Java设计类的题讨论一下

Question

设计Circle，Rectangle，Geometry类三个类有不同的属性，该怎么去设计 问题看简介

Answer 1

设计Circle，Rectangle，Geometry类，Circle类有属性x，y，radius。Rectangle类有左上顶点坐标（x，y），width，height。Geometry类将Circle，Rectangle类组合，设计getDistance函数返回圆与矩形中心的距离

这里计算的是圆心到矩形中心的距离，示例代码如下：

public class Cricle {

    private double x;

    private double y;

    private double radius;

    public Cricle(double x, double y, double radius) {
        this.x = x;
        this.y = y;
        this.radius = radius;
    }

    public double getX() {
        return x;
    }

    public double getY() {
        return y;
    }

    public double getRadius() {
        return radius;
    }
}

public class Rectangle {

    private double x;

    private double y;

    private double width;

    private double height;

    public Rectangle(double x, double y, double width, double height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
    }

    public double getX() {
        return x;
    }

    public double getY() {
        return y;
    }

    public double getWidth() {
        return width;
    }

    public double getHeight() {
        return height;
    }

}

public class Geometry {

    private Cricle cricle;

    private Rectangle rectangle;

    public Geometry(Cricle cricle, Rectangle rectangle) {
        this.cricle = cricle;
        this.rectangle = rectangle;
    }

    /**
     * 圆心到矩形中心的距离
     *
     * @return
     */
    public double getDistance() {
        double diffX = Math.abs(this.cricle.getX() - (this.rectangle.getX() + this.rectangle.getWidth() / 2));
        double diffY = Math.abs(this.cricle.getY() - (this.rectangle.getY() + this.rectangle.getHeight() / 2));
        // 勾股定理
        return Math.sqrt(diffX * diffX + diffY * diffY);
    }

}

测试代码如下：

public class Test {

    public static void main(String[] args) {
        Cricle cricle = new Cricle(0,0,5);
        Rectangle rectangle=new Rectangle(0,0,6,8);
        Geometry geometry=new Geometry(cricle,rectangle);
        // 5.0
        System.out.println(geometry.getDistance());
    }

}