//出租车类
public class Taxi{
}public class Taxi1 extends Taxi{
public static double dRent = 100;
....
}
public class Taxi2 extends Taxi{
public static double dRent = 200;
....
}
public class Taxi3 extends Taxi{
public static double dRent = 300;
....
}
//用户类
public class User{
public boolean hasVipCard;//是否有会员卡
....
}
//计算类
public class CalcPrice(){
double public doCalc(Taxi taxi,float fDay,User user){
long lDay =0;
lDay = java.lang.Math.round(fDay);//四舍五入
double dSum = taxi.dRent * fDay;
if ((user.hasVipCard) && (lday>5)){
dSum = dSum*0.9;
}
return dSum;
}
}
public class Taxi{
}public class Taxi1 extends Taxi{
public static double dRent = 100;
....
}
public class Taxi2 extends Taxi{
public static double dRent = 200;
....
}
public class Taxi3 extends Taxi{
public static double dRent = 300;
....
}
//用户类
public class User{
public boolean hasVipCard;//是否有会员卡
....
}
//计算类
public class CalcPrice(){
double public doCalc(Taxi taxi,float fDay,User user){
long lDay =0;
lDay = java.lang.Math.round(fDay);//四舍五入
double dSum = taxi.dRent * fDay;
if ((user.hasVipCard) && (lday>5)){
dSum = dSum*0.9;
}
return dSum;
}
}
abstract public class Taxi {
abstract public double getRent();}
package com.sss.taxi;
public class Taxi1 extends Taxi{
private double dRent ;
Taxi1(){
dRent = 100; }
public double getRent(){
return dRent;
}
}
package com.sss.taxi;
public class Taxi2 extends Taxi{
private double dRent ;
Taxi2(){
dRent = 200; }
public double getRent(){
return dRent;
}
}
package com.sss.taxi;
public class Taxi3 extends Taxi{
private double dRent ;
Taxi3(){
dRent = 300; }
public double getRent(){
return dRent;
}
}package com.sss.taxi;
public class User {
public boolean hasVipCard;//是否有会员卡}package com.sss.taxi;
public class CalcPrice {
public double doCalc(Taxi taxi,float fDay,User user){ long lDay =0;
lDay = java.lang.Math.round(fDay);//四舍五入
double dSum = taxi.getRent() * fDay;
if ((user.hasVipCard) && (lDay>5)){
dSum = dSum*0.9;
}
return dSum;
}
public static void main(String [] args){
CalcPrice cp = new CalcPrice();
Taxi1 taxi1 = new Taxi1();
User user = new User();
double dSum = cp.doCalc(taxi1,2,user);
System.out.println("Price is :"+dSum);
}
}
1.出租车表T_Taxi(id,rent) //编号租金
2.用户表T_User(id,isvip) //编号,是否VIP
3.租车表T_Rent(id,user_id,taxi_id,day) //编号,用户编号,出租车编号
数据类型我就不写了。