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=0i<p.lengthi++){
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
