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简单认识这三个对象https://github.com/isnd/bestJavaer/blob/master/java-basic/java-stringstringbufferstringbuilder.md#%E7%AE%80%E5%8D%95%E8%AE%A4%E8%AF%86%E8%BF%99%E4%B8%89%E4%B8%AA%E5%AF%B9%E8%B1%A1
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从设计角度理解https://github.com/isnd/bestJavaer/blob/master/java-basic/java-stringstringbufferstringbuilder.md#%E4%BB%8E%E8%AE%BE%E8%AE%A1%E8%A7%92%E5%BA%A6%E7%90%86%E8%A7%A3
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StringBuilder 和 StringBuffer 的扩容问题https://github.com/isnd/bestJavaer/blob/master/java-basic/java-stringstringbufferstringbuilder.md#stringbuilder-%E5%92%8C-stringbuffer-%E7%9A%84%E6%89%A9%E5%AE%B9%E9%97%AE%E9%A2%98
总结https://github.com/isnd/bestJavaer/blob/master/java-basic/java-stringstringbufferstringbuilder.md#%E6%80%BB%E7%BB%93
https://github.com/isnd/bestJavaer/blob/master/java-basic/java-stringstringbufferstringbuilder.md#碎碎念
https://github.com/isnd/bestJavaer/blob/master/java-basic/java-stringstringbufferstringbuilder.md#简单认识这三个对象
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