java中怎么具体使用抽象类和接口？？？

//继承抽象类Car并实现接口Gasoline

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class MyCar extends Car implements Gasoline{

//定义一个变量模拟当前档位，如1,2,3,4,5，

public int nowShift;

//无参构造方法，默认设置相关属性

public MyCar(){

this.color=Color.red;

this.gearNum=5;

this.tiretype="BridgeStone185ST";

this.engine=(float)1598.5;

}

//自己创建车时指定相关属性

public MyCar(Color c,int gearNum,String tiretype,float engine){

this.gearNum=gearNum;

this.color=c;

this.tiretype=tiretype;

this.engine=engine;

}

public void shiftgear(){

//简单模拟循环档，每次调用时档位加1，加满后归零

nowShift++;

if(nowShift=5)

nowShift=0;

}

public void brake(){

nowShift=0;

System.out.println("正在刹车...");

}

public void aircon(){

System.out.println("冷气已经打开");

}

public void headlight(){

System.out.println("大灯打开...");

}

public void refuel(){

System.out.println("轿车燃料为："+FUEL);

}

public void equipment(){

System.out.println("轿车颜色："+color+" "+"排挡数："+gearNum+"\n"+"轮胎型号:"+tiretype+" "+"尾气排量："+engine+" "+"轿车燃料："+FUEL);

}

public static void main(String[]a){

new MyCar().equipment();

}

}

main（）方法里只测试了自定义的equitment（）方法，其他的和他一样调用，如果你需要的话、希望对你有帮助

java代码题，要能编译得出结果啊！

public abstract class Vehicle {

protected int Wheel;

protected int Weight;

public Vehicle(int wheel,int weight){

}

public abstract void Speak();

}

public interface Moveable {

double MoveSpeed();

}

public class Car extends Vehicle implements Moveable{

public Car(){

super(4,1000);

super.Weight = 1000;

super.Wheel = 4;

}

public void Speak() {

System.out.println("Car speak");

}

public double MoveSpeed() {

return 250;

}

}

public class Truck extends Vehicle implements Moveable{

public Truck() {

super(4,2000);

super.Weight = 2000;

super.Wheel = 4;

}

public void Speak() {

System.out.println("Truck speak");

}

public double MoveSpeed() {

return 450;

}

}

public class TestVehicle {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Vehicle car = new Car();

System.out.println("Wheel number: "+car.Wheel+" Weight is: "+car.Weight);

car.Speak();

Car c = (Car)car;

System.out.println("Top speed: "+c.MoveSpeed());

Vehicle truck = new Truck();

System.out.println("Wheel number: "+truck.Wheel+" Weight is: "+truck.Weight);

truck.Speak();

Truck t = (Truck)truck;

System.out.println("Top speed: "+t.MoveSpeed());

}

}

用java创建一个汽车类(Car)，为其定义两个属性：颜色和型号，为该类创建两个构造方法

如下：

public class Car {

private String brandName ; // 汽车牌子

private int color; // 颜色 0:红 1:黄 2:兰 ...

public Car( String brandName, int color ){

this.brandName = brandName;

this.color = color;

}

public void move( String direction, int meters ){

System.out.println("牌子为"+ brandName + "的汽车向"+ direction + "移动了"+meters+"米.");

}

public static void main(String[] args){

Car car = new Car( "BMW", 1 );

car.move("东北", 100 );

}

介绍

Java是一门面向对象编程语言，不仅吸收了C++语言的各种优点，还摒弃了C++里难以理解的多继承、指针等概念，因此Java语言具有功能强大和简单易用两个特征。

Java语言作为静态面向对象编程语言的代表，极好地实现了面向对象理论，允许程序员以优雅的思维方式进行复杂的编程。

java编程 抽象类： 创建一个Vehicle类并将它声明为抽象类

public abstract class Vehicle{

public String NoOfWheels();

}

public class Car extends Vehicle{

public String NoOfWheels(){

return "四轮车";

}

}

public class Motorbike extends Vehicle{

public String NoOfWheels(){

return "双轮车";

}

}

public class Test{

public static void main(String[] args){

Vehicle car =new Car();

Vehicle motorbike=new Motorbike();

System.out.println(car.NoOfWheels());

System.out.println(motorbike.NoOfWheels());

}

}

Java考试编程，小汽车定义成抽象类，成员方法定义成抽象方法，重写实现抽象方法，怎么用子类实现抽象

//file1

package com.car;

public abstract class Car {

private String name;

private String color;

public abstract String getType();

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getColor() {

return color;

}

public void setColor(String color) {

this.color = color;

} 

}

//file2

package com.car;

public class BMWCar extends Car {

private String type;

public BMWCar(String name, String color) {

setName(name);

setColor(color);

this.type="BMW";

}

@Override

public String getType() {

return type;

}

public static void main(String[] args) {

Car car = new BMWCar("baoma", "white");

System.out.println(car.getType());

}

}

java程序，抽象类实现，求具体代码

package test;

/**

*

* @author JinnL

*父类抽象类

*/

public abstract class Car {

//转弯

abstract void turn();

//启动

abstract void start();

void what(){

System.out.println("this is "+this.getClass().getSimpleName());

}

public static void main(String[] args) {

/**

* 方法入口

*/

Car[] cars ={new Bicycle(),new Automobile(),new GasAutomobile(),new DieselAutomobile()};

for (Car car : cars) {

car.start();

}

}

}

class Bicycle extends Car{

@Override

void turn() {

System.out.println("this is "+this.getClass().getSimpleName());

}

@Override

void start() {

System.out.println("this is "+this.getClass().getSimpleName());

}

void what(){

}

}

class Automobile extends Car{

@Override

void turn() {

System.out.println("this is "+this.getClass().getSimpleName());

}

@Override

void start() {

System.out.println("this is "+this.getClass().getSimpleName());

}

}

class GasAutomobile extends Automobile{

//重写start turn

@Override

void turn() {

System.out.println("this is "+this.getClass().getSimpleName());

}

@Override

void start() {

System.out.println("this is "+this.getClass().getSimpleName());

}

}

class DieselAutomobile extends Automobile{

@Override

void start() {

System.out.println("this is "+this.getClass().getSimpleName());

}

void what(){

System.out.println("this is "+this.getClass().getSimpleName());

}

}

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