Java? ??? ???? ??? ?????.
??? ???? ??? ???? Java? ??? ??? ????. ??????? ???? "isPrototypeOf()" ???? ???? ??? obj? ????? ??? ??? ?????. ?: "Array.prototype. isPrototypeOf(obj)"? ?? true? ?????.
Nov 21, 2019 am 11:34 AM
Java? ??? ????? ???? ??
Java??? file.exists() ???? ???? ??? ????? ??? ? ????. ??? ???? ????? ???? TRUE? ????, ??? ??? FALSE? ?????.
Nov 21, 2019 am 11:26 AM
Java? ???? ??? ???? ??? ?????.
Java?? ???? ??? ?? java.lang.character.isDigit() ???? ???? ???? ??? ??? ?????. Java? java.lang.character.isDigit(); ???? ??? ???? ??? ?????.
Nov 21, 2019 am 11:04 AM
??? ???? ??????
Java ??? ?? ???? ?? ???? ????? ??? ???? ??? ?????. ??? ?? ???? ??? ?? ???? ????? ?? ??? ? ????. Java? ???? ??? ??, ??? ??, ?? ??, ??? ??, ?? ?? ? ??/?? ??? ?????.
Nov 21, 2019 am 10:47 AM
Java? ???? ?? ??(???)? ???? ??? ?????.
Java?? ???? ?? ???? ???? ??? ???? ??: 1. startWith() ???? ???? ?????. 2. Contains ???? ???? ?????. 3. indexOf ???? ???? ?????.
Nov 21, 2019 am 10:32 AM
Java? ???? ??? ?????.
Java?? ???? ???? ??: 1. isDigit() ??? ???? ?????. 2. ??? "[0-9]*"? ???? ?????. 3. ??? ASCII ?? ?? ???? ??????. 4. NumberFormatException ??? ??? ?????.
Nov 21, 2019 am 10:17 AM
Java? ???? ??? ?????.
Java?? ????? ???? ??: ?? ?? ???? ???? ??? ?? ??(".")? ???? ???? ??? "."? ??? ?????. ??.
Nov 21, 2019 am 10:05 AM
Java? ???? ???? ???? ???? ???? ?????.
Java? ???? ???? ???? ???? ???? ?????. ??? "-?[0-9]+(\\.[0-9]+)?"? ???? ??? ? ????. ??? ?? ?? "BigDecimal" ??? ??? ???? ???? ???.
Nov 21, 2019 am 09:50 AM
Java?? ?????? ???? ?? ??
Java?? ??? ???? ?? ??: Scanner ???? ???? Java?? ??? ???? ?? ??? Scanner s=new Scanner(System.in);???. ??.
Nov 21, 2019 am 09:48 AM
Java? ??? ??? ?? ??? ?????.
??? ??? ?? ??? ???? Java? ??? ??? ????. ?? "ArrayList" ?? ???? ???? ?? ??? ???? ?? "isEmpty" ???? ???? ?? ??? ?? ??? ????, Clear ???? ???? ??? ???? ????? "isEmpty" ???? ???? ??????. ??? ???? ???.
Nov 21, 2019 am 09:38 AM
Java ??? ?? ??? ??? ?? ?? ???? ????.
????? ???? ???? ????? ?? ????? ??? Java ???? ?? ???? ?? ???? ????. ???? ???? JAVA_HOME, CLASSPATH ??? ?? ? ??? ? PATH? ???? ???. ??? ??.
Nov 21, 2019 am 09:27 AM
Java?? ??? ???? ???? ??
Java?? ??? ???? ???? ??: ???? equals ???? ????? ??? ? ??? ??? ???? ???? equals ???? ???? ? ???? ?????. ? ??? ??? ???? ??(?: "p1.equals (p2)")
Nov 21, 2019 am 09:23 AM
Java? ???? ??? ?????.
Java? ??? "[a-zA-Z]+"? ???? ???? ??? ??? ? ????. ? ???? ???? ?? ??? ??? ? ???, ???? true? ????, ??? ??? false? ?????.
Nov 21, 2019 am 09:15 AM
Java? ?? ?????? ?? ?????? ???
Java?? ?? ?????? ?? ?????? ???? ?? ?????? ?? ??? ???? ?????(?3??? ???? ?????)? ??, ?? ?????? ?? ???? ???? ?????(?? ??? ?? ?????)?? ????. ??? ???).
Nov 20, 2019 pm 05:29 PM
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