Created
February 15, 2011 06:30
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| 变量不同种类反映出它们作用的范围不同 | |
| 类里面的不包含在方法里初始赋值的，有@@ 眼镜之称的是类变量，可以作用到方法里，方法们就能访问到 | |
| 如果没有定义@@ 的，即使不包含到方法里，方法也访问不到 | |
| 定义到方法里的，只有该方法能访问到，别的方法和类也访问不到 | |
| 最宽松的是用美金开头的全局变量，只要放到程序的任何地方，都能被访问到 | |
| （你说好不好？ 失去了控制不能保证访问受限，谁都能改，肯定容易出错） |
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