The result is that the length and index match, and you have accepted invalid input.
结果是，长度和索引相匹配，接受了无效输入。
The index position of the character in the input buffer.
该字符在输入缓冲区中的索引位置。
The index of the next character to read from the input stream buffer.
要从输入流缓冲读取的下一个字符的下标。
The index value of the input method in the collection.
集合中的输入法的索引值。
The index value of the input method in the collection.
集合中的输入法的索引值。
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