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Java

Java???

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

Java? ??? ???? Enumeration, BitSet, Vector, Stack, Dictionary, Hashtable, Properties ?? ?????.

Jan 14, 2020 pm 01:58 PM

java ??? ??

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

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

Jan 14, 2020 pm 01:45 PM

java ?? ??

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

Java? ?? ?? ???? ??? ? ????. Java??? ?? ????? ???? ? ?? ?? ??, ? ?? ??? ?? ??? ????.

Jan 14, 2020 pm 01:32 PM

java map

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

Java??? ?? ???? sendUrgentData ???? ???? ??? ?????? ??? ? ????. ??? SO_OOBINLINE ??? ?? ?? ??? Java?? ??? ?????.

Jan 14, 2020 pm 01:21 PM

java

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

??? ??? ??? ?? ?? ???? Java ??: OutputStreamWriter() ???? ???? ??? ???. OutputStreamWriter?? ??? ??? ???? gbk ?? ?? ? ??? ??? ? ????.

Jan 13, 2020 pm 04:35 PM

java ??? ??

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

??? Java ???? ??? ?? ???: 1. post ????? ????? ?? ? ???? ???? ????? request.setCharacterEncoding() ???? ??????. 2. get ???? ???? ???? ??? ? ???? ???? ???? ??????.

Jan 13, 2020 pm 04:11 PM

java ??? ??

Java?? ???? ?? ??? ?? null?? ???? ??

Java?? ???? ?? ??? ?? null?? ???? ??? ??? ????. 1. [if(str.length() == 0)] ?? [if(str.equals(" "))] ???? ???? ???? ?? ??? ?????. ???? ?? ????. 2. ???? null?? ????? [if(str == null)] ???? ?????.

Jan 13, 2020 am 10:49 AM

java null ?? ?

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

Java?? ??? ?? ??? ?????? ???? ??: ??? "\\s*|t*|r*|n*"? ???? ???? ??? ??? ???? ?? ???? ??? ??? ? ????. ?? ??? ???? ???? ??? ??? ??? ????.

Jan 09, 2020 am 10:34 AM

java ??? ??

Java ????? jar ??? ???? ??

Java?? Java ????? jar ??? ???? ??: 1. Eclipse ??? jar ??? ???? ????? ??? ?? ??? ??? ??? ???? ???? ????? jar ??? ?????. 2. jar ??? ?? java ??? jar ??? ?????.

Jan 09, 2020 am 09:48 AM

java

??? ??? ??? ??????

Java? ??? ??? Java?? ?? ??? ??? ??? ??? ??? ???? ???? ????? ????. ??? ???? ???? JVM? ?? ???? ??? ???? ???? ?????. ???? ?? ?? ??? ???? ???? ??? ??? ?? ?? ?????.

Jan 02, 2020 am 10:12 AM

java ?? ??? ????

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

Java?? ???? ???? ???? ??: 1. [==]? ???? ????? [String a = "abc"] ? [String a = new String("abc")? ??? ???? ???. ]; 2. [equals] ??? ???? ?????.

Jan 02, 2020 am 09:35 AM

java ?? ?

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

Java? ?? ???? ???? ????? ???? ??? ??? ????. ?? ???? ??? ? ????. ? ???? ???? true? ???? ??? ??? false? ?????(?: [boolean bool = list.contains("12")]). .

Dec 31, 2019 pm 04:59 PM

java ?? ? ????

Java ????? jar ??? ????? ??

Java ????? jar ??? ????? ??? ??? ????. 1. ?? ????? ???? ??? ??? ??? ??? ? [????]? ?????. 2. ?? ?? [jar ??]? ???? ???? ????? ?????. jar ?? ???? ??? ??? ???? [??]? ???? ???? ?????.

Dec 31, 2019 pm 04:51 PM

jar ?? ?? ???? ?

Java ??? C++ ???? ???

Java? ??? C++? ???? ???? ??? ????. 1. ??? ?? ? ???? ??? ??? ???? ?? ?? ???? ??? ??? ?? ???? ???? ??? ???? ???? ????. ???? ???? java ??? null?? ???? int???.

Dec 31, 2019 pm 04:38 PM

c++ java ??? ???? ??