java设计模式之门面模式

①UML设计：

②定义：为一个复杂的系统提供一个简单的入口，提高子系统的独立性

③示例：

/**
 * 构建子系统-cpu
 */
public class CPU{
  public void startup(){
    System.out.println("cpu startup");
}
  public void shutdown(){
    System.out.println("cpu shutdown"); 
}
}

/**
 * 构建子系统-Memory
 */
public class Memory{
  public void startup(){
    System.out.println("memory startup");
}
  public void shutdown(){
    System.out.println("memory shutdown"); 
}
}

/**
 * 构建子系统-disk
 */
public class Disk{
  public void startup(){
    System.out.println("disk startup");
}
  public void shutdown(){
    System.out.println("disk shutdown"); 
}
}

/**
 * 门面类-Computer
 */
public class Computer{
   private CPU cpu;
   private Memory memory;
   private Disk disk;
   public Computer(){
   cpu =new CPU();
   disk = new Disk();
   memory = new Memory();
   }
   public void startup(){
    cpu.startup();
    memory.startup();
    disk.startup();
    }
   public void shutdown(){
    cpu.shutdown();
    memory.shutdown();
    disk.shutdown();
    }
}

public class Client{
 public static void main(String args[]){
   Computer cp = new Computer();
   cp.startup();
   cp.shutdwon();
   }
}

来源：CSDN

作者：93_Ryan

链接：https://blog.csdn.net/zy52002520/article/details/80624603