设计模式--命令模式

达到命令的发出者和执行者之间解耦，实现请求和执行分开。

/**
* 命令模式测试类
*
* @author Kevin
* @date 2016-3-16
*/
public class CommandTest {

public static void main(String[] args) {
Receiver receiver = new Receiver();
Command command = new CommandImpl(receiver);
Invoker invoker = new Invoker(command);
invoker.action();
}
}

/**
* 命令接口
*
* @author Kevin
* @date 2016-3-16
*/
public interface Command {

/**
* 执行
*
* @author Kevin
*/
void execute();

}

/**
* 命令实现类
*
* @author Kevin
* @date 2016-3-16
*/
public class CommandImpl implements Command {

/* 接收者 */
private Receiver receiver;

public CommandImpl(Receiver receiver) {
this.receiver = receiver;
}

@Override
public void execute() {
receiver.action();
}
}

/**
* 命令调用类
*
* @author Kevin
* @date 2016-3-16
*/
public class Invoker {

/* 命令接口 */
private Command command;

public Invoker(Command command) {
this.command = command;
}

/**
* 行动
*
* @author Kevin
*/
public void action() {
command.execute();
}
}

/**
* 命令接收类
*
* @author Kevin
* @date 2016-3-16
*/
public class Receiver {

/**
* 行动
*
* @author Kevin
*/
public void action() {
System.out.println("command received!");
}
}