{"id":4082,"date":"2021-12-09T08:19:36","date_gmt":"2021-12-08T23:19:36","guid":{"rendered":"https:\/\/www.skyer9.pe.kr\/wordpress\/?p=4082"},"modified":"2021-12-09T11:59:31","modified_gmt":"2021-12-09T02:59:31","slug":"java-oop","status":"publish","type":"post","link":"https:\/\/www.skyer9.pe.kr\/wordpress\/?p=4082","title":{"rendered":"JAVA OOP, Generic, Collection"},"content":{"rendered":"

JAVA OOP, Generic, Collection<\/h1>\n

\ucc38\uc870<\/a>
\n\ucc38\uc870<\/a><\/p>\n

OOP\uc758 \ud2b9\uc9d5 4\uac00\uc9c0<\/h2>\n

\ucea1\uc290\ud654(Encapsulation)<\/h3>\n

\uad6c\ud604\uc744 \uc678\ubd80\uc5d0 \uc228\uae30\ub294 \uac83\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.
\n(\ub77c\uace0 \uc368\ub193\uace0 \ub85c\uc9c1\uc744 \ud074\ub798\uc2a4\uc5d0 \ubab0\uc544 \ub123\ub294\ub2e4\ub77c\uace0 \ud574\uc11d\ud569\ub2c8\ub2e4.)<\/p>\n

public class CustomerOrder {\n    private String cancelyn;\n    public void cancel() {\n        this.cancelyn = "Y";\n        \/\/ \ub9c8\uc77c\ub9ac\uc9c0 \uad00\ub828 \ub85c\uc9c1\n        \/\/ \ucfe0\ud3f0 \uad00\ub828 \ub85c\uc9c1\n        \/\/ \uc7ac\uace0 \uad00\ub828 \ub85c\uc9c1\n    }\n}\n\nCustomerOrder customerOrder = new CustomerOrder();\ncustomerOrder.cancel();<\/code><\/pre>\n
\uad6c\ud604\uc744 \uc228\uae30\uc9c0 \uc54a\uc73c\uba74 \uc5b4\ub5bb\uac8c \ub420\uae4c\uc694?<\/p>\n
public class CustomerOrder {\n    public String cancelyn;\n}\n\nCustomerOrder customerOrder = new CustomerOrder();\ncustomerOrder.cancelyn = "Y";\n\/\/ \ub9c8\uc77c\ub9ac\uc9c0 \uad00\ub828 \ub85c\uc9c1\n\/\/ \ucfe0\ud3f0 \uad00\ub828 \ub85c\uc9c1\n\/\/ \uc7ac\uace0 \uad00\ub828 \ub85c\uc9c1<\/code><\/pre>\n
\ub9cc\uc57d canceldate \ub97c \ucd94\uac00\ud558\uace0\uc790 \ud55c\ub2e4\uba74?<\/p>\n
public class CustomerOrder {\n    public String cancelyn;\n    public LocalDateTime canceldate;\n}\n\nCustomerOrder customerOrder = new CustomerOrder();\ncustomerOrder.cancelyn = "Y";\ncustomerOrder.canceldate = LocalDateTime.now();\n\/\/ \ub9c8\uc77c\ub9ac\uc9c0 \uad00\ub828 \ub85c\uc9c1\n\/\/ \ucfe0\ud3f0 \uad00\ub828 \ub85c\uc9c1\n\/\/ \uc7ac\uace0 \uad00\ub828 \ub85c\uc9c1<\/code><\/pre>\n
\ucde8\uc18c \uae30\ub2a5\uc774 \uc788\ub294 \uacf3\uc774 \ub2e4\uc218\ub77c\uba74, \ucc3e\uc544\ub2e4\ub2c8\uba74\uc11c \ud558\ub098\ud558\ub098 \ucf54\ub4dc\ub97c \ucd94\uac00\ud574 \uc8fc\uc5b4\uc57c \ud569\ub2c8\ub2e4.
