主題 本節(jié)主要講解泛型方法 泛型方法 泛型是反面向?qū)ο蟮囊环N性質(zhì)（anti-oop） 本質(zhì)上是abstract(請(qǐng)?jiān)试S我這里用了一個(gè)"抽取"的概...
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