SingleLinkedList
SingleLinkedList.java 源码
package datastructure.linkedlist;
/**
* @author roseduan[roseduan520@gmail.com]
* @time 2019/10/19 22:20
* @description 单链表基本实现
*/
public class SingleLinkedList {
private ListNode head;
private SingleLinkedList(int val) {
this.head = new ListNode(val);
}
private static class ListNode{
int val;
ListNode next;
ListNode(int val) {
this.val = val;
this.next = null;
}
}
/**
* 查找节点
*/
public ListNode find(int value){
if (head == null){
return null;
}
ListNode p = head;
while (p != null && p.val != value){
p = p.next;
}
return p;
}
/**
* 插入元素
*/
public ListNode add(int value) {
ListNode node = new ListNode(value);
if (head == null) {
head = node;
}
else {
ListNode p = head;
while (p.next != null){
p = p.next;
}
p.next = node;
}
return head;
}
/**
* 删除元素
*/
public boolean remove(int value){
if (head == null){
return false;
}
ListNode prev = null;
ListNode p = head;
while (p != null && p.val != value){
prev = p;
p = p.next;
}
if (p == null){
return false;
}
if (prev == null){
head = head.next;
}
else {
prev.next = p.next;
}
return true;
}
@Override
public String toString() {
StringBuilder result = new StringBuilder();
ListNode p = head;
while (p != null){
result.append(p.val).append(" ");
p = p.next;
}
return result.toString();
}
}
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