Change Vector to ArrayList #1
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Since __*ArrayList*__ isn't safe like __*Vector*__, I'm also adding `synchronized ()` at places where either of its structure's **size()** changes. Those 6 methods are: **add()**, **addDrawable()**, **remove()**, **removeDrawable()**, **clear()** and **clearDrawable()**. Of course, all loops traversing this class still needs to be synchronized externally as well; either over **get()** or **getDrawables()**. Last word: This patch is just a standalone performant refactoring. It's not obligatory for __*ControllerGroup*__'s previous patch.
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Since ArrayList isn't safe like Vector, I'm also adding
synchronized ()at places where either of its structure's size() changes.Those 6 methods are: add(), addDrawable(), remove(), removeDrawable(), clear() and clearDrawable().
Of course, all loops traversing this class still needs to be synchronized externally as well; either over get() or getDrawables().
Last word: This patch is just a standalone performant refactoring. It's not obligatory for ControllerGroup's previous patch.