[實驗任務一]：銀行賬戶
用Java程式碼模擬實現課堂上的“銀行賬戶”的例項，要求編寫客戶端測試程式碼模擬使用者存款和取款，注意賬戶物件狀態和行為的變化。
實驗要求：
1. 畫出對應的類圖；
2. 提交原始碼；
#include<iostream>
#include<string>
using namespace std;
class Account;
//環境類
class AccountState{
public:
Account *acc;
double balance;
string stateName;
public:
virtual void stateCheck(double balance)=0;
double getBalance(){
return balance;
}
void setBalance(double balance){
this->balance=balance;
}
string getStateName(){
return stateName;
}
void setStateName(string statename){
this->stateName=statename;
}
void deposit(double amount);
virtual void withdraw(double amount);
};
//抽象狀態類
class Account{
private:
AccountState *state;
string name;
public:
Account(string name);
void setState(AccountState *state) {
this->state=state;
}
AccountState* getState() {
return this->state;
}
string getName() {
return this->name;
}
void deposit(double amount) {
state->deposit(amount);
}
void withdraw(double amount) {
state->withdraw(amount);
}
};
//具體狀態類
class RedState :public AccountState{
public:
RedState(AccountState *state) {
this->balance = state->balance;
this->acc = state->acc;
this->stateName="透支狀態";
}
void withdraw(double amount){
cout<<"對不起，"<<acc->getName()<<"，您不能取款！"<<endl;
cout<<"當前餘額："<<balance<<"元，當前狀態："<<acc->getState()->stateName<<endl;
}
void stateCheck(double balance);
};
class YellowState :public AccountState{
public:
YellowState(AccountState *state) {
this->balance = state->balance;
this->acc = state->acc;
this->stateName="欠費狀態";
}
void stateCheck(double balance);
};
//具體狀態類
class GreenState:public AccountState{
public:
GreenState(Account *acc) {
this->balance = balance;
this->acc = acc;
this->stateName="正常狀態";
}
GreenState(AccountState *state) {
this->acc=state->acc;
this->balance=state->balance;
this->stateName="正常狀態";
}
void stateCheck(double balance) {
if(balance>=-1000&&balance<0) {
acc->setState(new YellowState(this));
}else if(balance<-1000) {
acc->setState(new RedState(this));
}
else{
acc->setState(new GreenState(this));
}
}
};
//具體狀態類
void RedState::stateCheck(double balance){
if(balance>=-1000&&balance<0) {
acc->setState(new YellowState(this));
}else if(balance<-1000) {
acc->setState(new RedState(this));
}
else {
acc->setState(new GreenState(this));
}
}
void YellowState::stateCheck(double balance) {
if(balance>=-1000&&balance<0) {
acc->setState(new YellowState(this));
}else if(balance<-1000) {
acc->setState(new RedState(this));
}
else{
acc->setState(new GreenState(this));
}
}
Account::Account(string owner){
this->name=owner;
this->state=new GreenState(this);
cout<<"恭喜"<<owner<<"開戶成功！初始金額：0元"<<endl;
cout<<"**************************************"<<endl;
}
void AccountState::deposit(double amount){
cout<<this->acc->getName()<<"存款"<<amount<<"元"<<endl;
balance+=amount;
stateCheck(balance);
cout<<"當前餘額："<<balance<<"元，當前狀態："<<acc->getState()->stateName<<endl;
}
void AccountState::withdraw(double amount){
cout<<acc->getName()<<"取款"<<amount<<"元"<<endl;
balance-=amount;
stateCheck(balance);
cout<<"當前餘額："<<balance<<"元，當前狀態："<<acc->getState()->stateName<<endl;
}
int main(){
Account *account=new Account("安安");
account->deposit(2000);
cout<<"-------------------------------------"<<endl;
account->withdraw(500);
cout<<"-------------------------------------"<<endl;
account->withdraw(2000);
cout<<"-------------------------------------"<<endl;
account->withdraw(600);
cout<<"-------------------------------------"<<endl;
account->withdraw(200);
return 0;
}
3. 注意程式設計規範。