设计模式-命令行

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1.定义

命令行模式是一种高内聚的模式，将一个请求封装成一个对象，从而让你使用不同的请求把客户端参数化，对请求排队或者记录请求日志，可以提供命令的撤销和恢复功能。

2.UML

3.代码

public abstract class Receiver {    abstract void doSomething();}

public class ConcreteReceiver1 extends Receiver {    @Override    void doSomething() {    }}

public class ConcreteReceiver2 extends Receiver {        @Override    void doSomething() {    }}

public abstract class Command {    protected Receiver mReceiver;    abstract void execute();    public Command(Receiver receiver) {        mReceiver = receiver;    }}

public class ConcreteCommand1 extends Command {    public ConcreteCommand1() {        super(new ConcreteReceiver1());    }    @Override    void execute() {        mReceiver.doSomething();    }}

public class ConcreteCommand2 extends Command {    public ConcreteCommand2() {        super(new ConcreteReceiver2());    }    @Override    void execute() {        mReceiver.doSomething();    }}

public class Client {    public static void main(String[] args) {        Command command1 = new ConcreteCommand1();        command1.execute();        Command command2 = new ConcreteCommand2();        command2.execute();    }}

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