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。
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。
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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