Java 实现：从点类到圆类，计算圆心坐标(50,30)、半径 4 的圆周长与面积

以下是使用 Java 实现的代码： ```java class Point { int x; int y; Point(int x, int y) { this.x = x; this.y = y; } } class Circle extends Point { int radius; Circle(int x, int y, int radius) { super(x, y); this.radius = radius; } double getPeri() { double peri = 2 * 3.14 * radius; System.out.println("圆的周长为：" + peri); return peri; } double getArea() { double area = 3.14 * radius * radius; System.out.println("圆的面积为：" + area); return area; } } public class MainClass { public static void main(String[] args) { Circle c = new Circle(50, 30, 4); c.getPeri(); c.getArea(); } } ``` ######[AI写代码神器 | 246点数解答 | 2024-11-11 16:36:30]