\n\ubabb \ucc3e\uc740 \uacf3\uc774 \ubc1c\uc0dd\ud558\uba74 \ubc84\uadf8\uac00 \ub429\ub2c8\ub2e4.<\/p>\n
\ubaa8\ub450 \ucc3e\uc558\ub2e4 \ud574\ub3c4, \uc911\ubcf5\ucf54\ub4dc\uac00 \uc0b0\uc9c0\uc0ac\ubc29\uc5d0 \ud37c\uc9c0\uac8c \ub429\ub2c8\ub2e4.<\/p>\n
public class CustomerOrder {\n    private String cancelyn;\n    public LocalDateTime canceldate;\n    public void cancel() {\n        this.cancelyn = "Y";\n        this.canceldate = LocalDateTime.now();\n        \/\/ \ub9c8\uc77c\ub9ac\uc9c0 \uad00\ub828 \ub85c\uc9c1\n        \/\/ \ucfe0\ud3f0 \uad00\ub828 \ub85c\uc9c1\n        \/\/ \uc7ac\uace0 \uad00\ub828 \ub85c\uc9c1\n    }\n}\n\nCustomerOrder customerOrder = new CustomerOrder();\ncustomerOrder.cancel();<\/code><\/pre>\n
\ucea1\uc290\ud654\ud588\ub2e4\uba74 \uba54\uc18c\ub4dc \ud558\ub098\ub9cc \uc218\uc815\ud574\uc8fc\uba74 \ub05d\ub0a9\ub2c8\ub2e4.<\/p>\n
\uc0c1\uc18d(Inheritance)<\/h3>\n
2\uac1c \uc774\uc0c1\uc758 \ud074\ub798\uc2a4\uc5d0\uc11c \uc911\ubcf5\ub418\ub294 \ucf54\ub4dc\ub97c \ubd80\ubaa8 \ud074\ub798\uc2a4\ub85c \ub9cc\ub4e4\uae30\ub3c4 \ud558\uace0,
\n\ud558\ub098\uc758 \ud074\ub798\uc2a4\uc5d0\uc11c \uae30\ub2a5\ud655\uc7a5\uc744 \uc704\ud574 \uc790\uc2dd \ud074\ub798\uc2a4\ub97c \ub9cc\ub4e4\uae30\ub3c4 \ud569\ub2c8\ub2e4.<\/p>\n
\/\/ \uace0\uac1d \uc8fc\ubb38\npublic class CustomerOrder { }\n\n\/\/ \uaf43\ubc30\ub2ec \uace0\uac1d \uc8fc\ubb38\npublic class FlowerCustomerOrder extends CustomerOrder {\n    \/\/ \uaf43\ubc30\ub2ec \uad00\ub828 \ub85c\uc9c1\ub9cc \ucd94\uac00\n}\n\n\/\/ \ud574\uc678\ubc30\uc1a1 \uace0\uac1d \uc8fc\ubb38\npublic class ForeignCustomerOrder extends CustomerOrder {\n    \/\/ \ud574\uc678\ubc30\uc1a1 \uad00\ub828 \ub85c\uc9c1\ub9cc \ucd94\uac00\n}<\/code><\/pre>\n
\/\/ \ubcf4\ub108\uc2a4 \ucfe0\ud3f0\npublic class BonusCoupon { }\n\n\/\/ \ube44\uc728 \ubcf4\ub108\uc2a4 \ucfe0\ud3f0\npublic class PercentBonusCoupon extends BonusCoupon { }\n\n\/\/ \uae08\uc561 \ubcf4\ub108\uc2a4 \ucfe0\ud3f0\npublic class PriceBonusCoupon extends BonusCoupon { }<\/code><\/pre>\n
\ucd94\uc0c1\ud654(Abstraction)<\/h3>\n
\ud544\uc694\ud55c \uae30\ub2a5\uc740 \uc54c\uaca0\ub294\ub370, \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc5c6\uc744 \ub54c \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/p>\n
\uc544\ub798\uc758 \ucf54\ub4dc\uc5d0\uc11c getDiscountPrice() \ucc98\ub7fc, \ud544\uc694\ud55c \uae30\ub2a5\uc740 \uc788\uc9c0\ub9cc,
