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아이템3) private 생성자나 열거 타입으로 싱글턴임을 보증하라

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싱글턴(Singleton)

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싱글턴을 만드는 방법 3가지

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1. public static final 필드 방식

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public class Elvis {\n  public static final Elvis INSTANCE = new Elvis();\n  private Elvis() {...}\n\n  public void leaveTheBuilding() {...}\n}
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2. public static method 방식

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public class Elvis {\n  private static final Elvis INSTANCE;\n  private Elvis() {...}\n  public static getInstance() { return INSTANCE; }\n\n  public void leaveTheBuilding() {...}\n}
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1,2번의 예외

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참고
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3. Enum 방식

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public enum Elvis {\n   INSTANCE;\n   public void leaveTheBuilding() {...}\n}
","fields":{"tagSlugs":["/tags/책리뷰/","/tags/이펙티브자바/"],"slug":"/history/posts/2020-10-04--003--03"},"frontmatter":{"title":"[책리뷰/Effective Java] 객체 생성과 파괴","tags":["책리뷰","이펙티브자바"],"date":"2020-10-04","description":"아이템3) private 생성자나 열거 타입으로 싱글턴임을 보증하라"}}},"pageContext":{"slug":"/history/posts/2020-10-04--003--03"}},"staticQueryHashes":[]}