java抽象类聚合代码 java抽象类代码例子

java程序,抽象类实现,求具体代码

package test;

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/**

*

* @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());

}

}

求JAVA代码~~~~~~~~~~:编写一个应用抽象类的程序。

//抽象的形状类

abstract class Shape{

abstract double getArea(); //抽象的求面积方法

}

//矩形类

class Rectangle extends Shape{

protected double width;

protected double height;

public Rectangle(double width, double height){

this.width = width;

this.height = height;

}

@Override

double getArea() { //实现父类的方法

return this.width * this.height;

}

}

//椭圆类

class Ellipse extends Shape{

protected double a;

protected double b;

public Ellipse(double a, double b){

this.a = a;

this.b = b;

}

@Override

double getArea() {

return Math.PI * this.a * this.b;

}

}

public class TestAbstract {

public static void main(String[] args) {

Shape s;

s = new Rectangle(3, 4);

System.out.println("矩形的面积 : " + s.getArea());

s = new Ellipse(4, 3);

System.out.println("椭圆的面积 : " + s.getArea());

}

}

编写一个Java代码,在其中您将拥有一个带有一个抽象方法的抽象类。然后将抽象类扩展为两个具体的子类?

比较基础,给你个例子的思路:

1、创建抽象动物类:AbstractAnimal.java:public AbstractAnimal{...},其中包含属性String name;(自行设置getter和setter),包含抽象方法public void walk();

2、创建狗类Dog.java,继承抽象动物类:public Dog extends AbstractAnimal{...},同时必须重写行走方法:

@Override

public void walk(){

System.out.println(super.name + "用四条腿走路");

}

3、创建人类People.java,继承抽象动物类:public Peopleextends AbstractAnimal{...},同时必须重写行走方法:

@Override

public void walk(){

System.out.println(super.name + "用两条腿走路");

}

4、编写测试类

private static void main(String[] args){

AbstractAnimal dog = new God();

dog.setName("来福");

dog.walk();

AbstractAnimal people = new People();

people.setName("张三");

people.walk();

}


文章题目:java抽象类聚合代码 java抽象类代码例子
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