?? ceilingfanhighcommand.java
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package headfirst.command.party;public class CeilingFanHighCommand implements Command { CeilingFan ceilingFan; int prevSpeed; public CeilingFanHighCommand(CeilingFan ceilingFan) { this.ceilingFan = ceilingFan; } public void execute() { prevSpeed = ceilingFan.getSpeed(); ceilingFan.high(); } public void undo() { switch (prevSpeed) { case CeilingFan.HIGH: ceilingFan.high(); break; case CeilingFan.MEDIUM: ceilingFan.medium(); break; case CeilingFan.LOW: ceilingFan.low(); break; default: ceilingFan.off(); break; } }}?? 快捷鍵說明
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