Java类继承与多态实践：Vehicle、Car、Bus等六个类的构建与测试

java编程类的继承及多态

总共有六个类：Vehicle.java（汽车类）、Car.java（汽车类）、Bus.java（总线类）、Engine.java（引擎类）、VehicleFactory.java（汽车工厂））和VehicleTest.java（Test类），具体符号如下：***************************************************************总结classVehicle{Engineengine;doublespeed;doublemileage;publicVehicle(){}publicVehicle(Engineengine){this.engine=engine;}publicVehicle(Engineengine,doublemileage){this.engine=engine;this.mileage=mileage;}publicVehicle(Engineengine,doublespeed,doublemileage){this.engine=engine;this.speed=speed;this.mileage=mileage;}publicEnginegetEngine(){returnengine;}publicvoidsetEngine(Engineengine){this.engine=engine;}publicdoublegetSpeed(){returnspeed;}publicvoidsetSpeed(doublespeed){this.speed=speed;}publicdoublegetMileage(){returnmileage;}publicvoidsetMileage(doublemileage){this.mileage=里程;}publicdoubledrive(){this.setMileage(速度*(Math.round(Math.random()*6))+里程);returnmileage;}publicabstractdoublecalGC();publicStringtoString(){return"类型："+this.getClass().getName()+",马力:"+engine.horsepower+",速度:"+速度+",里程:"+里程+",油耗："+calGC();}}**********************************************************************publicclassCarextendsVehicle{publicCar()({}公共汽车)引擎){this.engine=engine;}publicCar(Engine,doublemileage){this.engine=engine;this.mileage=mileage;}publicCar(Engineengine,doublespeed,doublemileage){this.engine=engine;this.speed=speed;this.mileage=里程;}publicdoublecalGC(){returnmileage*2;}}***********************************************************************publicclassBusextendsVehicle{publicBus(){}publicBus(Engineengine){this.engine=engine;}publicBus(Engineengine,doublemileage){this.engine=engine;this.mileage=mileage;}publicBus(Engineengine,doublespeed,doublemileage){this.engine=engine;this.speed=speed;this.mileage=里程;}publicdoublecalGC(){returnmileage*3+20;}}*******************************************************************************publicclassEngine{doublehorsepower;publicEngine(){this.horsepower=1;}publicEngine(doublehorsepower){this.horsepower=马力;}publicdoublegetHorsepower(){returnhorsepower;}publicvoidsetHorsepower(doublehorsepower){this.horsepower=马力;}}****************************************************************公共类VehicleFactory{publicstaticVehiclemakeVehicle(Enginee){if((1<=e.getHorsepower())&&e.getHorsepower()<=50){returnnewCar(e,0);}elseif((50Enginee2=newEngine(88);Vehiclev2=VehicleeFactory.makeVehicle(e2);v2.setSpeed(88);v2.drive();v2.drive();System.out.println("第二辆车：");System.out.println(v2);*****************************************************************运行结果如下：第一辆车：类型：C，功率：28.0，速度：50.0，行驶距离：200.0，油耗：400.0第二辆车：类型：巴士，马力：88.0，速度：88.0，行驶距离：616.0，耗气量：1868.0************************************************************************************************************************************************************************************

JAVA编程：设计一个概念类“汽车”具有属性，类别，颜色，发动机，要求具有能设置类别属性的方法。

publicclassCar{Stringtype;Stringcolor;Stringengine;publicstaticvoidmain(String[]args){Caraodi=newCar();aodi.setColor("red");aodi.setType("A6");System.out.println("汽车类型:"+aodi.getType()+"汽车颜色颜色："+aodi.getColor());}publicStringgetColor(){returncolor;}publicvoidsetColor(Stringcolor){this.color=color;}publicvoidsetType(Stringtype){this.type=type;}publicStringgetType(){returntype;}}

一道JAVA编程题:用类描述汽车中Engine(发动机)的功率和Gearbox（变速箱）的档位数目

--------引擎类------------publicclassEngine{intpower;publicintgetPower(){returnpower;}publicvoidsetPower(intpower){this.power=power;}}----------Gearbox类----------publicclassGearbox{intamount;publicintgetAmount(){returnamount;}publicvoidsetAmount(intamount){this.amount=amount;}}-----------细胞类型电机--------------publicclassCar{Engineengine=newEngine();Gearboxgearbox=newGearbox();publicEnginegetEngine(){returnengine;}publicvoidetEngine(Enginec){this.engine=c;}publicGearboxgetGearbox(){returngearbox;}publicvoidetGearbox(Gearboxh){this.gearbox=h;}publicvoidshow(){intpower=engine.getPower();intamount=gearbox.getAmount();System.out.println("功率为："+power+"变速箱:"+金额);}}--------------------测试课-----公开课t{publicstaticvoidmain(String[]args){Engineengine=newEngine();engine.setPower(123);Gearboxgearbox=newGearbox();gearbox.setAmount(6);Carjeep=newCar();jeep.setEngine(engine);jeep.setGearbox(gearbox);jeep.show();}}这种问题太无聊了……看来你是个初学者。
我再次在线等待帮助您。