- nextItem.next = list;
- return reverseRest;
- }
- private SinglyLinkedList<Integer> getLabRatList(int count) {
- SinglyLinkedList<Integer> sampleList = new SinglyLinkedList<Integer>();
- for (int i = 0; i < count; i++) {
- sampleList.add(i);
- }
- return sampleList;
- }
- }
- /*
- * SAMPLE OUTPUT Original List : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Reversed List : 9,
- * 8, 7, 6, 5, 4, 3, 2, 1, 0
- */
Java代码
- package dsa.linkedlist;
- /**
- * This is a singly linked list with no prev pointer.
- * @author Braga
- * @param <E>
- */
- public class SinglyLinkedList<E> {
- Node<E> start;
- int size;
- public SinglyLinkedList(){
- start = null;
- size = 0;
- }
- //insertAtLast
- public void add(E data){
- insertAtLast(data);
- }
- public void insertAtLast(E data){
- if(size==0){
- start = new Node<E>();
- start.next = null;
- start.data = data;
- }else{
- Node<E> currentNode = getNodeAt(size-1);
- Node<E> newNode = new Node<E>();
- newNode.data = data;
- newNode.next = null;
- currentNode.next = newNode;
- }
- size++;
- }
- public void insertAtFirst(E data){
- if(size==0){
- start = new Node<E>();
- start.next = null;
- start.data = data;
- }else{
- Node<E> newNode = new Node<E>();
- newNode.data = data;
- newNode.next = start;
- start = newNode;
- }
- size++;
- }
- public Node<E> getNodeAt(int nodePos) throws ArrayIndexOutOfBoundsException{
- if(nodePos>=size || nodePos<0){
- throw new ArrayIndexOutOfBoundsException();
- }
- Node<E> temp = start;//Move pointer to front
- int counter = 0;
- for(;counter<nodePos;counter++){
- temp = temp.next;
- }
- return temp;
- }
- public void insertAt(int position, E data){
- if(position == 0){
- insertAtFirst(data);
- }else if(position==size-1){
- insertAtLast(data);
- }else{
- Node<E> tempNode = getNodeAt(position-1);
- Node<E> newNode = new Node<E>();
- newNode.data = data;
- newNode.next = tempNode.next;
- tempNode.next = newNode;
- size++;
- }
- }
- public Node<E> getFirst(){
- return getNodeAt(0);
- }
- public Node<E> getLast(){
- return getNodeAt(size-1);
- }
- public E removeAtFirst(){
- if(size==0){
- throw new ArrayIndexOutOfBoundsException();
- }
- E data = start.data;
- start = start.next;
- size--;
- return data;
- }
- public E removeAtLast(){
- if(size==0){
- throw new ArrayIndexOutOfBoundsException();
- }
- Node<E> tempNode = getNodeAt(size-2);
- E data = tempNode.next.data;
- tempNode.next = null;
- size--;
- return data;
- }
- public E removeAt(int position){
- if(position==0){
- return removeAtFirst();
- }else if(position == size-1){
- return removeAtLast();
- }else{
- Node<E> tempNode = getNodeAt(position-1);
- E data = tempNode.next.data;
- tempNode.next = tempNode.next.next;
- size--;
- return data;
- }
- }
- public int size(){
- return size;
- }
- public String toString(){
- if(size==0){
- return "";
- }else{
- StringBuilder output = new StringBuilder();
- Node<E> tempNode = start;
- while(tempNode.next!=null){
- output.append(tempNode.data).append(", ");
- tempNode = tempNode.next;
- }
- output.append(tempNode.data);
- return output.toString();
- }
- }
- }
Java代码
package dsa.linkedlist; public class Node<E>{ E data; Node<E> next; }
Java代码
package dsa.linkedlist; public class ReverseLinkedListRecursively { public static void main(String args[]) { ReverseLinkedListRecursively reverser = new ReverseLinkedListRecursively(); SinglyLinkedList<Integer> originalList = reverser.getLabRatList(10); System.out.println("Original List : " + originalList.toString()); originalList.start = reverser.reverse(originalList.start); System.out.println("Reversed List : " + originalList.toString()); } public Node<Integer> reverse(Node<Integer> list) { if (list == null || list.next == null) return list; Node<Integer> nextItem = list.next; list.next = null; Node<Integer> reverseRest = reverse(nextItem); nextItem.next = list; return reverseRest; } private SinglyLinkedList<Integer> getLabRatList(int count) { SinglyLinkedList<Integer> sampleList = new SinglyLinkedList<Integer>(); for (int i = 0; i < count; i++) { sampleList.add(i); } return sampleList; } } /* * SAMPLE OUTPUT Original List : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Reversed List : 9, * 8, 7, 6, 5, 4, 3, 2, 1, 0 */
Java代码
package dsa.linkedlist; /** * This is a singly linked list with no prev pointer. * @author Braga * @param <E> */ public class SinglyLinkedList<E> { Node<E> start; int size; public SinglyLinkedList(){ start = null; size = 0; } //insertAtLast public void add(E data){ insertAtLast(data); } public void insertAtLast(E data){ if(size==0){ start = new Node<E>(); start.next = null; start.data = data; }else{ Node<E> currentNode = getNodeAt(size-1); Node<E> newNode = new Node<E>(); newNode.data = data; newNode.next = null; currentNode.next = newNode; } size++; } public void insertAtFirst(E data){ if(size==0){ start = new Node<E>(); start.next = null; start.data = data; }else{ Node<E> newNode = new Node<E>(); newNode.data = data; newNode.next = start; start = newNode; } size++; } public Node<E> getNodeAt(int nodePos) throws ArrayIndexOutOfBoundsException{ if(nodePos>=size || nodePos<0){ throw new ArrayIndexOutOfBoundsException(); } Node<E> temp = start;//Move pointer to front int counter = 0; for(;counter<nodePos;counter++){ temp = temp.next; } return temp; } public void insertAt(int position, E data){ if(position == 0){ insertAtFirst(data); }else if(position==size-1){ insertAtLast(data); }else{ Node<E> tempNode = getNodeAt(position-1); Node<E> newNode = new Node<E>(); newNode.data = data; newNode.next = tempNode.next; tempNode.next = newNode; size++; } } public Node<E> getFirst(){ return getNodeAt(0); } public Node<E> getLast(){ return getNodeAt(size-1); } public E removeAtFirst(){ if(size==0){ throw new ArrayIndexOutOfBoundsException(); } E data = start.data; start = start.next; size--; return data; } public E removeAtLast(){ if(size==0){ throw new ArrayIndexOutOfBoundsException(); } Node<E> tempNode = getNodeAt(size-2); E data = tempNode.next.data; tempNode.next = null; size--; return data; } public E removeAt(int position){ if(position==0){ return removeAtFirst(); }else if(position == size-1){ return removeAtLast(); }else{ Node<E> tempNode = getNodeAt(position-1); E data = tempNode.next.data; tempNode.next = tempNode.next.next; size--; return data; } } public int size(){ return size; } public String toString(){ if(size==0){ return ""; }else{ StringBuilder output = new StringBuilder(); Node<E> tempNode = start; while(tempNode.next!=null){ output.append(tempNode.data).append(", "); tempNode = tempNode.next; } output.append(tempNode.data); return output.toString(); } } }
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