【java】简单继承练习

来源：互联网发布：apache cxf 2.2.8.jar 编辑：程序博客网时间：2024/05/04 05:02

package 上机3;public class test {public static void main(String[] args) {// TODO Auto-generated method stub        Bird bird=new Bird("公");        bird.shout();        Dog dog=new Dog("萨摩");        dog.shout();        Person p=new Person("张三");        p.speak();        Student stu=new Student("李四","1234567");        stu.study();}}class Animal{protected String zhonglei; //动物种类public void shout(){System.out.println("动物发出叫声");}}class Bird extends Animal{private String sex; //鸟的性别public Bird(String sex){super.zhonglei="哺乳类";this.sex=sex;}public void shout(){System.out.println("吱吱");}}class Dog extends Animal{private String pinzhong;  //狗的品种public Dog(String pinzhong){super.zhonglei="哺乳类";this.pinzhong=pinzhong;}public void shout(){System.out.println("汪汪");}}class Person extends Animal{protected String name;public Person(String name){super.zhonglei="哺乳类";this.name=name;}public void speak(){System.out.println(name+"交流");}}class Student extends Person{private  String num;  //学号 public Student(String name,String num){super(name);   //调用父类Person的构造函数this.num=num;}public void study(){System.out.println(super.name+"学习");}}

2. 建立一个汽车Auto类，包括轮胎个数，汽车颜色，车身重量、速度等成员变量。并通过不同的构造方法创建实例。至少要求：汽车能够加速，减速，停车。再定义一个小汽车类Car，继承Auto，并添加空调、CD等成员变量，覆盖加速，减速的方法

package 上机3;public class test1 {    public static void main(String[] args)    {    Auto a=new Auto(8,"蓝色",100);    a.setSpeed(30);    a.addSpeed(20);    a.subSpeed(10);    Car c=new Car(4,"白色",80,"空调","张杰专辑");    c.addSpeed(30);    c.subSpeed(10);    }}class Auto{protected int tyreNum; //轮胎个数protected String collor; //汽车颜色protected int weight;//车身重量protected int speed; //速度public Auto(int tyreNum,String collor,int weight){this.tyreNum=tyreNum;this.collor=collor;this.weight=weight;}public void setSpeed(int speed){this.speed=speed;}public void addSpeed(int num){int maxSpeed=120;    int ret=speed+num;    if(ret<=maxSpeed){    speed=ret;    System.out.println("当前车速"+speed);}    else    {    speed=maxSpeed;    System.out.println("车速已达上限，无法继续加速");    }}public void subSpeed(int num){int ret=speed-num;if(ret>0){speed=ret;System.out.println("当前车速"+speed);}else{speed=0;System.out.println("车速为0，无法继续减速");}}public void stop(){speed=0;System.out.println("车停");}}class Car extends Auto{    public Car(int tyreNum,String collor,int weight,String kongtiao,String CD)    {    super(tyreNum,collor,weight);    this.kongtiao=kongtiao;    this.CD=CD;    }        public void addSpeed(int num)    {    super.speed=num;    if(num<=130)    System.out.println("小车速度已加至"+num);    else    System.out.println("超速");    }        public void subSpeed(int num)    {    super.speed=num;    if(num>=0)    System.out.println("小车速度以减至"+num);    else    System.out.println("小车速度不能为负值");    }protected String kongtiao;protected String CD;}

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