Java?? ????? ????? ??
Java?? ????? ????? ??? ?? ????? ? ?? ???? ???? ???? ???? ????. ? ????? ???? ??? ???? ??? ??? ?? ????? ???? ????? ???. ????? ??? ??? ?? ??? ? ????.
Nov 20, 2019 pm 05:15 PM
Java?? ??? ??? SQL ?? ?? ???
Java?? SQL ?? ??? ? ??? ???? ??? DriverManage? UTF-8 ??? ??? ???? ??? ? ????. ??? ??? ????? ??? ??? ???? ??? ? ????.
Nov 20, 2019 pm 05:05 PM
Java?? if ?? ?????? ???? ??
Java?? if ?? ????? ???? ??? ??? ????. ?? break? ???? ?? ???? ??? ? ??? ?? ??? ?? ?? ????? ??? ?? ????. ?? ??? ?? ????? ???? ????? ????.
Nov 20, 2019 pm 05:04 PM
Java? ??? ??? ?????.
Java? ??? ??? ? ??? ??? ?? ???: ?? writeFile ???? ??? ?? ??? ??? ??? ??? ???? ????? OutputStreamWriter? ?? ??? ?????.
Nov 20, 2019 pm 05:03 PM
Java?? ??? ????? ??
Java? ?? ??? ????? ??? ????. ?? ???? ???? ???? ?? ??? ???? ?? ???? ??? ???? ???? ?? ??? ??????.
Nov 20, 2019 pm 04:33 PM
Java? ???? ????? ???? ??? ??????
Java? ???? ????? ???? ??: 1. JdbcTemplate ??? ???? ???? ????? ?????. 2. ???? ????? ???? ?? ?? ??? ???? ???? ?????.
Nov 20, 2019 pm 04:27 PM
Java? ???? ??? ?????.
Java??? isDirectory()? ???? ???? ??? ??? ? ????. isDirectory()? ??? ???? ?????. ?? ?? ?? ?????. ???? true? ????, ??? ??? false? ?????.
Nov 20, 2019 pm 03:58 PM
Java? ???? ???? ?????.
Java?? ???? ???? ???? ??: ?? "=="? ???? ??? ??? ? ????(?: "a==b"). ?? ?? ?? ???? ???? ?? ??? ?? ????(?: "). a.equals(b)"?? ?? ?? true? ?????.
Nov 20, 2019 pm 03:58 PM
???? ??? ???? ??
Java?? ??? ???? ??: ?? Scanner ??? ??? ?? Scanner ??? "next()" ???? ???? ???? ??? ???? ???? ????? String? "charAt(0)" ???? ???? ?????. ? ?? ??.
Nov 20, 2019 pm 03:46 PM
txt ??? ??? ?? Java ???
Java?? ??? txt ??? ?? ?? ??: 1. Java ???? ? txt ??? ???? utf-8? ?????. 2. InputStreamReader(new FileInputStream(fileUrl), "utf-8") ???? ???? txt ??? ???? ???? ?????. UTF-8 .
Nov 20, 2019 pm 03:43 PM
Java?? ???? ???? ??
Java?? ???? ???? ??: 1. ??? "[0-9]*"? ???? ?????. 2. Java? ?? ???? isNumeric() ??? ???? ?????. 3. ASCII ?? ??? ?????.
Nov 20, 2019 pm 03:31 PM
Java?? if ?? ???? ??
Java?? if ?? ?? ??? ??? ????. 1. "if (?? ?? ???) {...}" 2. "if (??) {...}else{...}"; (??){...}else if (??){...}else{...}".
Nov 20, 2019 pm 03:29 PM
Java? ??? ???? ??? ?????.
Java? ???? ???? ??? ???? ???? ???? ??? ???? ??? ??? ? ????. Java? ???? "[\u4e00-\u9fa5]"???.
Nov 20, 2019 pm 03:06 PM
Java?? ?? ??? ???? ??
Java ?? ??? ???? ??: 1. "c:/desktop.txt"? ?? ??? ????? ???? ??????. 2. "d:\\? ?? ??????? ?? ??? ????? ????? ??????. ????.txt".
Nov 20, 2019 pm 02:53 PM
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