JAVA使用抽象类改进面向对象编程测试------JAVA入门基础教程

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package test1;

public class Circle extends GeometricObject
{
    private double radius;
    public Circle(String color,double weight,double radius)
    {
        super(color,weight);
        this.radius = radius;
    }
    public double getRadius() {
        return radius;
    }
    public void setRadius(double radius)
    {
        this.radius = radius;
    }
    public void CircleRound()
    {
        System.out.println("圆");
    }
    @Override
    public double findArea()
    {
        return 3.14 * 3.14 * radius;
    }
    public boolean equals(Object o)
    {
        if(this == o)
        {
            return true;
        }
        if(o instanceof Circle)
        {
            Circle c = (Circle)o;
            return this.radius == c.radius;
        }
        return false;
    }
}

package test1;

public abstract class GeometricObject
{
    protected String color;
    protected double weight;
    protected GeometricObject(String color,double weight)
    {
        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 abstract double findArea();
}

package test1;

public class GeoTest
{
    public static void main(String[] args)
    {
        GeoTest T = new GeoTest();
        Circle c0 = new Circle("red",1.0,2.3);
        Circle c1 = new Circle("red",1.0,3.2);
        T.displayGeometricObject(c0);
        T.displayGeometricObject(c1);
        System.out.println(T.equalArea(c0,c1));
    }
    public boolean equalArea(GeometricObject g1,GeometricObject g2)
    {
        return g1.findArea() == g2.findArea();
    }
    public void displayGeometricObject(GeometricObject g)
    {
        System.out.println(g.findArea());
        if(g instanceof Circle)
        {
            Circle c = (Circle)g;
            c.CircleRound();
        }
        if(g instanceof MyRectangle)
        {
            MyRectangle r = (MyRectangle)g;
            r.Rectangle();
        }
    }
}

package test1;

public class MyRectangle extends GeometricObject
{
    private double width;
    private double height;
    public MyRectangle(String color,double height,double weight, double width) {
        super(color, weight);
        this.width = width;
        this.height = height;
    }
    public double getWidth()
    {
        return width;
    }
    public void setWidth(double width)
    {
        this.width = width;
    }
    public void Rectangle()
    {
        System.out.println("三角形");
    }
    @Override
    public double findArea()
    {
        return width * height;
    }
}

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