Constants - final static fields and occasionally final local variables - are written in all uppercase with underscores separating the words, as in MAX_CONNECTIONS.

常量—终态静态字段和临时终态本地变量—全部适用大写字母，并以下划线分隔各词，如MAX_CONNECTIONS。

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Revise the program from the last exercise in Section 6. 10 (p. 213) so that it looks only for duplicated words that start with an uppercase letter.

修改第6。10节最后一个习题的程序，使得它只寻找以大写字母开头的连续出现的单词。

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