Develog

학원에서 공부했던 Oracle 11g 버전에서의 페이징 처리 (#{page}-1)*#{amount} ]]> 12버전에선 SELECT * FROM tbl_board ORDER BY bno OFFSET 20 ROWS FETCH NEXT 10 ROWS ONLY; 뭔가 MySQL 하는 기분

What is Singleton? => A singleton is a class that allows only a single instance of itself to be created and gives access to that created instance. LazyHolder Singleton Pattern public class Singleton { // LazyHolder Singleton pattern private Singleton(){}; private static class LazyHolder{ public static final Singleton instance = new Singleton(); } public static Singleton getInstance(){ return Laz..

Instagram Graph API Launches and Instagram API Platform Deprecation => Starting today (January 30), we are launching three new features on the Instagram Graph API designed to help businesses better manage their organic presence on Instagram. As part of our API changes, we will also be deprecating the older Instagram API Platform over the next two years beginning on July 31, 2018. 기존의 인스타API가 만료되..

마냥 좋다고 생각하고 여기저기 검색중에 이러한 글을 봤다. => lambda operations do not allow any external variable operation within itself. 제길... 역시 뭔가 약점은 존재하는군... 성능에서도 for loop와 stream forEach를 비교했을때 더 떨어진다고 한다. 성능 테스트 public class Main { public static void main(String[] args) { // for loop와 stream forEach 의 성능 비교 Long forLoopStart = System.currentTimeMillis(); for (int i = -210000000; i < 2100000000; i++) { for (int ..

이번엔 Domain 만들어서 테스트 Board라는 Domain을 만들었다. public class Board { private Long bno; private String writer; private String content; private LocalDate regdate; private LocalDate updatedDate; public static class Builder { private Long bno; private String writer; private String content; private LocalDate regdate; private LocalDate updatedDate; public Builder bno(Long bno) { this.bno = bno; return this;..

Lambda Expressions => One issue with anonymous classes is that if the implementation of your anonymous class is very simple, such as an interface that contains only one method, then the syntax of anonymous classes may seem unwieldy and unclear. In these cases, you're usually trying to pass functionality as an argument to another method, such as what action should be taken when someone clicks a b..