package top.qaqaq.java.P292;

public class GeometricObject {

	protected String color;
	protected double weight;

	public GeometricObject(String color, double weight) {
		super();
		this.color = color;
		this.weight = weight;
	}

	public String getColor() {
		return color;
	}

	public void setColor(String color) {
		this.color = color;
	}

	public double getWeight() {
		return weight;
	}

	public void setWeight(double weight) {
		this.weight = weight;
	}
	
	public double findArea() {
		return 0.0;
	}

}

package top.qaqaq.java.P292;

public class Circle extends GeometricObject {

	private double radius;

	public Circle(double radius, String color, double weight) {
		super(color, weight);
		this.radius = radius;
	}

	public double getRadius() {
		return radius;
	}

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

	public double findArea() {
		return 3.14 * radius * radius;
	}
}

package top.qaqaq.java.P292;

public class MyRectangle extends GeometricObject {

	private double width;
	private double height;

	public MyRectangle(double width, double height, String color, double weight) {
		super(color, weight);
		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 findArea() {
		return width * height;
	}

}

package top.qaqaq.java.P292;
/*
	定义一个测试类GeometricTest，
	编写equalsArea方法测试两个对象的面积是否相等（注意方法的参数类型，利用动态绑定技术），
	编写displayGeometricObject方法显示对象的面积（注意方法的参数类型，利用动态绑定技术）。
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 */
public class GeometricTest {

	public static void main(String[] args) {
	
		GeometricTest test = new GeometricTest();
		
		Circle c1 = new Circle(2.3, "white", 1.0);
		test.displayGeometricObject(c1);
		Circle c2 = new Circle(3.3, "white", 1.0);
		test.displayGeometricObject(c2);
		
		boolean isEquals = test.equalsArea(c1, c2);
		System.out.println("c1和c2的面积是否相等：" + isEquals);
		
		MyRectangle rect = new MyRectangle(2.1, 3.4, "red", 2.0);
		test.displayGeometricObject(rect);
	}
	
	public void displayGeometricObject(GeometricObject o) {//GeometricObject o = new Circle(...)
		
		System.out.println("面积为：" + o.findArea());
		
	}
	
	//测试两个对象的面积是否相等
	public boolean equalsArea(GeometricObject o1,GeometricObject o2) {

		return o1.findArea() == o2.findArea();
	}
}