package main

import (
    "sync"
    "fmt"
)

func main() {
    node := Instance()
    node.Name = "张三"

    node1 := &Node{Name: "李四"}
    node2 := &Node{Name: "赵武"}
    node3 := &Node{Name: "李刘"}
    InsertNode(node, node1)
    InsertNode(node, node2)
    InsertNode(node, node3)

    ListNode(node)
}

type Node struct {
    Name    string
    NodePtr *Node
}

var node *Node
var once sync.Once

func Instance() (*Node) {
    once.Do(func() {
        if node == nil {
            node = &Node{}
        }
    })
    return node
}

//单链表追加节点
func InsertNode(oldNode, newNode *Node) {
    for {
        if oldNode.NodePtr == nil {
            break
        }
        //地址指向下一个节点的地址
        oldNode = oldNode.NodePtr
    }
    oldNode.NodePtr = newNode
}

func ListNode(node *Node) {
    if node.NodePtr == nil {
        return
    }
    for {
        fmt.Printf("NodeName==>%s==>", node.Name)
        node = node.NodePtr
        if node.NodePtr == nil {
            fmt.Printf("NodeName==>%s", node.Name)
            break
        }
    }

}

输出结果

NodeName==>张三==>NodeName==>李四==>NodeName==>赵武==>NodeName==>李刘
Process finished with exit code 0