设计模式——命令模式

最新修改已更新到github

命令模式_命令也是类（命令的发起人和执行人分离）

/**
 * 命令抽象类
 * @author maikec
 * 2019/5/20
 */
public abstract class AbstractCommand {
    protected final AbstractReceiver receiver;
    public AbstractCommand(AbstractReceiver receiver){
        this.receiver = receiver;
    }
    /**
     * 命令1
     */
    public abstract void execute();
    /**
     * 命令2
     */
    public abstract void execute1();
}

/**
 * 命令执行者抽象类
 * @author maikec
 * 2019/5/20
 */
public abstract class AbstractReceiver {
    /**
     * 命令接收
     */
    public abstract void action();
}

/**
 * 命令调用抽象类
 * @author maikec
 * 2019/5/20
 */
public abstract class AbstractInvoker {
    protected final AbstractCommand command;
    public AbstractInvoker(AbstractCommand command){
        this.command = command;
    }
    /**
     * 调用命令接口
     */
    public abstract void invoke();
}

/**
 * @author maikec
 * 2019/5/20
 */
public class ConcreteCommand extends AbstractCommand {
    public ConcreteCommand(AbstractReceiver receiver) {
        super(receiver);
    }

    @Override
    public void execute() {
        System.out.println("starting command...");
        receiver.action();
        System.out.println("end command...");
    }

    @Override
    public void execute1() {
        throw new UnsupportedOperationException();
    }
}

/**
 * @author maikec
 * 2019/5/20
 */
public class ConcreteInvoker extends AbstractInvoker {
    public ConcreteInvoker(AbstractCommand command) {
        super(command);
    }

    @Override
    public void invoke() {
        System.out.println("start invoke command...");
        command.execute();
        System.out.println("end invoke command...");
    }
}

/**
 * 具体命令执行人
 * @author maikec
 * 2019/5/20
 */
public class ConcreteReceiver extends AbstractReceiver {
    @Override
    public void action() {
        System.out.println("ConcreteReceiver");
    }
}

/**
 * @author maikec
 * 2019/5/20
 */
public class CommandDemo {
    public static void main(String[] args) {
        AbstractReceiver receiver = new ConcreteReceiver();
        AbstractCommand command = new ConcreteCommand(receiver);
        AbstractInvoker invoker = new ConcreteInvoker(command);

        invoker.invoke();
    }
}

附录

github.com/maikec/patt… 个人GitHub设计模式案例

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