java_hinhphang

// file hinhtron.java
class hinhtron extends hinh
{
    private float radius;
    public hinhtron()
    {
        super();
        System.out.print("Nhap do dai canh hv : ");
        this.radius = inp.nextFloat();
        inp.close();
    }
    public float chuvi()
    {
        return radius*4;

    }
    public float dientich()
    {
        return radius*radius;
    }

    public void show()
    {
        System.out.println("Chu vi hcn : " + chuvi());
        System.out.println("Dien tich hcn : " + dientich());
    }
}


//file hv.java
class hv extends hinh
{
    private float edge;
    public hv()
    {
        super();
        System.out.print("Nhap do dai canh hv : ");
        this.edge = inp.nextFloat();
        inp.close();
    }
    public float chuvi()
    {
        return edge*4;

    }
    public float dientich()
    {
        return edge*edge;
    }

    public void show()
    {
        System.out.println("Chu vi hcn : " + chuvi());
        System.out.println("Dien tich hcn : " + dientich());
    }
}

//file hcn.java

class hcn extends hinh
{
    private float width, heigh;
    public hcn()
    {
        super();

        System.out.print("Nhap chieu dai hcn : ");
        this.width = inp.nextFloat();
        System.out.print("Nhap chieu rong hcn : ");
        this.heigh = inp.nextFloat();
        inp.close();
    }
    public float chuvi()
    {
        return (width + heigh)*2;

    }
    public float dientich()
    {
        return width * heigh;
    }

    public void show()
    {
        System.out.println("Chu vi hcn : " + chuvi());
        System.out.println("Dien tich hcn : " + dientich());
    }
}

//file hinh.java
import java.util.Scanner;

abstract class hinh
{
    Scanner inp = new Scanner(System.in);
    abstract float chuvi();
    abstract float dientich();

}


//file main.java

class java_hinhphang
{
    public static void main(String [] agrs)
    {
        hcn cn = new hcn();
        hv v = new hv();
        hinhtron ht = new hinhtron();
        cn.show();
        v.show();
        ht.show();
    }
}