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来源：互联网发布：java void方法结束编辑：程序博客网时间：2024/05/20 00:36

1. 编写一个java程序，包含一个父类Telephone和一个子类Mobilephone，父类中的属性包括电话品牌、电话号码、通话时间、费率，子类中的属性包括父类中的所有属性和网络类型、被叫时间。同时对两者都计算出话费。

//Inheritance.java
// Telephone 类
class Telephone {

String brand, number;   //电话品牌：brand；电话号码：number
double dialledTime;     //通话时间
double rate;            //费率

Telephone(String b, String n) {
   brand=b;
  number=n;
   //电话品牌：brand；电话号码：number
}

String getBrand( ) {
   return brand;
}
String getNumber( ) {
   return number;
}
double getRate( ) {
   return rate;
} //返回费率值
double getDialledTime( ) {
   return dialledTime;
}

void setBrand(String b) {
    brand = b;
}
void setNumber(String n) {
    number = n; // 设置电话号码
}
void setRate(double r) {
    rate = r;
}

void setDialledTime(double d) {
dialledTime = d;
}

double callCost( ) {

   return dialledTime * rate;    // dialledTime * rate;
}    // 计算话费

void display( ) {
System.out.println("电话品牌: "+ brand +" 电话号码: "+ number);
    System.out.println("通话时间: "+ dialledTime +" 费率: "+ rate);
    System.out.println("话费: "+ callCost());
}
}

// Mobilephone类
class Mobilephone extends Telephone {
String network; //网络
double receivedTime; //被叫时间

Mobilephone(String b, String num, String net) {
super(b,num); //父类构造方法
network = net;
}

String getNetwork( ) {
   return network;
}
double getReceivedTime( ) {
   return receivedTime;
}
void setNetwork(String n) {
    network = n;
}

void setReceivedTime(double d) {
receivedTime = d; //设置被叫时间
}

double callCost( ) {
return (dialledTime + 0.5*receivedTime) * rate;
} //计算话费

void display( ) {

System.out.println("电话品牌: "+ brand +" 电话号码: "+ number
+" 网络: "+ network);

System.out.println("主叫时间: "+ dialledTime +" 被叫时间: " +
receivedTime +" 费率: "+ rate);

System.out.println("话费: "+ callCost( ));
}
}

public class Inheritance {

public static void main(String[] args) {

Telephone tel;
Mobilephone mobile;

tel = new Telephone("TCL","8309600"); // 两个参数："TCL"和"8309600"
mobile = new Mobilephone("Nokia", "13007091010","CDMA");//三个参数："Nokia", "13007091010","CDMA"

tel.setRate(0.2);
tel.setDialledTime(150);

mobile.setRate(0.4);
mobile.setReceivedTime(80); //设置主叫时间为80
mobile.setReceivedTime(120);

tel.display( );
System.out.println( );
mobile.display(); //显示移动电话的信息

}
}
实验结果：

电话品牌: TCL 电话号码: 8309600
通话时间: 150.0 费率: 0.2
话费: 30.0

电话品牌: Nokia 电话号码: 13007091010 网络: CDMA
主叫时间: 0.0 被叫时间: 120.0 费率: 0.4
话费: 24.0

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