java学习记录——类和对象的练习4

（习题）编写一个java程序，设计一个汽车类Vehicle，包含的属性有车轮的个数wheels和车重weight。小汽车类Car是Vehicle的子类，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。 class Vehicle{public int wheels;public double weight;public Vehicle(int wheels,double weight){this.wheels = wheels;this.weight = weight;}public void Print1(){System.out.println("车轮个数为：" + wheels + " 个");System.out.println("车重为 ：" + weight + " 吨");}}class Car extends Vehicle{public int loader;public Car(int wheels,double weight,int loader){super(wheels,weight);this.loader = loader;}public void Print2(){System.out.println("限载人数为：" + loader + " 人");} }class Truck extends Car{public double payload;public Truck(int wheels,double weight,int loader,double payload){super(wheels,weight,loader);this.payload = payload;}public void Print3(){System.out.println("限载重量为：" + payload + " 吨");}}public class Test4_3{public static void main(String[] args){Truck t = new Truck(4,78.3,5,23.7);t.Print1();t.Print2();t.Print3();} }本人初学，如有疑问或不对之处请指出。欢迎交流。