Bài tập kế thừa hình tròn + hình chữ nhật - lập trình Java căn bản - Đề 2

/*
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 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package lesson06;

/**
 *
 * @author diepvan
 */
public class Main {
    public static void main(String[] args) {
        HinhChuNhat hcn = new HinhChuNhat(22f, 17f);
        HinhTron ht = new HinhTron(22.7f);
        
        //Cach 1
        double dt = hcn.tinhDienTich() + ht.tinhDienTich();
        System.out.println("Tong dien tich: " + dt);
        
        //Cach 2
        Shape[] list = new Shape[2];
        list[0] = hcn;
        list[1] = ht;
        
        dt = tinhTongDienTich(list);
        System.out.println("Tong dien tich: " + dt);
    }
    
    public static double tinhTongDienTich(Shape[] list) {
        double dt = 0;
        
        for (Shape shape : list) {
            dt += shape.tinhDienTich();
        }
        
        return dt;
    }
    
    public static class Shape {
        public Shape() {
        }
        
        public double tinhChuVi() {
            return 0;
        }
        
        public double tinhDienTich() {
            return 0;
        }
    }
    
    public static class HinhTron extends Shape {
        double radius;

        public HinhTron() {
        }

        public HinhTron(double radius) {
            this.radius = radius;
        }
        
        public double getRadius() {
            return radius;
        }

        public void setRadius(double radius) {
            this.radius = radius;
        }

        @Override
        public double tinhDienTich() {
            return Math.PI * radius * radius;
        }

        @Override
        public double tinhChuVi() {
            return 2 * Math.PI * radius;
        }
    }
    
    public static class HinhChuNhat extends Shape {
        double width;
        double height;

        public HinhChuNhat() {
        }

        public HinhChuNhat(double width, double height) {
            this.width = width;
            this.height = height;
        }

        public double getWidth() {
            return width;
        }

        public void setWidth(double width) {
            this.width = width;
        }

        public double getHeight() {
            return height;
        }

        public void setHeight(double height) {
            this.height = height;
        }

        @Override
        public double tinhChuVi() {
            return 2 * (width + height);
        }

        @Override
        public double tinhDienTich() {
            return width * height;
        }
        
    }
}