취준 중인 앞구름기

🧐강의🧐 https://www.inflearn.com/course/%EC%8A%A4%ED%94%84%EB%A7%81-%ED%95%B5%EC%8B%AC-%EC%9B%90%EB%A6%AC-%EA%B8%B0%EB%B3%B8%ED%8E%B8/dashboard ✨ 스프링이란? · 스프링 : 여러 가지 기술들의 모음 (문맥에 따라 다른 해석) 》 스프링 DI 컨테이너 기술 》 스프링 프레임워크 》 스프링 부트, 스프링 프레임워크 등을 모두 포함한 스프링 생태계 · 스프링 프레임워크 : 스프링 부트를 이용하여 기술들을 편리하게 사용 》 핵심 기술 : 스프링 DI 컨테이너, AOP, 이벤트, 기타 》 웹 기술 : 스프링 MVC, 스프링 WebFlux 》 데이터 접근 기술 : 트랜잭션, JDBC, ORM, XML 》 기..

🤹‍♂️Java Brains 강의🤹‍♂️ https://www.youtube.com/playlist?list=PLqq-6Pq4lTTa9YGfyhyW2CqdtW9RtY-I3 ✅ Streams : A sequence of elements supporting sequential and parallel aggregate operations ✨ stream() ✔️ Returns a sequential stream with this collection as its source import java.util.Arrays; import java.util.List; public class Main { public static void main(String[] args) { List people = Arrays.asLi..

🤹‍♂️Java Brains 강의🤹‍♂️ https://www.youtube.com/playlist?list=PLqq-6Pq4lTTa9YGfyhyW2CqdtW9RtY-I3 people 리스트 출력하기 for loop for-in loop for-each loop ✨ External Iterator · for & for-in loop import java.util.Arrays; import java.util.List; public class Main { public static void main(String[] args) { List people = Arrays.asList( new Person("Charles", "Dickens", 60), new Person("Lewis", "Carroll", 42),..

🤹‍♂️Java Brains 강의🤹‍♂️ https://www.youtube.com/playlist?list=PLqq-6Pq4lTTa9YGfyhyW2CqdtW9RtY-I3 ✨ No input arg. & Calling a method without any args ☑️ () → method() · Examples public class Main { public static void main(String[] args) { // no input argument & calling a method without any arguments // Thread t = new Thread(() -> printMessage()); -> method execution Thread t = new Thread(Main::pri..

🤹‍♂️Java Brains 강의🤹‍♂️ https://www.youtube.com/playlist?list=PLqq-6Pq4lTTa9YGfyhyW2CqdtW9RtY-I3 ✨ 'This' reference in Lambda · the instance of a lambda that does not touch 'this' reference → unmodified · no overriding ✨ Lambda vs. Anonymous Inner Class · Interface interface Process { void process(int i); } · Lambda : it still refers to the instance that it points to outside of the lambda public ..

🤹‍♂️Java Brains 강의🤹‍♂️ https://www.youtube.com/playlist?list=PLqq-6Pq4lTTa9YGfyhyW2CqdtW9RtY-I3 ✔️ Closure : 내부에서 외부 함수의 지역 변수 호출하기 · Code public class Main { public static void main(String[] args) { int a = 10; int b = 20; doProcess(a, i -> System.out.println(i + b)); } private static void doProcess(int i, Process p) { p.process(i); } } interface Process { void process(int i); } ➡️ main 함수에서 do..

🤹‍♂️Java Brains 강의🤹‍♂️ https://www.youtube.com/playlist?list=PLqq-6Pq4lTTa9YGfyhyW2CqdtW9RtY-I3 💡 someNumbers 배열 원소들을 key 값으로 나눈 나머지 출력하기 💡 · key 값이 2일 때 출력 (정상) · key 값이 0일 때 출력 (예외 상황) · Code import java.util.function.BiConsumer; public class Main { public static void main(String[] args) { int[] someNumbers = {1,2,3,4}; int key = 2; process(someNumbers, key, wrapperLambda((v, k) -> System.out...

🤹‍♂️Java Brains 강의🤹‍♂️ https://www.youtube.com/playlist?list=PLqq-6Pq4lTTa9YGfyhyW2CqdtW9RtY-I3 🐣 Missions 🐣 ☝️ Sort list by last name ✌️ Create a method that prints all elements in the list 👌 Create a method that prints all people that have last name beginning with C 🐤 Solution 🐤 · Interface public class Person { private String firstName; private String lastName; private int age; public Person(..

🤹‍♂️Java Brains 강의🤹‍♂️ https://www.youtube.com/playlist?list=PLqq-6Pq4lTTa9YGfyhyW2CqdtW9RtY-I3 ✨ Lambda vs. Interface Implementations · Interface public interface Greeting { public void perform(); } · Interface Implementation public class GreetingImpl implements Greeting{ @Override public void perform() { System.out.println("Hello Java8"); } } · Main public class Main { public static void main(..

🤹‍♂️Java Brains 강의🤹‍♂️ https://www.youtube.com/playlist?list=PLqq-6Pq4lTTa9YGfyhyW2CqdtW9RtY-I3 ✨ Code in OOP ☑️ Object Oriented Programming (OOP) 에 문제가 있어서 Java8 Lambda 가 나온 것 (진짜?) · Everything is an object · All code blocks are 'associated' with classes and objects ✨ Why Lambdas? · Enables functional programming · Readable and concise code · Easier to use APIs and libraries · Enable support f..