java - 实现类，等腰三角形

Question

我需要实现一个 Triangle 类，并且我坚持比较边的长度来确定三角形是否确实是等腰三角形。这是我到目前为止所拥有的:

public class TriangleIsosceles {

    private Point cornerA;
    private Point cornerB;
    private Point cornerC;
    private int x1;
    private int y1;
    private int x2;
    private int y2;
    private int x3;
    private int y3;

    public TriangleIsosceles(){
        cornerA = new Point(0,0);
        cornerB = new Point(10,0);
        cornerC = new Point(5,5);
    }

    public TriangleIsosceles(int x1,int y1,int x2,int y2,int x3,int y3){
        cornerA = new Point(x1,y1);
        cornerB = new Point(x2,y2);
        cornerC = new Point(x3,y3);
    }

    public String isIsosceles(String isIsosceles){
        return isIsosceles;
    }

}

我使用的Point对象是这样的:

public class Point {

    private int x;
    private int y;

    public Point(){
        this(0,0);
    }

    public Point(int x, int y){
        this.x = x;
        this.y = y;
    }
    public void setX(int x){
        this.x=x;
    }
    public void setY(int y){
        this.y=y;
    }
    public void printPoint(){
        System.out.println(x + y);
    }

    public String toString(){
        return "x = "+x+" y = "+y;
    }

}

在另一个类 (LineSegment) 中，我创建了一个方法 length() 来确定两点的距离。看起来像:

public double length() {
    double length = Math.sqrt(Math.pow(x1-x2,2) + Math.pow(y1-y2,2));
    return length;
}

如何使用此方法来帮助我在 TriangleIsosceles 类中找到三角形的长度？

我知道我需要查看是否(lenghtAB == lengthBC || lengthBC == lenghtCA || lengthAB == lengthCA)。

Answer 1

一个快速、完全有效的解决方案是使您的长度方法成为静态实用方法，即

public static double length(x1, y1, x2, y2)
{
    return Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));
}

or

public static double length(Point p1, Point p2)
{
    return Math.sqrt(Math.pow(p1.x - p2.x, 2) + Math.pow(p1.y - p2.y, 2));
}

您还可以将该方法添加到 Point 本身，即在 Point 类中添加:

public double calcDistance(Point otherPoint)
{
   return Math.sqrt(Math.pow(this.x - otherPoint.x, 2) + Math.pow(this.y - otherPoint.y, 2));
}