11.23实验 22：状态模式

[实验任务一]：银行账户

用Java代码模拟实现课堂上的“银行账户”的实例，要求编写客户端测试代码模拟用户存款和取款，注意账户对象状态和行为的变化。

实验要求：

1. 画出对应的类图；

 

 

2. 提交源代码；

#include<iostream>

#include<string>

using namespace std;

class Account;

//环境类

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);

};

//抽象状态类

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);

    }

};

//具体状态类

class RedState :public AccountState{

public:

    RedState(AccountState *state) {

        this->balance = state->balance;

        this->acc = state->acc;

        this->stateName="透支状态";

    }

    void withdraw(double amount){

        cout<<"对不起，"<<acc->getName()<<"，您不能取款！"<<endl;

        cout<<"当前余额："<<balance<<"元，当前状态："<<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="欠费状态";

    }

    void stateCheck(double balance);

};

//具体状态类

class GreenState:public AccountState{

public:

    GreenState(Account *acc) {

        this->balance = balance;

        this->acc = acc;

        this->stateName="正常状态";

    }

    GreenState(AccountState *state) {

        this->acc=state->acc;

        this->balance=state->balance;

        this->stateName="正常状态";

    }

    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));

        }

    }

};

//具体状态类

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<<"开户成功！初始金额：0元"<<endl;

    cout<<"**************************************"<<endl;

}

void AccountState::deposit(double amount){

    cout<<this->acc->getName()<<"存款"<<amount<<"元"<<endl;

    balance+=amount;

    stateCheck(balance);

    cout<<"当前余额："<<balance<<"元，当前状态："<<acc->getState()->stateName<<endl;

}

void AccountState::withdraw(double amount){

    cout<<acc->getName()<<"取款"<<amount<<"元"<<endl;

    balance-=amount;

    stateCheck(balance);

    cout<<"当前余额："<<balance<<"元，当前状态："<<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. 注意编程规范。