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Java

Java???

java if(x)? ??? ??????

java if(x)? ??? ?? x? ?? ?? ?? ??, 0? ???, false? ???, null? ?? ? ?? ??? ????? ????.

Nov 18, 2019 pm 01:38 PM

if java

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

??? ?? ?? ???? ??? ???? Java ???: ??? ??? ??? ???? ??? ???? ? ???? "contains(Object o)" ???? ??? ? ???, ??? ??? ??? ???? ??? true? ?????. ??? ??? false? ?????.

Nov 18, 2019 pm 01:26 PM

java list ????

Java int? ??? ??????

Java int? 4???, 32???? ? ??? -2^31~2^31-1, ? ??? -2147483648~2147483647???.

Nov 18, 2019 pm 01:24 PM

int java ??

???? list? arraylist? ???

Java?? List? ArrayList? ???? ??? ????. List? ??????? ArrayList? List ?????? ?? ??????. ArrayList ???? List ?????? ???? ?????.

Nov 18, 2019 pm 01:17 PM

arraylist java list ???

?? jdk? ??? ????

Java jdk? ????? C:\Program Files\Java\ ????? ?????. Linux ?????? ?? ??? ??? cmd? ?? "java -version"? ???? which java ??? ??? ? ????.

Nov 18, 2019 pm 01:08 PM

java jdk ?

?? ?? ? ??????

Java ?? HashMap ? HashTable? ?? ???? ??? ???? ???? ?????. LinkedHashMap ? TreeMap? ?? ???? ?? ?? ?? ??? ?????? ?????.

Nov 18, 2019 am 11:46 AM

java key map ??

Java?? import ???? ??? ??????

Java? import ???? ???? ???? ? ?????. ???? ?? ???? ????? ???? ?? import ???? ???? ???? ???. ?? ?? "java.util.*"? util ??? ??? ?? ??? ?? ?????? ???? ?? ?????.

Nov 18, 2019 am 11:38 AM

import java ???

?? ?? ???? ???

Java ?? ??? ???? ??? ????. 1. ?? ? ??? ? ??? ???? ????? ??? ??? ? ????. 2. ??? ??? ?? ???? ???? ??? ??? ? ????. ??? ???? add ??? 4. Map? ??? ???? ?? put ???? ?????.

Nov 18, 2019 am 11:24 AM

java list map

Java?? for ??? ???? ??

Java? for ???? ???? ??? ??? ????. ?? ??? ??? ?? break? ???? ????? ?????. ?? ??? ??? ?? for ??? ?? ?? ??? ??? ? ????. ?? + ?? ???? ? ?? ??? ?? break? ???? for ???? ???? ? ????.

Nov 18, 2019 am 11:14 AM

for java ?? ????

?? ?? ??? ??

Java ?? ?? ??? ?? ???: ?? ???? InputStreamReader? ???? ?????? ?? ???? utf-8 ????? ????, OutputStreamWriter? ???? ?? ???? utf-8 ????? ??? ?? ??? utf-8 ???? ?????. ??.

Nov 18, 2019 am 11:05 AM

java socket ??? ??

???? '...'?(?) ?? ?????

Java?? "..." ??? ?? ?? ????? ?????. ?? ? ??? ????? ??? ??? ? ??? ??? ? ??? ?????. ?? ?? ?? ????? ???? ?? ?? ??? ????? ?????. ??? ????? ??? ?????.

Nov 18, 2019 am 11:00 AM

java ??

Java SQL ?? ???? ??

Java SQL ?? ???? ??: ?? SQL ? ?????? ??? ?? ??? ?? ????? ???? ????? ??? ? ?? + ??? ?????. ??? ??.

Nov 18, 2019 am 10:51 AM

java sql

???? >>>? >>? ???

Java?? ">>>>"? ">>"? ???? ??? ????. ">>"? ??? ???? ?????. ??? ???? ?? ??? 0?? ?????. ???? ?? ??? ?????. ">>>>"? ?? ?? ??? ???? ?????. ??? ???? ?? ??? 0?? ????, ??? ???? ??? ??? ??? ?? ??? 0?? ?????.

Nov 18, 2019 am 10:44 AM

java ???

?? ???? ?????.

??? Java ???? ?? ?? ??: 1. "new String(str.getBytes("ISO-8859-1"), "utf-8")"? ???? ???? utf-8 ????? ?????. 2. "URLDecoder.decode"? ?????. "? ???? URL? ????????.

Nov 18, 2019 am 10:22 AM

java string ??? ??