我有一个单独的链接列表叫做ranklist。在这个列表中，我插入了诸如id、Map点和不同商店的得分等信息。
我的实现代码：

class RankList {
private Node first;
private int nodeCount;
private Record record;

public static void main(String[] args) {
    //Inserting values for a node
    //Data for the first node
    RankList list = new RankList();
    Point point = new Point(5.4, 3.2);
    Record record = new Record(1, point, 8.2);
    System.out.println(list.insert(record));
    double maxDist=point.dist(point);
    //Data for the second node
    Point point1 = new Point(1.4, 9.2);
    Record record1 = new Record(2, point1, 7.5);
    if((point1.dist(point)>maxDist)) maxDist=point1.dist(point);
    System.out.println(list.insert(record1));
    //Data for the third node
    Point point2 = new Point(2.2, 1.2);
    Record record2 = new Record(3, point2, 6.0);
    if((point2.dist(point1)>maxDist)) maxDist=point2.dist(point1);
    System.out.println(list.insert(record2));
    list.printList(); //Prints the list
}

我得到的清单：

HEAD -> Rank[Identity Number: 1, Location at point: 5.4,3.2, Score: 8.2] -> Rank[Identity Number: 3, Location at point: 2.2,1.2, Score: 6.0] -> Rank[Identity Number: 2, Location at point: 1.4,9.2, Score: 7.5] -> null

问题来了。我需要用以下参数实现一个名为nearest的方法。

public RankList nearest (Point p,double maxDist)

注意：最近的方法在类ranklist范围内。
在这种方法中，我需要将我已经插入到ranklist的所有点与点p进行比较。
例如 Point p = ( 2.2 , 4.4) 带着所有的 Locations at point 我很难理解如何只访问ranklist中节点的point对象，以便使用它进行比较。
我试图实现这个，但它根本不起作用，因为点超出了范围。

public RankList nearest (Point p,double maxDist){
        RankList nearList = new RankList();

        Node current = first;
        while (current != null) {
            System.out.print(current);
            if(point.dist(p)<maxDist){ //Finding the distance between the added points with p argument 
                nearList.insert(record); //Insert the distances shorter than maxDist in a new list.
            }
            current = current.getNext();
        }
        System.out.println("null");
        return nearList;
        }

点类：

class Point {
    public double x, y;
    public Point(double x, double y) {
        this.x = x;
        this.y = y;
    }
    //Distance between two points
    public double dist(Point p) {
        return Math.sqrt((this.x-p.x)*(this.x-p.x)+(this.y-p.y)*(this.y-p.y));
    }

    public Point copy() {
        return new Point(this.x, this.y);
    }
    @Override
    public String toString() {
        return "point: "+x+","+y;
    }

}