java - 如何重写矩形类中根据周长进行比较的compareTo方法？

Question

我这里有一个矩形类，我需要重写compareTo方法，以便它根据矩形的周长进行比较。我知道我当前的 CompareTo 方法是错误的，但我不知道如何修复它。

这是代码:

public class Rectangle implements Comparable<Rectangle> {
    private double length;
    private double width;
        private double perimeter;


    public Rectangle(double l, double w){
        this.length = l;
        this.width = w;
    } 

    public  double getLength() {
        return length;
    }

    public  double getWidth(){
        return width;
    }

        public void setLength(double l){
            length= l;
        }
        public void setWidth(double w){
            width = w;
        }

    public double getPerimeter(){
        perimeter = 2*(width + length);
                return perimeter;
    }


        @Override
        public int compareTo(Rectangle other){
                String t=Double.toString(perimeter);
                String o=Double.toString(other.perimeter);
        int comp = t.compareTo(o);

               return comp;
        }

        @Override
        public String toString(){
            return "Rectangle: "+ width +" by "+ length ;
        }




}

Answer 1

试试这个

 public int compareTo(Rectangle otherRectangle) {
    return Double.compare(this.getPerimeter(), otherRectangle.getPerimeter());
}