public class SingleLinkedList {
private int size;//链表节点的个数
private Node head;//头节点
public SingleLinkedList(){
size = 0;
head = null;
}
//链表的每个节点类
private class Node{
private Object data;//每个节点的数据
private Node next;//每个节点指向下一个节点的连接
public Node(Object data){
this.data = data;
}
}
//在链表头添加元素
public Object addHead(Object obj){
Node newHead = new Node(obj);
if(size == 0){
head = newHead;
}else{
newHead.next = head;
head = newHead;
}
size++;
return obj;
}
//在链表头删除元素
public Object deleteHead(){
Object obj = head.data;
head = head.next;
size--;
return obj;
}
//查找指定元素，找到了返回节点Node，找不到返回null
public Node find(Object obj){
Node current = head;
int tempSize = size;
while(tempSize > 0){
if(obj.equals(current.data)){
return current;
}else{
current = current.next;
}
tempSize--;
}
return null;
}
//删除指定的元素，删除成功返回true
public boolean delete(Object value){
if(size == 0){
return false;
}
Node current = head;
Node previous = head;
while(current.data != value){
if(current.next == null){
return false;
}else{
previous = current;
current = current.next;
}
}
//如果删除的节点是第一个节点
if(current == head){
head = current.next;
size--;
}else{//删除的节点不是第一个节点
previous.next = current.next;
size--;
}
return true;
}
//判断链表是否为空
public boolean isEmpty(){
return (size == 0);
}
//显示节点信息
public void display(){
if(size >0){
Node node = head;
int tempSize = size;
if(tempSize == 1){//当前链表只有一个节点
System.out.println("["+node.data+"]");
return;
}
while(tempSize>0){
if(node.equals(head)){
System.out.print("["+node.data+"->");
}else if(node.next == null){
System.out.print(node.data+"]");
}else{
System.out.print(node.data+"->");
}
node = node.next;
tempSize--;
}
System.out.println();
}else{//如果链表一个节点都没有，直接打印[]
System.out.println("[]");
}
}
}
