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名师互学网 > IT > 软件开发 > 后端开发 > Java

请根据下面的类图编写抽象类GeometricObject,一般类Circle, Rectangle,其中GeometricObject的compareTo实现图形面积的比较。

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请根据下面的类图编写抽象类GeometricObject,一般类Circle, Rectangle,其中GeometricObject的compareTo实现图形面积的比较。

请根据下面的类图编写抽象类GeometricObject,一般类Circle, Rectangle,其中GeometricObject的compareTo实现图形面积的比较。编写测试类Test,创建对象Circle circle = new Circle(“red”,true,10);
Rectangle rectangle = new Rectangle(“blue”,false, 10,35);
调用compareTo方法判断,输出面积大的对象。

package chap01;

import java.util.Date;
import java.util.Scanner;

abstract class GeometricObject {
	private String color = "white";
	private boolean filled = false;
	private Date creatDate =  new Date();
	public GeometricObject() {
	}
	public GeometricObject(String color, boolean filled) {
		this.color = color;
		this.filled = filled;
	}
	public Date getCreatDate() {
		return creatDate;
	}
	public void setCreatDate(Date creatDate) {
		this.creatDate = creatDate;
	}
	public String getColor() {
		return color;
	}
	public void setColor(String color) {
		this.color = color;
	}
	public boolean getFilled() {
		return filled;
	}
	public void setFilled(boolean filled) {
		this.filled = filled;
	}
	public abstract double getArea();
	public abstract double getPerimeter();
	public abstract int compareTo(GeometricObject other);
}

class Rectangle extends GeometricObject{
	private double width = 5.0;
	private double height = 4.0;
	public Rectangle() {
		this.width = 5.0;
		this.height = 4.0;
	}
	@Override
	public String toString() {

		return "Rectangle [width=" + width + ", height=" + height +", getColor()="

				+ getColor() +  ", isFilled()=" + getFilled() +", getCreatDate()="+ getCreatDate()+", findArea()=" + getArea() +  "]";

	}
	public Rectangle(String color, boolean filled,double width, double height) {
		super();
		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;
	}
	public double getArea() {
		return width * height;
	}
	public double getPerimeter() {
		return 2 * (width + height);
	}
	public int compareTo(GeometricObject other) {
		if(getArea()>other.getArea()) {
			return 2;
		}else{
			return 0;
		}
	}
}


class Circle extends GeometricObject{
	private double radius;

	public Circle(String color, boolean filled,double radius) {
		super();
		this.radius = radius;
	}
	public double getRadius() {
		return radius;
	}
	public void setRadius(double radius) {
		this.radius = radius;
	}
	public double getArea() {
		return radius*radius*Math.PI;
	}
	@Override
	public String toString() {
		return "Circle [radius=" + radius + ", isFilled()=" + getFilled() +", getCreatDate()="+ getCreatDate()+", findArea()=" + getArea()+"]";
	}
	public double getPerimeter() {
		return 2*radius*Math.PI;
	}
	public int compareTo(GeometricObject other) {
		if(getArea()>other.getArea()) {
			return 2;
		}else{
			return 0;
		}
	}
}

public class Main{
	
	public static void main(String[] args) {
	Circle circle = new Circle("red",true,10);
	Rectangle rectangle = new Rectangle("blue",false, 10,35);
	
	if(circle.compareTo(rectangle)>1) {
		System.out.println(circle);
	}else {
		System.out.println(rectangle);
		}
	}
}
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