A class is immutable if each object of that class has a fixed value upon instantiation that cannot subsequently be changed.
原来可变不可变是mutate翻译过来的 哈哈哈
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A class is immutable if each object of that class has a fixed value upon instantiation that cannot subsequently be changed.
原来可变不可变是mutate翻译过来的 哈哈哈
相关文章：