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Java

Java???

Java?? ???? ????? ???? ??

Java?? ???? ????? ???? ??: 1. ??? "[\u4e00-\u9fa5]"? ???? ???? ????? ?????. 2. 19968? 40869 ??? ???? ???? ???? ??? ??? ????? ?????.

Nov 22, 2019 am 09:28 AM

java

Java?? ???? ???? ???? ??

Java??? str.matches("[a-zA-Z]+") ???? ???? ???? ???? ??? ???? ? ????. match() ???? ???? ??? ?? ???? ????? ???? ? ?????.

Nov 22, 2019 am 09:17 AM

java

Java ??? ??? ??? ???? ??

Java ??? ?? ??? ?? ?? ??: 1. setCharacterEncoding ???? ???? ??? ???? ??????. 2. setContextType ???? ???? ?? ? ??? ???? ??????.

Nov 21, 2019 pm 05:04 PM

java

Java?? ??? ??? ??? ???? ??

Java? ??? ??? ????? ???? ??: 1. ??? ???? ??? ?? ??? ??? ???? ??? ????? ?????. 2. set? ???? ??? ????? ?????. 3. ??? ???? ??? ???? ??? ????? ?????.

Nov 21, 2019 pm 04:52 PM

java

Java?? ??? ?? ???? ??? ??????

Java?? ??? ?? ???? ??? ??? ????. 1. ?? ?? ??? ?????. ?: "arr[0]=1" 2. ?? ??? ???? ??? ?? ?????. "(int num:arr)"? ??.

Nov 21, 2019 pm 04:42 PM

java ?? ?? ??

Java?? ???? ??

Java??? year%4==0&&year%100!=0 ? year%400==0 ?? ???? ??? ??? ? ? ??? ???? ? ???? ??? ? ????. ??.

Nov 21, 2019 pm 04:30 PM

java

Java?? ??? ????? ??

Java? ?? ??? ????: ?? ???? ?? ???? ????? ??? ???? ??? ?? jvm? ???? ??? ???? ??? ??? ??? ?? ??? ??? ?? ??? ?????. ????? ???? ???? ???? ?? ???? ??????.

Nov 21, 2019 pm 04:14 PM

java ??? ??

Java?? ??? ?? ??? ???? ??

Java?? ??? ?? ??? ???? ??: 1. StringUtils.isEmpty(CharSequence cs) ???? ???? ?????. 2. StringUtils.isEmpty(Object str) ???? ???? ??????.

Nov 21, 2019 pm 04:11 PM

java

Java?? ???? ?? ??? ???? ??? ??????

Java?? ???? ?? ??? ???? ??? ??? ????. 1. "equals()" ???? ?????. ?: "if(s == null ||"".equals(s))"; ???? ?????. ?: "if(s == null || s.length() <= 0)".

Nov 21, 2019 pm 03:58 PM

java ??? ?? ? ??

Java?? ??? ???? ??? ??????

Java?? ??? ???? ??: Calendar?? ???? DAY_OF_WEEK ???? ???? DAY_OF_WEEK? ?? ??? ??? ? ????.

Nov 21, 2019 pm 03:45 PM

java

Java?? ??? ???? ???? ??

Java?? ??? ???? ???? ??? ??? ????. ?? "valueOf()" ???? ???? ??? ?? ?? ??? ?? ??? ?? ???? ?????. ?: "[\u4e00-\ u9fa5]", ????? "matches()" ???? ???? Just match? ?????.

Nov 21, 2019 pm 03:42 PM

java ?? ??

Java? ? ??? ??? ??? ?? ??? ???? ??

?? ??? ??? ??? ?? ????? ???? Java? ??: ?? ?? ??? ??? ?? "put()" ???? ?? ???? ??? ??? ?? ??? ? ?? ???? ????? "map.containsKey"? ?????. ()" ?? ???? ?????.

Nov 21, 2019 pm 03:19 PM

java key ?? ??

Java? ????? ??? ?????.

Java?? ????? ???? ??: 1. ??? "[\u4e00-\u9fa5]"? ???? ????? ?????. 2. ??? ???? ???? 19968?? 40869 ???? ???? ?? ??? ????? ?????.

Nov 21, 2019 pm 03:15 PM

java

Java?? ???? IP?? ???? ??

Java?? ???? IP?? ???? ??? ??? ????. ?? ??? ??? IP ??? ????? ??? ?? ???? ???? "???" ??? ???? ???? ????? ???? ??? ?????. ?? ?? ?? ??? ?? "matcher()" ???? ??????.

Nov 21, 2019 pm 03:03 PM

ip java ?? ???