Java设计模式之命令模式详解

// 定义命令接口
public interface Command {
    void execute();
}
// 具体命令类
public class ConcreteCommand implements Command {
    private Receiver receiver;
    public ConcreteCommand(Receiver receiver) {
        this.receiver = receiver;
    }
    @Override
    public void execute() {
        // 调用接收者的操作
        receiver.action();
    }
}
// 调用者类
public class Invoker {
    private Command command;
    public void setCommand(Command command) {
        this.command = command;
    }
    public void executeCommand() {
        // 调用命令执行请求
        command.execute();
    }
}
// 接收者类
public class Receiver {
    public void action() {
        // 具体操作的实现
        System.out.println("Receiver is performing the action.");
    }
}

// 创建命令对象
Command command = new ConcreteCommand(new Receiver());
// 创建调用者
Invoker invoker = new Invoker();
invoker.setCommand(command);
// 执行命令
invoker.executeCommand();