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因为新的click方法重写了Button的具体实现，必须加上override关键字。
Since the new click method overrides Button's concrete implementation, the override keyword is required.
youdao
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因为新的click方法重写了Button的具体实现，必须加上override关键字。
Since the new click method overrides Button's concrete implementation, the override keyword is required.
youdao