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。
public class Phone {
private String phoneCode; //电话号码
private String answerPhone; //接电话
private String call; //打电话
public Phone() {
super();
}
public Phone(String phoneCode, String answerPhone, String call) {
super();
this.phoneCode = phoneCode;
this.answerPhone = answerPhone;
this.call = call;
}
public String getPhoneCode() {
return phoneCode;
}
public void setPhoneCode(String phoneCode) {
this.phoneCode = phoneCode;
}
public String getAnswerPhone() {
return answerPhone;
}
public void setAnswerPhone(String answerPhone) {
this.answerPhone = answerPhone;
}
public String getCall() {
return call;
}
public void setCall(String call) {
this.call = call;
}
public void phoneType(){
System.out.println("这是电话");
}
}
public interface Moveable {
public void way(); //移动方式
}
public class Mobilephone extends Phone implements Moveable {
private String mp3; //带mp3
public Mobilephone() {
super();
}
public Mobilephone(String phoneCode, String answerPhone, String call,String mp3) {
super(phoneCode,answerPhone,call); //调用父类代参的构造方法
this.mp3 = mp3;
}
public String getMp3() {
return mp3;
}
public void setMp3(String mp3) {
this.mp3 = mp3;
}
public void way() {
System.out.println("这是可移动的Mobilephone");
}
}
public class Fixedphone extends Phone {
private String leaveWord; //留言
public String getLeaveWord() {
return leaveWord;
}
public void setLeaveWord(String leaveWord) {
this.leaveWord = leaveWord;
}
public Fixedphone() {
super();
}
public Fixedphone(String leaveWord) {
super(); //调用父类无参的构造方法
this.leaveWord = leaveWord;
}
public void phoneType(){
System.out.println("这是固定电话");
}
}
public class Cordlessphone extends Phone {
private String dect; //数字无绳电话
public Cordlessphone() {
super();
}
public Cordlessphone(String dect) {
super();
this.dect = dect;
}
public String getDect() {
return dect;
}
public void setDect(String dect) {
this.dect = dect;
}
public void phoneType(){
System.out.println("这是无绳电话");
}
}
public class TestPhone {
public static void main(String[] args) {
Phone[] phones = new Phone[5];
Phone phone1 = new Phone("4213264","使用phone1接电话","使用phone1打电话");
Phone phone2 = new Phone("3413436","使用phone1接电话","使用phone1打电话");
Phone mobilephone = new Mobilephone("13254742215","使用mobilephone接电话","使用mobilephone打电话","收听mp3");
Phone fixedphone = new Fixedphone("这是固定电话fixedphone");
Phone cordlessphone = new Cordlessphone("这是无绳电话cordlessphone");
phones[0] = phone1;
phones[1] = phone2;
phones[2] = mobilephone;
phones[3] = fixedphone;
phones[4] = cordlessphone;
for(int i=0;i<phones.length; i++){
if(i!=3||i!=4)
System.out.println("这是电话的一个变量值:"+phones[i].getCall());
if(i==3)
System.out.println("这是电话的一个变量值:"+((Fixedphone)phones[i]).getLeaveWord());
if(i==4)
System.out.println("这是电话的一个变量值:"+((Cordlessphone)phones[i]).getDect());
phones[i].phoneType();
}
}
}