Java核心类
廖雪峰
资深软件开发工程师，业余马拉松选手。
本节我们将介绍Java的核心类，包括：
字符串
StringBuilder
StringJoiner
包装类型
JavaBean
枚举
常用工具类
模块
字符串和编码
${user_name} @ ${created_at} ${delete_action}
${content}
${comment_replies}
${comment_action}
${comment_reply_form}
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