优化 StringBuffer 与 StringBuilder 性能说明，避免歧义#2843
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fffg-o wants to merge 1 commit intoSnailclimb:mainfrom
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优化 StringBuffer 与 StringBuilder 性能说明，避免歧义#2843fffg-o wants to merge 1 commit intoSnailclimb:mainfrom
fffg-o wants to merge 1 commit intoSnailclimb:mainfrom
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原文在性能部分先说明了 StringBuffer 是在原对象上进行修改（不创建新对象）， 随后紧接着对比了 StringBuilder 与 StringBuffer 的性能差异。 这种表述容易让读者产生误解，将“是否创建新对象”与“性能差异”建立关联。 但实际上，StringBuffer 和 StringBuilder 都是在原对象上修改，两者的性能差异主要来源于线程安全机制
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原文在性能部分先说明了 StringBuffer 是在原对象上进行修改（不创建新对象），
随后紧接着对比了 StringBuilder 与 StringBuffer 的性能差异。这种表述可能会让读者将“是否创建新对象”与“性能差异”产生关联
但实际上，StringBuffer 和 StringBuilder 都是在原对象上修改，两者的性能差异主要来源于线程安全机制