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添加状态模式代码
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‎src/State（状态）/README.txt‎

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-- ������˾������һ��ֽ����Ϸ�������ڸ���Ϸ�������û���ɫ�������ż�(Primary)��������(Secondary)�����ּ�(Professional)�͹ǻҼ�(Final)���ֵȼ�����ɫ�ĵȼ�����������Ӧ����Ϸʤ�������ӻ��֣�ʧ����۳����֡����ż��������������Ϸ����play() ����������������Ϸʤ�����ּӱ�����doubleScore()�����ּ��������������������ӻ��ƹ���changeCards()���ǻҼ��ڸ��ּ�������������͵�����˵��ƹ���peekCards()����ʹ��״̬ģʽ����Ƹ�ϵͳ��
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-- ״̬ģʽ��ʹ�ñ�Ȼ������ϵͳ���������ĸ�����
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-- ״̬ģʽ�Ľṹ��ʵ�ֶ���Ϊ���ӣ����ʹ�ò����ᵼ�³���ṹ�ʹ���Ļ��ҡ�

‎src/State（状态）/common.java‎

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‎src/State（状态）/common.js‎

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‎src/State（状态）/common.ts‎

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interface State {
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handle(context: Context): void;
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}
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class ConcreteStateA implements State {
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public handle(context: Context): void {
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console.log("`handle` method of ConcreteStateA is being called!");
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context.State = new ConcreteStateB();
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}
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}
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class ConcreteStateB implements State {
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public handle(context: Context): void {
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console.log("`handle` method of ConcreteStateB is being called!");
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context.State = new ConcreteStateA();
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}
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}
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class Context {
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private state: State;
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constructor(state: State) {
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this.state = state;
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}
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get State(): State {
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return this.state;
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}
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set State(state: State) {
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this.state = state;
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}
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public request(): void {
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console.log("request is being called!");
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this.state.handle(this);
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}
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}
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class Client {
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public static main(): void {
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const context: Context = new Context(
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new ConcreteStateA()
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);
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context.request();
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context.request();
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context.request();
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context.request();
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context.request();
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context.request();
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context.request();
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context.request();
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}
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}
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Client.main()
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// request is being called!
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// `handle` method of ConcreteStateA is being called!
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// request is being called!
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// `handle` method of ConcreteStateB is being called!
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// request is being called!
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// `handle` method of ConcreteStateA is being called!
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// request is being called!
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// `handle` method of ConcreteStateB is being called!
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// request is being called!
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// `handle` method of ConcreteStateA is being called!
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// request is being called!
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// `handle` method of ConcreteStateB is being called!
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// request is being called!
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// `handle` method of ConcreteStateA is being called!
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// request is being called!
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// `handle` method of ConcreteStateB is being called!

‎src/State（状态）/demo.ts‎

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// 账户有几种状态：正常，透支，受限
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// 状态抽象类
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abstract class State {
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private name: string;
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protected acc: Account;
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constructor(name: string) {
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this.name = name;
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}
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getName() {
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return this.name;
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}
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abstract deposit(amount: number);
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abstract withdraw(amount: number);
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abstract computeInterest();
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abstract stateCheck();
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}
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// 正常状态类
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class NormalState extends State {
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acc: Account;
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constructor(acc: Account) {
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super('正常');
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this.acc = acc;
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}
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deposit(amount: number) {
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this.acc.setBalance(this.acc.getBalance() + amount);
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this.stateCheck();
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}
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withdraw(amount: number) {
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this.acc.setBalance(this.acc.getBalance() - amount);
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this.stateCheck();
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}
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computeInterest() {
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console.log('正常状态，无须支付利息');
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}
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// 状态转换
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stateCheck() {
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if (this.acc.getBalance() > -2000 && this.acc.getBalance() <= 0) {
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this.acc.setState(new OverdraftState(this.acc));
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} else if (this.acc.getBalance() == -2000) {
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this.acc.setState(new RestrictedState(this.acc));
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} else if (this.acc.getBalance() < -2000) {
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console.log('操作受限');
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}
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}
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}
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// 透支状态
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class OverdraftState extends State {
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acc: Account;
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constructor(acc: Account) {
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super('透支');
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this.acc = acc;
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}
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deposit(amount: number) {
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this.acc.setBalance(this.acc.getBalance() + amount);
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this.stateCheck();
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}
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withdraw(amount: number) {
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this.acc.setBalance(this.acc.getBalance() - amount);
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this.stateCheck();
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}
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computeInterest() {
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console.log('计算利息');
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}
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// 状态转换
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stateCheck() {
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if (this.acc.getBalance() > 0) {
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this.acc.setState(new NormalState(this.acc));
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} else if (this.acc.getBalance() == -2000) {
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this.acc.setState(new RestrictedState(this.acc));
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} else if (this.acc.getBalance() < -2000) {
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console.log('操作受限');
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}
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}
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}
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// 受限状态
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class RestrictedState extends State {
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acc: Account;
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constructor(acc: Account) {
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super('受限');
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this.acc = acc;
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}
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deposit(amount: number) {
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this.acc.setBalance(this.acc.getBalance() + amount);
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this.stateCheck();
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}
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withdraw(ammount: number) {
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console.log('账号受限，取款失败');
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}
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computeInterest() {
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console.log('计算利息');
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}
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// 状态转换
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stateCheck() {
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if (this.acc.getBalance() > 0) {
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this.acc.setState(new NormalState(this.acc));
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} else if (this.acc.getBalance() > -2000) {
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this.acc.setState(new OverdraftState(this.acc));
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}
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}
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}
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// 账户类，代表状态模式中的环境
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class Account {
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private name: string;
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private state: State;
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// 余额
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private balance = 0;
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// 初始时为正常状态
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constructor(name: string) {
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this.name = name;
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this.state = new NormalState(this);
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console.log(`用户 ${this.name} 开户，余额为 ${this.balance}`);
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console.log('--------');
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}
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getBalance(): number {
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return this.balance;
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}
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setBalance(balance: number) {
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this.balance = balance;
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}
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setState(state: State) {
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this.state = state;
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}
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// 存款
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deposit(amount: number) {
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this.state.deposit(amount);
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console.log(`存款 ${amount}`);
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console.log(`余额为 ${this.balance}`);
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console.log(`账户状态为 ${this.state.getName()}`);
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console.log('--------');
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}
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// 取款
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withdraw(amount: number) {
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this.state.withdraw(amount);
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console.log(`取款 ${amount}`);
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console.log(`余额为 ${this.balance}`);
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console.log(`账户状态为 ${this.state.getName()}`);
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console.log('--------');
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}
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// 结算利息
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computeInterest() {
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this.state.computeInterest();
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}
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}
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class Client {
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public static main(): void {
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const acc = new Account('Bob');
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acc.deposit(1000);
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acc.withdraw(2000);
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acc.deposit(3000);
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acc.withdraw(4000);
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acc.withdraw(1000);
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acc.computeInterest();
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}
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}
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Client.main()
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// 用户 Bob 开户，余额为 0
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// --------
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// 存款 1000
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// 余额为 1000
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// 账户状态为 正常
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// --------
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// 取款 2000
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// 余额为 -1000
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// 账户状态为 透支
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// --------
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// 存款 3000
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// 余额为 2000
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// 账户状态为 正常
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// --------
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// 取款 4000
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// 余额为 -2000
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// 账户状态为 受限
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// --------
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// 账号受限，取款失败
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// 取款 1000
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// 余额为 -2000
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// 账户状态为 受限
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// --------
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// 计算利息

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