如何减少代码中的分支语句.docx

如何减少代码中的分支语句代码中往往存在很多的分支语句：判断+执行；大量的分支语句让代码看上去很丑陋，而且容易增加代码复杂度。所以我觉得减少代码的分支语句或者隐藏分支语句是一件很有必要的事情，能够让代码变得更加清晰易读。减少分支语句，在实际的编程中遇到了一种比较好的方式Command模式减少分支语句。Command模式：将一个请求封装为一个对象，从而使你可用不同的请求对客户进行参数化。所以可以将一系列请求都封装成对象，形成一个请求集合。当需要执行一个请求的时候直接去这个集合中查找到对应的请求对象，然后执行对象的Command。下面以一个具体的例子看一下这个过程：结构如下：1命令原型interface ScenceCommand void doExecute();/CallHang命令class CallHangScenceCommand implements ScenceCommand private TelEventTreater mTreater; public CallHangScenceCommand(TelEventTreater treater) mTreater = treater; Override public void doExecute() mTreater.doHangCall(); /CallAnswer命令class CallAnswerScenceCommand implements ScenceCommand private TelEventTreater mTreater; public CallAnswerScenceCommand(TelEventTreater treater) mTreater = treater; Override public void doExecute() mTreater.doAnswerCall(); 不一一列出2命令注册abstract class ScenceCommandRegister /存储所有的命令请求集合 private HashMap mScenceCmdSet; public ScenceCommandRegister() mScenceCmdSet = new HashMap(); /命令请求注册 public void registerCommand(String name, ScenceCommand command) mScenceCmdSet.put(name, command); /命令请求查询 public ScenceCommand getCommand(String name) return mScenceCmdSet.get(name); class CallScenceCommandRegiser extends ScenceCommandRegister public CallScenceCommandRegiser(TelEventTreater treater) super();/注册所有命令registerCommand(CallInputCommandMatch.CALL_DEFAULT, new CallDefaultScenceCommand(treater); registerCommand(CallInputCommandMatch.CALL_HANG, new CallHangScenceCommand(treater); registerCommand(CallInputCommandMatch.CALL_ANSWER, new CallAnswerScenceCommand(treater); registerCommand(CallInputCommandMatch.CALL_REPLY, new CallReplyScenceCommand(treater); registerCommand(CallInputCommandMatch.CALL_MUTE, new CallMuteScenceCommand(treater); registerCommand(CallInputCommandMatch.CALL_COMPLETE, new CallCompleteScenceCommand(treater); registerCommand(CallInputCommandMatch.CALL_NORSP, new CallNoRspScenceCommand(treater); 3命令执行private static ScenceCommandRegister mScenceRegister;Overridepublic void onResult(Result res) String resultStr = res.Get_RawText();do /操作请求 String cmdStr = mCommandMatch.matchInputCommand(resultStr); if (cmdStr = null) break; /命令请求ScenceCommand scenceCmd = mScenceRegister.getCommand(cmdStr);if (scenceCmd = null) break;/命令执行scenceCmd.doExecute(); while (false);4 总结这是存在比较多的条件判断情况下，以