使用Java对点列表进行排序 [英] Sorting a list of points with Java

问题描述

我有一个点对象列表，我想按某个坐标排序，比如x值。 Java是否提供了任何有用的机制，还是应该使用常见的排序算法之一？

I have a list of point objects, which I want to sort by a certain coordinate, say the x-values. Does Java provide any useful mechanisms or should I avail myself of one of the common sort algorithms?

推荐答案

是创建自定义 比较器 ，并用它来对点列表进行排序

Yes create a custom Comparator , and use it to sort list of points

class Point{
    private int x;
    private int y;

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return y;
    }

    public void setY(int y) {
        this.y = y;
    }

    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public Point() {
    }
}

---

---

List<Point> points = new ArrayList<Point>();
points.add(new Point(1, 2));
points.add(new Point(60, 50));
points.add(new Point(50, 3));
Collections.sort(points,new Comparator<Point>() {

public int compare(Point o1, Point o2) {
    return Integer.compare(o1.getX(), o2.getX());
}
});

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