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Java

Java???

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

Java?? ??? ?? ??? ???? ??: if ?? ?? ???? "array==null"? ?? ??? ?? ??? ?????, "array.length==0"? ???? ?? ??? 0?? 0???? ?????. ??? ?? ??? ?????.

Nov 19, 2019 pm 02:21 PM

java ??

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

Java?? ???? ???? ??: 1. ???? ????? java.math ???? ??? API ??? BigDecimal? ?????. 2. NumberFormat? ?? ???? DecimalFormat? ?????. 3. String.format? ?????. 4. NumberFormat? ?????.

Nov 19, 2019 pm 02:00 PM

java

Eclipse? ???? Java ??? ???? ??

Eclipse? ???? Java ??? ???? ??: ?? "project" ??? "javadoc ??" ???? ??? ?? "javadoc" ?? ????? ???? Java ???? ? ?? ?? ????? ???? ??? ??? ?? ????? ?? ???? ?????. .

Nov 19, 2019 pm 01:55 PM

eclipse java ?? ??

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

Java? ?? ??: 1. System.in.read() ???? ???? ??? ????. 2. BufferedReader ???? InputStreamReader ???? ???? ??? ????. 3. Scanner ???? ???? ??? ????.

Nov 19, 2019 pm 01:44 PM

java

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

Java ????? ??? ????? ??? ??? ????. 1. ???? ?? ???? ??? ???. 2. ??? ???? ???. 4. ??? ????? ????? ???. ????? ????? ?? ?? ??? ???? ??? ???.

Nov 19, 2019 pm 01:42 PM

java ?? ???? ????

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

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

Nov 19, 2019 pm 01:31 PM

java

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

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

Nov 19, 2019 pm 01:24 PM

java ??? ??

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

Java?? ???? ???? ???? ??: 1. ????? Java? ?? ???? Character.isDig(char ch) ???? ?????. 2. ??? "-?[0-9]+(\\.[0-9]+)?"? ???? ???? ???? ?????.

Nov 19, 2019 pm 01:21 PM

java ?

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

Java?? ???? ??? ????? ???? ??? ??? ????. ???? ??? ????? ????? "file.exists()" ?? "file.isDirectory()" ???? ??? ? ????. true? ????, ??? ??? false? ?????.

Nov 19, 2019 am 10:49 AM

java ?? ???? ?? ?? ??

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

Java?? ???? ???? ???? ??? ??? ????. "equals(object obj)" ???? ???? ??? ? ????. ?? ?? "a.equals(b)"? ??? true? ?????. , ??? ??? false? ?????.

Nov 19, 2019 am 09:37 AM

java ?? ?

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

Java?? ??? ?? ???? ??? ??? ????. 1. "=="? ???? ?? ?????. ?? ? ??? ? ??? ?? ???? ?? ?? ??? ?? ??? ?????. "System.ararycopy" ???? ???? ? ???? ??? ?? ??? ?? ?? ??? ???? ?????.

Nov 18, 2019 pm 05:34 PM

java ?? ??

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

Java?? ??? ???? ??? ??? ????. 1. "int[] arr = {1,2,4, ...}"? ?? ?? ???? ?????. 2. ??? ???? ?? ?? ??? ?????. "int[] arr ;arr = new int[]{1,2,3,…}"? ?? ?? ?????.

Nov 18, 2019 pm 05:21 PM

java ??? ??

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

Java?? ??? ??? ???? ??? ????. 1. ?? ???? "??"?? ?? ???? "??"???. 2. ?????? ???? ?? ???? ?? ?????? ?? ???? ??? ??? ???. ????? ???? ??? ??? ?? ???? ??? ? ????.

Nov 18, 2019 pm 05:05 PM

java ??? ???? ????