将一个请求封装为一个对象,从而使你可用不同的请求对客户进行参数化;对请求排队或记录请求日志,以及支持可撤消的操作。
package com.lyz.design.command;
/**
* Command
* @author binghe
*
*/
public abstract class Command {
protected Receiver receiver;
public Command(Receiver receiver) {
this.receiver = receiver;
}
public abstract void execute();
}
package com.lyz.design.command;
/**
* ConcreteCommand
* @author binghe
*
*/
public class CommandImpl extends Command {
public CommandImpl(Receiver receiver) {
super(receiver);
}
public void execute() {
receiver.request();
}
}
package com.lyz.design.command;
/**
* Invoker
* @author binghe
*
*/
public class Invoker {
private Command command;
public void setCommand(Command command) {
this.command = command;
}
public void execute() {
command.execute();
}
}
package com.lyz.design.command;
/**
* Receiver
* @author binghe
*
*/
public class Receiver {
public void receive() {
System.out.println("This is Receive class!");
}
}
package com.lyz.design.command;
/**
* Test
* @author binghe
*
*/
public class Test {
public static void main(String[] args) {
Receiver rec = new Receiver();
Command cmd = new CommandImpl(rec);
Invoker i = new Invoker();
i.setCommand(cmd);
i.execute();
}
}
This is Receive class!