摘要:
实验内容: 抽象类: ~~~ package exercise; public abstract class Shape { public abstract double getArea(); } ~~~ 三角形: ~~~ package exercise; public class Delta e 阅读全文
摘要:
实验内容: 父类: ~~~ package inherit; public class Circle { double rdaius; public Circle() { } public Circle(double r) { rdaius = r; } public double getRdaiu 阅读全文