지식저장소

1.이스케이프 시퀀스 (Escape Sequence)

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2.replace 🆚 replaceAll

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3.향상된 for문 (Enhenced for 문)

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4.String.split() 🆚 String.substring()

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5.String.valueOf() 🆚 toString()

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6.length 🆚 length() 🆚 size()

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7.new ArrayList<>() 🆚 Arrays.asList()

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8.== 🆚 equals()

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9.String 🆚 StringBuffer 🆚 StringBuilder

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10.배열 정렬 (오름차순, 내림차순)

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11.Math.round() 🆚 String.format()

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12.IntelliJ ShortCut) Fold Code Block

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13.프로세스 조회 및 죽이는(?) 법

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14.슬랙 (slack) 사용법

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15.zep 사용법

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16.지연 로딩(Lazy) 🆚 즉시 로딩(Eager)

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17.Math.max() / Math.min() 함수

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18.toCharArray()

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19.startsWith / endsWith 메서드

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20.substring() 메서드

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21.[SQL] ROUND() 함수

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22.[SQL] DATE_FORMAT() 함수

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23.[SQL] - ifnull() 함수

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24.JOIN 🆚 UNION

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25.Arrays.copyOf() 🆚 Arrays.copyOfRange() 🆚 System.arraycopy()

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26.contains() 🆚 indexOf()

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27.lastIndexOf()

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28.indexOf()

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29.trim() 메소드 / split() 정규표현식 사용하여 연속된 공백을 하나의 공백으로 처리

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30.getOrDefault(), values()

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31.BigInteger 클래스

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32.Arrays.compare()

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33.LocalDate, LocalTime, LocalDateTime 클래스

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34.Math.pow(), Math.sqrt() 함수

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