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羞，Java 字符串拼接竟然有这么多姿势
source link: https://juejin.im/post/5dcc76bde51d45109d6df4b4
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二哥，我今年大二，看你分享的《阿里巴巴 Java 开发手册》上有一段内容说：“循环体内，拼接字符串最好使用 StringBuilder 的 append 方法，而不是 + 号操作符。”到底为什么啊，我平常一直就用的‘+’号操作符啊！二哥有空的时候能否写一篇文章
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