By convention, Java type names usually start with an uppercase letter
Eclipse在，在新建class的時候，上方黃色警告，如圖： uppercase：大寫字母 如果能看到英文，就可以很快的知道這句黃色警告的意思，翻譯過來是：類的名字不被支持，按照慣例，java類的名字通常以大寫字母開頭。 java類的名字首字母要大寫 這裏把Name改爲HelloWordActivity即可
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