我们先看一下Java的帮助文档对于Object的描述: Class Object is the root of the class hierarchy. Every class has Object as a superclass. All objects, including arrays, implement the methods of this class. Object 类是类层次结构的根类.每个类都使用 Object 作为超类.所有对象(包括数组)都实现这个类的方法. 注意:描述是E…
#29．编写一个Java应用程序,设计一个汽车类Vehicle,包含的属性有车轮个数 wheels和车重weight.小车类Car是Vehicle的子类,其中包含的属性有载人数 loader.卡车类Truck是Car类的子类,其中包含的属性有载重量payload.每个 类都有构造方法和输出相关数据的方法.最后,写一个测试类来测试这些类的功 能. package hanqi; public class Vehicle { private int wheels; private int weight…
Client --------------------------------------------------- public class Client{ public static void main(String[] args){ ///1 生产引擎; BMW b = new BMW(); // Car c = new Car(b); c.testEngine(); c.e = new Lamborghini(); c.testEngine(); }} ------ car ------…
package main import "fmt" type Humaner interface { SayHi() } type Personer interface { Humaner Sing(lrc string) } type Student struct { name string id int } //实现接口的sayhi func (s *Student)SayHi() { fmt.Printf("%s sayhi\n", s.name) } fun…