\n\uc2e4\uc81c\ub85c \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc5c6\uc744\ub54c abstract<\/code> \ub85c \ucd94\uc0c1\ud074\ub798\uc2a4\ub97c \ub9cc\ub4e4\uace0,
\n\uc790\uc2dd \ud074\ub798\uc2a4\uc5d0\uc11c \uc2e4\uc81c \ucf54\ub4dc\ub97c \uc791\uc131\ud558\ub3c4\ub85d \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
public class OrderProduct {\n    private BigDecimal price;\n    private int orderCount;\n    \/\/ getter & setter\n}\n\n\/\/ \ucd94\uc0c1 \ud074\ub798\uc2a4\npublic abstract class BonusCoupon {\n    \/\/ \ucd94\uc0c1 \uba54\uc18c\ub4dc\n    public abstract BigDecimal getDiscountPrice(List<OrderProduct> items, int index);\n}\n\npublic class PercentBonusCoupon extends BonusCoupon {\n    @Override\n    public BigDecimal getDiscountPrice(List<OrderProduct> items, int index) {\n        \/\/ \ube44\uc728\ucfe0\ud3f0 \uacc4\uc0b0 \ub85c\uc9c1\n        return BigDecimal.ZERO;\n    }\n}\n\npublic class PriceBonusCoupon extends BonusCoupon {\n    @Override\n    public BigDecimal getDiscountPrice(List<OrderProduct> items, int index) {\n        \/\/ \uae08\uc561\ucfe0\ud3f0 \uacc4\uc0b0 \ub85c\uc9c1\n        return BigDecimal.ZERO;\n    }\n}<\/code><\/pre>\n
\ucd94\uc0c1\ud654\uc758 \uadf9\ub2e8\uc801\uc778 \uc608\ub85c interface<\/code> \uac00 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
public interface List<E> extends Collection<E> {\n    int size();\n    boolean isEmpty();\n    \/\/ ......\n}<\/code><\/pre>\n
\ucd94\uc0c1 \ud074\ub798\uc2a4\ub294 \uc77c\ubd80 \uba54\uc18c\ub4dc\uc758 \ucf54\ub4dc\ub97c \uc791\uc131\ud558\uc9c0 \uc54a\ub294 \uac83\uc774\uace0,
\n\uc778\ud130\ud398\uc774\uc2a4\ub294 \ubaa8\ub4e0 \uba54\uc18c\ub4dc\uc758 \ucf54\ub4dc\ub97c \uc791\uc131\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.
\n\ub610\ud55c, abstract<\/code> \ud0a4\uc6cc\ub4dc\ub97c \uc0dd\ub7b5\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\ub2e4\ud615\uc131(Polymorphism)<\/h3>\n
\uc704\ud0a4\ud53c\ub514\uc544\uc5d0 \uc544\ub798\uc640 \uac19\uc774 \uc124\uba85\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\n
\ud504\ub85c\uadf8\ub7a8 \uc5b8\uc5b4\uc758 \ub2e4\ud615\uc131(\u591a\u5f62\u6027, polymorphism; \ud3f4\ub9ac\ubaa8\ud53c\uc998)\uc740 \uadf8 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc758 \uc790\ub8cc\ud615 \uccb4\uacc4\uc758 \uc131\uc9c8\uc744 \ub098\ud0c0\ub0b4\ub294 \uac83\uc73c\ub85c, \ud504\ub85c\uadf8\ub7a8 \uc5b8\uc5b4\uc758 \uac01 \uc694\uc18c\ub4e4(\uc0c1\uc218, \ubcc0\uc218, \uc2dd, \uc624\ube0c\uc81d\ud2b8, \ud568\uc218, \uba54\uc18c\ub4dc \ub4f1)\uc774 \ub2e4\uc591\ud55c \uc790\ub8cc\ud615(type)\uc5d0 \uc18d\ud558\ub294 \uac83\uc774 \ud5c8\uac00\ub418\ub294 \uc131\uc9c8\uc744 \uac00\ub9ac\ud0a8\ub2e4. \ubc18\ub313\ub9d0\uc740 \ub2e8\ud615\uc131(monomorphism)\uc73c\ub85c, \ud504\ub85c\uadf8\ub7a8 \uc5b8\uc5b4\uc758 \uac01 \uc694\uc18c\uac00 \ud55c\uac00\uc9c0 \ud615\ud0dc\ub9cc \uac00\uc9c0\ub294 \uc131\uc9c8\uc744 \uac00\ub9ac\ud0a8\ub2e4.<\/p>\n<\/blockquote>\n
\ub9d0\uc774 \ubcf5\uc7a1\ud55c\ub370…
\n\uc790\ubc14\uc5d0\uc11c \ub300\ud45c\uc801\uc73c\ub85c \uc0ac\uc6a9\ub418\ub294 \ub450\uac00\uc9c0 \ucf00\uc774\uc2a4\ub97c \ud655\uc778\ud574 \ubd05\ub2c8\ub2e4.<\/p>\n
\uac1d\uccb4 \ub2e4\ud615\uc131<\/h4>\n
public class CustomerOrder {\n    public void applyCoupon(BonusCoupon coupon) {\n        \/\/ \ucfe0\ud3f0 \uc801\uc6a9\ub85c\uc9c1\n    }\n}\n\nCustomerOrder customerOrder = new CustomerOrder();\nPercentBonusCoupon percentBonusCoupon = new PercentBonusCoupon();\nPriceBonusCoupon priceBonusCoupon = new PriceBonusCoupon();\n\n\/\/ customerOrder.applyCoupon(percentBonusCoupon);\n\/\/ or\ncustomerOrder.applyCoupon(priceBonusCoupon);<\/code><\/pre>\n
\uba54\uc18c\ub4dc\ub97c applyCoupon(BonusCoupon coupon)<\/code> \ub85c \uc9c0\uc815\ud568\uc73c\ub85c \ud574\uc11c,
\nBonusCoupon \uc744 \uc0c1\uc18d\ud558\ub294 \ubaa8\ub4e0 \ud074\ub798\uc2a4\ub97c \ub300\uc785\ud560 \uc218 \uc788\ub294 \uac83\uc744 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\ucd94\uc0c1\ud654\ub97c \uc124\uba85\ud560 \ub54c getDiscountPrice()<\/code> \ub97c \uae30\ub2a5 \uad6c\ud604\ub3c4 \ubabb\ud558\ub294\ub370,
\n\uc65c \uad82\uc774 \ucd94\uac00\ud574 \ub193\uc744\uae4c\uc758 \ub300\ub2f5\uc774 \uc5ec\uae30\uc11c \ub098\uc635\ub2c8\ub2e4.
\n\ucd94\uc0c1 \uba54\uc18c\ub4dc\ub77c\ub3c4 \ucd94\uac00\ud574 \ub193\uc558\uae30 \ub54c\ubb38\uc5d0,
\n\uae08\uc561\ucfe0\ud3f0 \ub610\ub294 \ube44\uc728\ucfe0\ud3f0\uc758 getDiscountPrice() \ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\uac8c \ub429\ub2c8\ub2e4.<\/p>\n
\uc720\uc6a9\ud55c \uae30\ub2a5\uc73c\ub85c, \ub9e4\uc6b0 \ub9ce\uc774 \uc4f0\uc774\ub294 \uc18d\uc131\uc785\ub2c8\ub2e4.<\/p>\n
List<CustomerOrder> customerOrders = new ArrayList<>();<\/code><\/pre>\n
\uc704\uc758 \uacbd\uc6b0\ub3c4 List<\/code> \uc5d0 List \uc758 \ud558\uc704\uac1d\uccb4\uc778 ArrayList<\/code> \ub97c \ub300\uc785\ud558\ub294 \uacbd\uc6b0\uc785\ub2c8\ub2e4.
