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Java

Java???

Java VM? ???? ?? ??? ??????.

Java VM ??? ?? ?? ??: ?? ????? ?? ??? Java? ??? ?? JAVA_HOME ?? ??? ???? ????? Path ? CLASSPATH ?? ??? ??? ? jdk? ?? ??? ?????.

Nov 20, 2019 am 10:28 AM

java vm

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

Java ????? ???? ??? ? ?? ??? ?? ?? ??: ?? "java javaCode" ??? ???? Java ?? ???? ??? ?? "export JAVA_TOOL_OPTIONS=-Dfile.encoding=UTF8" ??? ???? ???? UTF-? ?????. 8.

Nov 20, 2019 am 10:23 AM

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

?? ??? ???? ??

Java ?? ?? ??: cmd? ?? javac xxx.java ??? ???? Java ??? ????? ??? ??? ??? ?? cmd? java xxx ??? ???? Java ??? ?????.

Nov 20, 2019 am 10:21 AM

java

?? gc? ???

Java gc? ??? ?? ????? ?????. ?? ?????? ??? ? ?? ??? ? ??? ? ??? ???? ??? ??? ??? ????. Java ?? ??? ??? ????? ??? ??? ??? ?? ? ??? ??? ?????.

Nov 20, 2019 am 10:12 AM

gc java

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

Java? ??? "[0-9]*"? ???? ???? ??? ? ????. match() ???? ???? ???? ??? ???? ????? ??? ??? ? ????.

Nov 20, 2019 am 10:04 AM

java

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

Java? ?? ??? ??? ??? ???? ??: ?? Alibaba Cloud SMS ???? ??? ???? ??? ?? "AccessKey ID" ? "Access Key Secret"? ??? ?? jar ???? ?????? ????? Sendmss ???? ?????.

Nov 20, 2019 am 10:01 AM

java ?? ??? ?? ???

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

Java ???? ??? ?? ?? ??: ?? ???? ?? - ????? ?? - JRE ??? ?????? ??? ??? ???? ??? ?? ????? ???? jdk ??? ? ? ???? ????? Eclipse ???? ???? ??? ?????.

Nov 20, 2019 am 09:55 AM

import java ?? ??

???? ?? ?? ??

Java?? ?? ?? ??: 1. JFrame? ???Events ? processWindowEvent? ???? ?? ????. 2. WindowListener ?????? ?? ???? ?? ????. 3. Inner Class? ???? ?? ????.

Nov 20, 2019 am 09:54 AM

java

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

Java?? ?? ??? ???? ??: ?? ??? ???? ???? ?? ???? ?? ?? ??? ??? ??? ???? ??? ????? ??? ?? ????? "if else" ?? ???? ??? ??? ????? ?????.

Nov 20, 2019 am 09:47 AM

java ?? ????

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

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

Nov 20, 2019 am 09:45 AM

java

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

Java ????? Eclipse? ???? ??: 1. Eclipse ?????? ???. 2. ?? ????? ?????. 3. General-Existing Projects? ???? ??? ?????.

Nov 20, 2019 am 09:41 AM

eclipse

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

Java ????? ???? ????? "Scanner in = new Scanner(System.in)"? ?? Scanner ???? ??? ? ????. ? ??? ??? ??? ??? ???? ?? ??? ????? ?????. ???? ?? ??? ?????.

Nov 20, 2019 am 09:33 AM

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

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

Java?? ?? ??? ?? ??: 1. ??? length() ???? ?? ?????. 2. file.io.*?? ???? ???? ?????. 3. file.nio.*? FileChannel ??? ?? ?? ????.

Nov 20, 2019 am 09:23 AM

java

Java?? ??? '=='? ???

Java?? ??? "=="? ???? ??? ????. "=="? ??(??) ???? ??? ???(?) ??? ??? ???? ? ??? ??? ????? ???? ? ?????. same, equals? ???? ?? ???? ?? ? ??? ??? ??? ?????.

Nov 19, 2019 pm 05:03 PM

== equals java ???