girlnote322.java

girlnote322.java

// https://twitter.com/hyuki/status/1390535639469158403/

class Node {
    int value;
    Node next;

    public Node(int value, Node next) {
        this.value = value;
        this.next = next;
    }

    public static Node asNode(int... values) {
        Node p = null;
        for (int i = values.length - 1; i >= 0; i--) {
            p = new Node(values[i], p);
        }
        return p;
    }

    public static void println(Node p) {
        while (p != null) {
            System.out.print(p.value);
            p = p.next;
            if (p != null) {
                System.out.print(" → ");
            }
        }
        System.out.println();
    }

    public static void main(String[] args) {
        Node L = asNode(31, 41, 59, 26, 53);
        Node p = L.next.next;
        println(L);
        //
        L.next.next = p.next;
        p.next = L;
        L = p;
        //
        println(L);
    }
}

$ java girlnote322.java
31 → 41 → 59 → 26 → 53
59 → 31 → 41 → 26 → 53