- 1.If I want to change the name of one of my methods, and it's called by your code, I've got to get you to change the call into me before I can change my name.
当我想改动我的某个方法的名字时，如果这个方法被你的代码所调用，那么我就必须先通知你，让你先把所有调用代码改过来，然后我才可以改动这个方法的名字。
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