Java

1995 James Gosling
1996 Sun Microsystems > Oracle Corporation(2010)

JDK, JRE

Java Development Kit
Java Runtime Environment
JDK = JRE + javac

Version LTS

Release Family	End Of Support Life (EOSL)
25 LTS	September 2033
24	September 2025
23	March 2025
22	September 2024
21 LTS	September 2031
20	September 2023
19	March 2023
18	September 2022
17 LTS	September 2029
16	September 2021
15	March 2021
14	September 2020
13	March 2020
11 LTS	September 2026
10	September 2018
9	March 2018
8 LTS	December 2030
7 LTS	July 2022
6 LTS	December 2018
5 LTS	July 2015
4 LTS	March 2013
3 LTS	April 2011
2 LTS	December 2003
1 LTS	October 2002

from: https://java.com/releases/

Install

기본 용어

패키지(package)
클래스(class)
메소드(method)
명령문(statement)
자바의신 1권 20p
들여쓰기(indent)
예약어(reserved word)

Format

google style

실행 경로

public class CheckDirectory {
  public static void main(String args[]) {
    Path currentPath = Paths.get("");
    String path = currentPath.toAbsolutePath().toString();
    System.out.println("현재 작업 경로: " + path);
  }
}