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车的轮胎数 重量
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 zuoye;public class Vehicle { private int wheels; private double weight; Vehicle() { weight=1;wheels=4; } Vehicle(int geshu, double chezhong) { wheels=geshu; weight=chezhong; } public int getWheels() { return wheels; } public void setWheels(int wheels) { this.wheels = wheels; } public double getWeight() { return weight; } public void setWeight(double weight) { this.weight = weight; } public void shuchu(){ System.out.println("轮子"+wheels+"个，"+"车重"+weight); }}
{ private int loader; Car1() { loader=4; } Car1(int zaike) { loader=zaike; } Car1(int geshu, double chezhong,int zaike) { super(geshu,chezhong); loader=zaike; } public void showData(){ System.out.println("轮子"+getWheels()+"个"+"自重"+getWeight()); System.out.println("载客人数："+loader+"人"); } public int getLoader() { return loader; } public void setLoader(int loader) { this.loader = loader; }}
package zuoye;public class Truck extends Car1{ private double payload; Truck() { payload=500; } Truck(double zaizhong) { payload=zaizhong; } Truck(int zaike,double zaizhong) { super(zaike); payload=zaizhong; } Truck(int lun, double chezhong,int zaike,double zaizhong) { super(lun,chezhong,zaike); payload=zaizhong; } public void showData(){ System.out.println("轮子"+getWheels()+"个"+"自重"+getWeight()); System.out.println("载客人数："+getLoader()+"人"); System.out.println("载重："+payload); }}
package zuoye;public class ceshi2 { public static void main(String[] args) { Truck t=new Truck(); t.showData(); t=new Truck(500); t.showData(); t=new Truck(20,500); t.showData(); t=new Truck(20,21,22,500); t.showData(); }}
车的轮胎数 重量
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