switch.java~3~

来自「《深入浅出设计模式》的完整源代码」· JAVA~3~ 代码 · 共 15 行

package testcommand;
public class Switch {
  private Command UpCommand, DownCommand;
  public Switch (Command Up, Command Down) {
    UpCommand = Up; // concrete Command registers itself with the invoker
    DownCommand = Down;
  }
  void flipUp () { // invoker calls back concrete Command, which executes the Command on the receiver
    UpCommand.execute ();

  }
  void flipDown () {
    DownCommand.execute ();
  }
}