✅ What does access modifier do? Allow access or hide class, field, constructor, method from outside class/package Developer should not change speaker volume outside speaker class ...

✅ this this refers to the field of the current class this is to distinguish which is field and which is paramter when the variable names are the same this.name: the name field of th...

Procedural Oridented 🆚 Object oriented Procedural Oridented: 순서 중요, how, 메소드 분리 Object oriented: 객체, what, 객체안에 메소드 포함 ✅ example of procedural programming example of Music Player ...

✅ Primitive type int, long, double, boolean save value itself int A = 10; ✅ Reference type class is reference type String save memory value Student student = new Student(); stud...

✅ Why do we need class? collect each student’s charecteristics in one class create one student class and save one student’s name, age, grade in one class there is int type, String...

✅ Reference https://www.springcloud.io/post/2022-02/spring-security-get-current-user/#gsc.tab=0 https://velog.io/@ke2007/jwt-%ED%98%84%EC%9E%AC-%EB%A1%9C%EA%B7%B8%EC%9D%B8%ED%95%...

✅ Access token, Refresh token with body ## ✅ Access token, Refresh token with body ### ✔️ Reference - easy to follow ver - <https://www.bezkoder.com/spring-boot-refresh-token-jwt/> - re...

✅ CICD settings nohup해서 실행했을 때 잘 실행되는 상태 .github안에 workflows라는 파일 만들고 이 안에 cd.yml 파일 생성 test controller도 하나 있으면 변경되는 내용 확인하기에 좋음 @Slf4j @RestController public class TestController ...

✅ Requirements 인덱스가 있으면 검색 속도 향상에 도움이 됨 검색하고 싶은 것은 두 종류 user name index goal title index ✅ 참고자료 DB조회 최적화 방법, index 설정 방법, explain 사용 방법 https://wanglan.tistory.com/entry/Spri...

🔴 Permission Denied(public key, password) ✅ Reference Permission Denied(public key) PasswordAuthentication yes, SSH 재시작 https://overpassion.tistory.com/174 Permission Denied(pu...