AndersonChoi

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# this work for additional information regarding copyright ownership.
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AndersonChoi

MongoDB

Introduce this document

C++로 작성된 오픈소스 문서지향적 Cross-platform 데이터베이스인 mongodb의 명령어를 모은 document입니다.

Database 조회/생성/삭제

DB 생성하기

$ use testdb

AndersonChoi

Kafka 2.0.0 Cheat Sheet

Kafka Topics

List existing topics

./kafka-topics --zookeeper localhost:2181 --list

Describe a topic

./kafka-topics --zookeeper localhost:2181 --describe --topic mytopic

Purge a topic

./kafka-topics --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000

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import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class Main{


    public static void main(String []args){
        System.out.println("Hello World");

AndersonChoi

<?xml version = "1.0" encoding = "UTF-8"?>

<beans xmlns = "http://www.springframework.org/schema/beans"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation = "http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

   <!-- 간단한 bean 설정 -->
   <bean id = "..." class = "...">

AndersonChoi

package com.company;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.IntSummaryStatistics;
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;
import java.util.Map;

public class Main {

AndersonChoi

class NewBook extends AbstractBook{
  private final int code=2;
  private final int point=800;
  
}

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class ChildBook extends AbstractBook{
  private final int code=1;
  private final int point=1000;
  
}

AndersonChoi

abstract class AbstractBook implements Book{
  
  public int priceCode(){
    return this.code;
  }
  
  public int getPointPercent(){
    return this.point;
  }
  

AndersonChoi

class NewBook implements Book{
  private final int code=2;
  private final int point=800;
  
  @Override
  public int priceCode(){
    return this.code;
  }
  @Override
  public int getPointPercent(){