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Java

Java???

Java?? tostring ???? ???? ??

Java?? tostring? ???? ??? ??? ????. 1. Object ????? toString() ???? ??? ??? ?? ???? ? ???? ?????. 2. ??? ??? ??? ???? ???? ?? ?????. ?? toString() ???? ?? ???? ????.

Jun 16, 2020 pm 05:16 PM

java

JVM? ?? ??? ?? ????

JVM? Java Virtual Machine? ???, ???? ??? ??? ?? ???? ??????? ??? ??? ??????.

Jun 16, 2020 pm 04:23 PM

java jvm

JAVA??? ???? ??

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

Jun 16, 2020 pm 04:12 PM

java

??? 8?? ?? ??? ??? ??????

Java? 8?? ?? ??? ??? int, short, float, double, long, boolean, byte ? char???. Java? ?? ?? ??? ??? ??? ?? ??? ??? ? ??? ???? ????.

Jun 16, 2020 pm 02:35 PM

java ?? ??? ??

import java.util.* ?? ??? ??????

import java.util.* ?? ? ??? ??? ?? ???? ?????? ???? ?? ?????. "*"? util? ?? ???? ???? ????? ??? ?????. Import?? [import java.util.ArratList]? ?? ?? ?? ????? import ?? ????.

Jun 16, 2020 pm 01:49 PM

import java

springmvc ????? ??????

springmvc ?? ??? ??? ????. ?? ???? ??? ??? ??? ??? ?? ??? ?? ???? DispatcherServlet?? ??? ?? ModelAndView? ??? ?? ViewReslover ? ??? ?????. ; ??? ????? ??? ????? ?????.

Jun 15, 2020 pm 03:40 PM

java

jsp? ??? ??? ??????

jsp? ?? ?? ? ??? ??? ????. 1. ?? ??? ???? HttpServletRequet ???? Request ?? 2. ?? ??? ???? ?? ???? ??? ? ???? HttpSevletResponse ???? Response ?? ?????.

Jun 15, 2020 pm 02:19 PM

jsp

thread.sleep? ??? ??????

thread.sleep? ??? CPU ??? ?? ?? ????? ?? ??? ????? ????. ??? ??? ?? ???? ??? CPU ???? ??? CPU ???? ?? ?? ?? ???? ??? ? ????.

Jun 15, 2020 am 11:52 AM

java

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

Java? ?? javaSE, javaME ? javaEE? ? ???? ????. 1. ?? ??? ????? ??? 2. ??? ??? ?? ????? ?? ??? ????? ?? ???? ???? ? ?? ??? ?? ??, ????, ??? ?? ????? ??? ?????.

Jun 13, 2020 pm 04:34 PM

java

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

Java?? Annotation? ??? Annotation? ???? ??? ??????, Reflection? ?? Annotation? ???? Java Runtime?? ??? ?? ??? ?? [$Proxy]? ???? ?? ?? ??? ?? Annotation ???? ???? ?? ?? ????. ?? ?? ???? ?????.

Jun 13, 2020 pm 02:39 PM

java ??

random.nextint() ??? ??

[random.nextint()] ???: 1. ????? ?? [nextInt()]? ?? ??? ??? ?????. 2. ????? ?? [nextInt(int x)]? 0~x ??? ?????. X]; 3. ??? ?? ?? ??? ?????.

Jun 13, 2020 pm 02:15 PM

java

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

Java ?? ???? ???? ??? ????. 1. ??? ??? ???? Matcher ??? ?? 2. ??? ??? ???? Matcher ??? ?? 3. ??? ??? ???? Pattern ??? ?? ???? ???? ??? ???? ?? ??????.

Jun 13, 2020 am 11:02 AM

java