用JAVA编程 类与对象的基础题

Question

1、 类与对象的基础题： 1）编程实现：以电话Phone为父类（例：电话有本机号码、打电话、接电话等属性和功能，当然还有一些其它的特性），移动电话Mobilephone和固定电话Fixedphone为两个子类，并使移动电话实现接口：可移动Moveable。固定电话又有子类：无绳电话Cordlessphone。设计并定义这几个类，明确它们的继承关系，定义子类时给出子类有别于父类的新特性。 2）声明测试类：声明Phone类的数组（含5个元素），生成五个对象存入数组：其中二个Phone类的对象、一个Mobilephone类的对象、一个Fixedphone类的对象和一个Cordlessphone类的对象，打印输出每个对象的某个成员变量。将一个父类的引用指向一个子类对象，用这个塑型后的对象来调用某个方法实现多态性。

Answer 1

class Phone{
private String phonenumber;
public void setPhonenumber(String phonenumber){
this.phonenumber=phonenumber;
}
public String getPhonenumber(){
return phonenumber;
}
public void recCall(){
System.out.println("接到一个电话");
}
public void telCall(){
System.out.println("拨出一个电话");
}
}class Fixedphone extends Phone{
private String phonenumber;//号码是私有，设置为private，不可继承
public void recCall(){
System.out.println("以"+this.phonenumber+"呼出了一个电话"); //重载了父类的recCall
}
}class Cordlessphone extends Fixedphone{
private String phonenumber;
public void info(){
System.out.println("这是无绳电话的信息");
}
}interface Moveable{
public void moveinfo();
}class Mobilephone extends Phone implements Moveable{
private String phonenumber;
public void moveinfo(){
System.out.println("我实现了可移动性");
}
}public class PhoneTest{
public static void main(String a[]){
Phone[] p=new Phone[5];
Phone p1=new Phone();
p1.setPhonenumber("123456789");
p[0]=p1;
Phone p2=new Phone();
p2.setPhonenumber("987654321");
p[1]=p2;
Mobilephone mp=new Mobilephone();
mp.setPhonenumber("11111");
p[2]=mp;
Fixedphone fp=new Fixedphone();
fp.setPhonenumber("22222");
p[3]=fp;
Cordlessphone cp=new Cordlessphone();
cp.setPhonenumber("33333");
p[4]=cp;

for(int i=0;i<p.length;i++){
System.out.println(p[i].getPhonenumber());
} p[4]=p[1];
System.out.println(p[4].getPhonenumber());

}} 写的不是很好，希望对你有帮助噶

Answer 2

//电话基类
public class Phone {
protected String myNumber;
Phone(){
this.myNumber = "zongTaiNumber0000";
}
public void call()
{
System.out.println(myNumber + " is calling.....");
}
public void answer()
{
System.out.println(myNumber + " is answer......");
}

}
//移动电话
class Mobilephone extends Phone implements Moveable{
Mobilephone()
{
this.myNumber = "MobilephoneNumber";
}
public void move() {
System.out.println("i am moving.....");
}
}
//固定电话
class Fixedphone extends Phone {
Fixedphone()
{
this.myNumber = "FixedphoneNumber";
}
}
//无绳电话
class Cordlessphone extends Fixedphone {
Cordlessphone()
{
this.myNumber = "CordlessphoneNumber";
}
}
//可移动接口
interface Moveable {
public void move();
}
//测试类
class Test {
public static void main(String[] args) {
Phone[] p = new Phone[5];
Phone p1 = new Phone();
Phone p2 = new Phone();
Mobilephone p3 = new Mobilephone();
Fixedphone p4 = new Fixedphone();
Cordlessphone p5 = new Cordlessphone();
p[0] = p1;
p[1] = p2;
p[2] = p3;
p[3] = p4;
p[4] = p5;
for (int i = 0; i < p.length; i++)
{
System.out.println("this phone number is : " + p[i].myNumber);
p[i].call();
}
}
}

Answer 3

想用C#