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글번호 622
작성자 heojk
작성일 2017-04-05 16:10:37
제목 미션 - 도형
내용 Shape.java
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public abstract class Shape {
 
    private String name;
 
    public Shape(String name) {
        super();
        this.name = name;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public abstract double calcArea();
}
Rectangle.java
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public class Rectangle extends Shape {
    private int width;
    private int height;
 
    public Rectangle(String name, int width, int height) {
        super(name);
        this.width = width;
        this.height = height;
    }
 
    public int getWidth() {
        return width;
    }
    public void setWidth(int width) {
        this.width = width;
    }
    public int getHeight() {
        return height;
    }
    public void setHeight(int height) {
        this.height = height;
    }
 
    public double calcArea() {
        return getWidth()*getHeight();
    }
}
Circle.java
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public class Circle extends Shape {
 
    private static final double PI = 3.141592;
    private int radius;
 
    public Circle(String name, int radius) {
        super(name);
        this.radius = radius;
    }
 
    public int getRadius() {
        return radius;
    }
 
    public void setRadius(int radius) {
        this.radius = radius;
    }
 
    public double calcArea() {
        return PI*radius*radius;
    }
}
Triangle.java
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ShapeApplication.java
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public class ShapeApplication {
 
    public static void main(String[] args) {
//      Shape myShape = new Shape();
        Circle myCircle = new Circle("동그라미", 9);
        System.out.println(myCircle.calcArea());
        Shape myShape = new Rectangle("네모", 3, 2); //polymorphic object
//      Virtual Method Invocation
        System.out.println("사각형 넓이는 " + myShape.calcArea());
        myShape = myCircle;
        System.out.println("원의 넓이는 " + myShape.calcArea());
//      Heterogeneous collection
        Shape[] shapes = new Shape[2];
        shapes[0] = myCircle;
        shapes[1] = new Rectangle("직사각형", 5, 4);
        Object[] objs = new Object[3];
        objs[0] = "Hello";
        objs[1] = myCircle;
        objs[2] = 100;
        Shape shapeObject = (Shape)objs[1];
        System.out.println(shapeObject.calcArea());
    }
}