[1.List轉換成為數組。(這里的List是實體是ArrayList) 　　調用ArrayList的toArray方法。　　toArray　　public T[] toArray(T[] a)返回一個按照正確的順序包含此列表中

INCLUDE_DIRECTORIES: Add include directories to the build.[??????????? 最近在學習Linux下的C編程，買了一本叫《Linux環境下的C編程指南》讀到makefile就越看越迷糊，可能是我的理解能不行。??????????? 于是google到了以下這篇文

INCLUDE_DIRECTORIES([AFTER|BEFORE] [SYSTEM] dir1 dir2 ...)

Add the given directories to those searched by the compiler for include files. By default the directories are appended onto the current list of directories. This default behavior can be changed by setting CMAKE_INCLUDE_DIRECTORIES_BEFORE to ON. By using BEFORE or AFTER you can select between appending and prepending, independent from the default. If the SYSTEM option is given the compiler will be told that the directories are meant as system include directories on some platforms.[一般報java.lang.NullPointerException的原因有以下幾種： ·字符串變量未初始化； ·接口類型的對象沒有用具體的類初始化，比如： List lt; 會報錯 List lt = new ArrayL

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