软件设计-状态模式
银行账户
用Java 语言(一种计算机语言，尤用于创建网站)语言（一种计算机语言，尤用于创建网站)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。
类图
源代码
Java 语言(一种计算机语言，尤用于创建网站)语言（一种计算机语言，尤用于创建网站)
包rjsj.no22
公共类绿色状态扩展了AccountState{
公共绿色状态（双余额，帐户ACC){ 0
这个. balance=余额；
此. account=acc
this.stateName='正常状态；
}
}
包rjsj.no22
公共类红色状态扩展了AccountState{
公共状态（帐户状态){ 0
这个。平衡=状态。平衡；
这个。帐户=状态。账户；
this.stateName='透支状态；
}
公开作废提款（双倍金额){ 0
系统。出去。println(帐户。getowner())取款金额);
System.out.println('抱歉，您的账户已处于透支状态，不能取款!');
}
}
包rjsj.no22
公共类黄州扩展了AccountState{
公共黄色状态（帐户状态){ 0
这个。平衡=状态。平衡；
这个。帐户=状态。账户；
this.stateName='欠费状态；
}
}
包rjsj.no22
公共类帐户{
私人账户国家；
私有字符串所有者；
公共帐户状态GetState(){ 0
返回状态；
}
公共void setState(帐户状态状态){ 0
这个.状态=状态
}
公共字符串getOwner(){ 0
归还所有者；
}
公共无效存款（双倍金额){ 0
存款（金额);
}
公开作废提款（双倍金额){ 0
状态。提取（金额);
}
公共帐户（字符串所有者，双initBalance){ 0
this.owner=所有者；
这个。state=new GreenState(initBalance，this)；
System.out.println(this.owner)开户成功！银行卡初始金额：' initBalance)；
系统。出去。println('-')；
}
}
包rjsj.no22
公共抽象类AccountState {
受保护账户账户；//账户名
受保护的双重平衡；//账户金额
受保护的字符串状态名；//当前状态
公共无效存款（双倍金额){ 0
系统。出去。println(帐户。getowner())存款金额);
这个余额=这个余额。
状态检查()；
System.out.println('账户余额：“这个。余额)；
System.out.println('账户状态：' account.getS
tate().stateName);
}
public void withdraw(double amount) {
System.out.println(account.getOwner() + "取款" + amount);
this.balance = this.balance - amount;
stateCheck();
System.out.println("账户余额：" + this.balance);
System.out.println("账户状态：" + account.getState().stateName);
}
public void stateCheck(){//状态审查
if( balance = -1000 balance 0 ) {
account.setState(new YellowState(this));
}else if( balance -1000 ) {
account.setState(new RedState(this));
}else if ( balance 0 ){
account.setState(new GreenState(this.balance,this.account));
}
}
}
package rjsj.no22;
public class Client {
public static void main(String[] args) {
Account account = new Account("张三",100);
account.deposit(8888);
System.out.println("------------------------------");
account.withdraw(666);
System.out.println("------------------------------");
account.deposit(50);
System.out.println("------------------------------");
account.withdraw(9000);
System.out.println("------------------------------");
account.withdraw(50000);
System.out.println("------------------------------");
account.deposit(3000);
System.out.println("------------------------------");
account.withdraw(100);
}
}
C++
#includeiostream
using namespace std;
class Account;
class AccountState{
public:
Account *acc;
double balance;
string stateName;
public:
virtual void stateCheck()=0;
void deposit(double amount);
virtual void withdraw(double amount);
};
class Account{
private:
AccountState *state;
string owner;
public:
Account(string owner,double init);
void setState(AccountState *state) {
this-state=state;
}
AccountState* getState() {
return this-state;
}
string getOwner() {
return this-owner;
}
void deposit(double amount) {
state-deposit(amount);
}
void withdraw(double amount) {
state-withdraw(amount);
}
};
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"账户处于透支状态，不能取款！"endl;}
void stateCheck();
};
class YellowState :public AccountState{
public:
YellowState(AccountState *state) {
this-balance = state-balance;
this-acc = state-acc;
this-stateName="欠费状态";
}
void stateCheck();
};
class GreenState:public AccountState{
public:
GreenState(double balance,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() {
if(balance=-1000balance0) {
acc-setState(new YellowState(this));
}else if(balance-1000) {
acc-setState(new RedState(this));
}
else{
acc-setState(new GreenState(this));
}
}
};
void RedState::stateCheck(){
if(balance=-1000balance0) {
acc-setState(new YellowState(this));
}else if(balance-1000) {
acc-setState(new RedState(this));
}
else {
acc-setState(new GreenState(this));
}
}
void YellowState::stateCheck() {
if(balance=-1000balance0) {
acc-setState(new YellowState(this));
}else if(balance-1000) {
acc-setState(new RedState(this));
}
else{
acc-setState(new GreenState(this));
}
}
void AccountState::deposit(double amount){
coutacc-getOwner()"存款"amountendl;
this-balance+=amount;
stateCheck();
cout"账户余额："this-balanceendl;
cout"账户状态："acc-getState()-stateNameendl;
}
void AccountState::withdraw(double amount){
coutacc-getOwner()"取款"amountendl;
this-balance-=amount;
stateCheck();
cout"账户余额："this-balanceendl;
cout"账户状态："acc-getState()-stateNameendl;
}
Account::Account(string owner,double init){
this-owner=owner;
this-state=new GreenState(init,this);
cout"恭喜"this-owner"开户成功！银行卡初始金额："initendl;
cout"--------------------------------------------------"endl;
}
int main(){
Account *account=new Account("张三",100);
account-deposit(100);
cout"--------------------------------------------------"endl;
account-withdraw(1000);
cout"--------------------------------------------------"endl;
account-deposit(1000);
cout"--------------------------------------------------"endl;
account-withdraw(2000);
cout"--------------------------------------------------"endl;
account-withdraw(10000);
cout"--------------------------------------------------"endl;
account-withdraw(1);
cout"--------------------------------------------------"endl;
account-deposit(100000);
cout"--------------------------------------------------"endl;
return 0;
}
运行结果：
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