StringBuffer 和 StringBuilder 类

StringBuffer和StringBuilder是Java中用于字符串操作的可变字符序列类。它们的主要区别在于StringBuffer是线程安全的，而StringBuilder是非线程安全的。

StringBuffer类和StringBuilder类都提供了一系列的方法来对字符串进行操作，包括创建、追加、插入、删除、替换、反转等操作。你可以根据需要选择使用哪个类来进行字符串操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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