Java单链表实现

• 实现代码

class  SingleLinkedList{
    //初始化头节点
    private HeroNode head = new HeroNode(0,"","");

    //在链表尾部添加节点
    public void add(int no , String name, String nickname){
        HeroNode cur = head ;
        //令cur指向尾节点
        while (cur.next != null){
            cur = cur.next;
        }
        //此时cur指向尾节点,开始插入
        HeroNode newNode = new HeroNode(no,name,nickname);
        cur.next = newNode;
    }

    //通过编号插入,插入时会根据英雄的编号来插入
    public void addByOrder(int no , String name, String nickname){
        HeroNode newNode = new HeroNode(no,name,nickname);
        //1.if list is null
        if(null == head.next){
            head.next = newNode;
        }
        //2. if list is not null
        else{
            //find appropriate location and insert
            HeroNode cur = head;
            while(null != cur.next){
                if(newNode.no < cur.next.no){
                    //newNode.no比cur.next.no小,直接插入到cur后
                    newNode.next = cur.next;
                    cur.next = newNode;
                    //插入完成，返回
                    return ;
                }
                else if(newNode.no == cur.next.no){
                    System.out.println("该编号已存在，请重新插入！");
                    return ;
                }
                else{
                    //newNode.no不满足比cur.next.no小
                    //移动cur
                    cur = cur.next;
                }
            }
            //此时cur指向尾节点，这时直接插入尾节点后面
            cur.next = newNode;
        }
    }

    //通过no来修改节点
    public void update(int no , String name , String nickname){
        //判断链表是否为空
        if(null == head.next) {
            System.out.println("链表为空！");
            return;
        }
        //创建辅助节点cur
        HeroNode cur = head.next;
        //寻找cur.no == no的节点
        while(null != cur){
            //判断cur.no
            if(cur.no == no){
                //找到节点，修改name和nickname
                cur.name = name;
                cur.nickname = nickname;
                return;
            }
            cur = cur.next;
        }
        System.out.println("您输入的编号有误,修改失败");
    }

    //删除节点
    public void deleNode(int no){
        //判断链表是否为空
        if(null == head.next){
            System.out.println("链表为空，删除失败");
            return;
        }
        //创建辅助指针
        HeroNode cur = head;
        //遍历链表
        while(null != cur.next){
            if(cur.next.no == no){
                //找到要删除的节点
                cur.next = cur.next.next;
                return;
            }
            cur = cur.next;
        }
        //遍历结束，没有找到要删除的节点
        System.out.println("没有找到要删除的节点，删除失败！");
    }

    //遍历链表
    public void traverse(){
        //判断链表是否为空
        if(null == head.next){
            System.out.println("链表为空，遍历失败");
            return;
        }
        //辅助指针
        HeroNode cur = head.next;
        while(null != cur){
            System.out.println(cur);
            cur = cur.next;
        }
    }
}

//定义HeroNode,每个HeroNode对象是一个节点
class HeroNode{
    //成员属性
    public int no;
    public String name;
    public String nickname;
    public HeroNode next;//指向下一个节点
    //构造器
    public HeroNode(int no , String name , String nickname){
        this.no = no;
        this.name = name;
        this.nickname = nickname;
        this.next = null;
    }
    //为了显示方便，重写toString方法
    @Override
    public String toString() {
        return "HeroNode{" +
                "no=" + no +
                ", name='" + name + ''' +
                ", nickname='" + nickname + ''' +
                '}';
    }
}