Java面向对象练习(2) (2024.7.11)

圆类

java 复制代码
package area20240711;

public class Circle extends Picture{
    private double r;
    private final double PI = 3.1415926;

    public Circle(){}

    public Circle(double r) {
        this.r = r;
    }

    public double getR() {
        return r;
    }

    public void setR(double r) {
        this.r = r;
    }

    public double getPI() {
        return PI;
    }

    @Override
    public double length() {
        return 2 * PI * this.r;
    }

    @Override
    public double area() {
        return this.r * this.r * PI;
    }
}

图形类

java 复制代码
package area20240711;

public abstract class Picture {
    public abstract double length();
    public abstract double area();
}

矩形类

java 复制代码
package area20240711;

public class Rectangle extends Picture{
    private double length;
    private double width;

    public Rectangle(){}

    public Rectangle(double length, double width) {
        this.length = length;
        this.width = width;
    }

    public double getLength() {
        return length;
    }

    public void setLength(double length) {
        this.length = length;
    }

    public double getWidth() {
        return width;
    }

    public void setWidth(double width) {
        this.width = width;
    }

    @Override
    public double length() {
        return 2.0 * (this.length + this.width);
    }

    @Override
    public double area() {
        return this.length * this.width * 1.0;
    }
}

测试

java 复制代码
package area20240711;
import java.util.Scanner;
public class AreaTest {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        // 创建一个矩形
        Rectangle rtg = creatRectangle();
        System.out.println("长为" + rtg.getLength() + "宽为" + rtg.getWidth()
        + "的矩形的周长是" + rtg.length());
        System.out.println("长为" + rtg.getLength() + "宽为" + rtg.getWidth()
        + "的矩形的面积是" + rtg.area());

        // 创建一个圆形
        Circle c = creatCircle();
        System.out.println("半径为" + c.getR() + "圆的周长是" + c.length());
        System.out.println("半径为" + c.getR() + "圆的面积是" + c.area());


    }

    public static Rectangle creatRectangle () {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入矩形的长");
        double length = sc.nextDouble();
        System.out.println("请输入矩形的宽");
        double width = sc.nextDouble();
        return new Rectangle(length, width);
    }

    public static Circle creatCircle() {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入圆形的半径");
        double r = sc.nextDouble();
        return new Circle(r);
    }
}
相关推荐
程序无bug15 分钟前
手写Spring框架
java·后端
程序无bug17 分钟前
Spring 面向切面编程AOP 详细讲解
java·前端
全干engineer29 分钟前
Spring Boot 实现主表+明细表 Excel 导出(EasyPOI 实战)
java·spring boot·后端·excel·easypoi·excel导出
Fireworkitte38 分钟前
Java 中导出包含多个 Sheet 的 Excel 文件
java·开发语言·excel
GodKeyNet1 小时前
设计模式-责任链模式
java·设计模式·责任链模式
a_Dragon11 小时前
Spring Boot多环境开发-Profiles
java·spring boot·后端·intellij-idea
泽02021 小时前
C++之红黑树认识与实现
java·c++·rpc
ChinaRainbowSea1 小时前
补充:问题:CORS ,前后端访问跨域问题
java·spring boot·后端·spring
KiddoStone2 小时前
多实例schedule job同步数据流的数据一致性设计和实现方案
java
岁忧2 小时前
(LeetCode 每日一题) 1865. 找出和为指定值的下标对 (哈希表)
java·c++·算法·leetcode·go·散列表