[JAVA]Javaプログラミング11

package week001;

interface Animal
{
	public void sound();
}
class Dog implements Animal
{
	public void sound()
	{
		System.out.println("멍멍~~");
	}
}
class Duck implements Animal
{
	public void sound()
	{
		System.out.println("꽥꽥~~");
	}
}
public class AnimalDemo {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Dog d = new Dog();
		Duck c = new Duck();
		makeSound(d);
		makeSound(c);
	}
	public static void makeSound(Animal a)
	{
		a.sound();
	}
}

package week001;

public class Circle implements Shape{
	private int radius;
	public Circle(int r)
	{
		this.radius = r;
	}
	public void draw()
	{
		System.out.println("반지름이 " + radius + "인 원입니다.");
	}
	public double getArea()
	{
		double area;
		area = PI * radius * radius;
		return area;
	}
}

package week001;

public class Oval implements Shape {
	private int width, height;
	public Oval(int w, int h)
	{
		this.width = w;
		this.height = h;
	}
	public void draw()
	{
		System.out.println(width + "x" + height + "에 내접하는 타원입니다.");
	}
	public double getArea()
	{
		double area;
		area = (double)width * (double)height * PI;
		return area;
	}
}

package week001;

public class Rect implements Shape{
	private int width, height;
	public Rect(int w, int h)
	{
		this.width = w;
		this.height = h;
	}
	public void draw()
	{
		System.out.println(width + "x" + height + "크기의 사각형입니다.");
	}
	public double getArea()
	{
		double area;
		area = width * height;
		return area;
	}
}

package week001;

public interface Shape {
	final double PI = 3.14;
	void draw();
	double getArea();
	default public void redraw()
	{
		System.out.print("--- 다시 그립니다. ");
		draw();
	}
}

package week001;

public class Shapes {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Shape donut = new Circle(10);
		donut.redraw();
		System.out.println("면적은 : " + donut.getArea());
	}
}

package week001;

public class Shapes1 {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Shape [] list = new Shape[3];
		list[0] = new Circle(10);
		list[1] = new Oval(20, 30);
		list[2] = new Rect(10, 40);
		
		for(int i=0; i<list.length; i++) list[i].redraw();
		for(int i=0; i<list.length; i++) System.out.println("면적은 " + list[i].getArea());
	}
}