设计模式-外观模式

来源：互联网发布：南宁关键字优化公司编辑：程序博客网时间：2024/06/03 14:25

外观模式（Facade Pattern）
外观模式是软件工程中常用的一种软件设计模式。它为子系统中的一组接口提供一个统一的高层接口。这一接口使得子系统更加容易使用。

public class CPU {      public void startup(){          System.out.println("cpu startup!");      }            public void shutdown(){          System.out.println("cpu shutdown!");      }  }

public class Memory {      public void startup(){          System.out.println("memory startup!");      }            public void shutdown(){          System.out.println("memory shutdown!");      }  }

public class Disk {      public void startup(){          System.out.println("disk startup!");      }            public void shutdown(){          System.out.println("disk shutdown!");      }  }

public class Computer {      private CPU cpu;      private Memory memory;      private Disk disk;            public Computer(){          cpu = new CPU();          memory = new Memory();          disk = new Disk();      }            public void startup(){          System.out.println("start the computer!");          cpu.startup();          memory.startup();          disk.startup();          System.out.println("start computer finished!");      }            public void shutdown(){          System.out.println("begin to close the computer!");          cpu.shutdown();          memory.shutdown();          disk.shutdown();          System.out.println("computer closed!");      }  }

public class User {      public static void main(String[] args) {          Computer computer = new Computer();          computer.startup();          computer.shutdown();      }  }

start the computer!cpu startup!memory startup!disk startup!start computer finished!begin to close the computer!cpu shutdown!memory shutdown!disk shutdown!computer closed!

0 0