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【单选题】
String 和 StringBuffer,StringBuilder 的区别,错误的是()
A.
String 是个不可变长度的字符串
B.
StringBuffer 是个可变长度的字符串
C.
在对 String 类进行操作的时候（例如增加字符），实际上是在内存中产生了一个新的 String 对象
D.
StringBuffer 是 新创建一个对象
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