\n(\uc815\ud655\ud788\ub294 \uc778\ud130\ud398\uc774\uc2a4 \uad6c\ud604\uccb4\uc774\uc9c0\ub9cc)<\/p>\n
\uba54\uc18c\ub4dc \ub2e4\ud615\uc131<\/h4>\n
\uba54\uc18c\ub4dc \ub2e4\ud615\uc131\uc5d0\ub294 \uba54\uc18c\ub4dc \uc624\ubc84\ub85c\ub529, \uba54\uc18c\ub4dc \uc624\ubc84\ub77c\uc774\ub529\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
    \n
  • \n
    \uba54\uc18c\ub4dc \uc624\ubc84\ub85c\ub529<\/p>\n
    \uba54\uc18c\ub4dc\uba85\uc774 \ub3d9\uc77c\ud558\uace0, \ud30c\ub77c\ubbf8\ud130 \ud0c0\uc785(Type)\uc740 \ub2e4\ub978 \uacbd\uc6b0\uc785\ub2c8\ub2e4.
    \nString.valueOf()<\/code> \ucc98\ub7fc \uba54\uc18c\ub4dc\uba85\uc774 \ub3d9\uc77c\ud558\uc9c0\ub9cc, \ud30c\ub77c\ubbf8\ud130 \ud0c0\uc785\uc740 \uc804\ubd80 \ub2e4\ub985\ub2c8\ub2e4.<\/p>\n
    int i = 1;\nString j = new String("2");\nfloat k = 3;\n\nSystem.out.println(String.valueOf(i));\nSystem.out.println(String.valueOf(j));\nSystem.out.println(String.valueOf(k));<\/code><\/pre>\n<\/li>\n
  • \n
    \uba54\uc18c\ub4dc \uc624\ubc84\ub77c\uc774\ub529<\/p>\n
    \uba54\uc18c\ub4dc\uba85\uacfc \ud30c\ub77c\ubbf8\ud130\uac00 \ubaa8\ub450 \ub3d9\uc77c\ud55c \uacbd\uc6b0\uc785\ub2c8\ub2e4.
    \nBigDecimal getDiscountPrice(List items, int index) \ucc98\ub7fc,
    \n\uba54\uc18c\ub4dc\uba85, \ud30c\ub77c\ubbf8\ud130 \ud0c0\uc785, \ub9ac\ud134\uac12 \ubaa8\ub450 \ub3d9\uc77c\ud569\ub2c8\ub2e4.<\/p>\n
    public abstract class BonusCoupon {\n  public abstract BigDecimal getDiscountPrice(List<OrderProduct> items, int index);\n}\n\npublic class PercentBonusCoupon extends BonusCoupon {\n  @Override\n  public BigDecimal getDiscountPrice(List<OrderProduct> items, int index) {\n      \/\/ \ube44\uc728\ucfe0\ud3f0 \uacc4\uc0b0 \ub85c\uc9c1\n      return BigDecimal.ZERO;\n  }\n}<\/code><\/pre>\n<\/li>\n<\/ul>\n
    Generic<\/h2>\n
    \ud074\ub798\uc2a4\ub97c \ud30c\ub77c\ubbf8\ud130\ub85c \ubc1b\uc744 \uc218 \uc788\ub294 \uae30\ub2a5\uc785\ub2c8\ub2e4.<\/p>\n
    List<CustomerOrder> customerOrders = new ArrayList<>();<\/code><\/pre>\n
    Generic \uc774 \uc5c6\ub2e4\uba74?<\/p>\n
    StringList stringList = new StringList();\nIntegerList integerList = new IntegerList();\nCustomerOrderList customerOrderList = new CustomerOrderList();\n\/\/ ......<\/code><\/pre>\n
    \uac01\uac01\uc758 \uac1d\uccb4\uc5d0 \ub300\ud574 \uac01\uac01\uc758 List \ud074\ub798\uc2a4\ub97c \uc0dd\uc131\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n
    public interface List<E> extends Collection<E> {\n    int size();\n    boolean isEmpty();\n    boolean contains(Object o);\n    \/\/ ......\n}<\/code><\/pre>\n
    \ub610\ud55c, List \uc5d0\uc11c \uae30\ubcf8\uc801\uc73c\ub85c \ud544\uc694\ud55c \uba54\uc18c\ub4dc\ub4e4\uc744 \uac01\uac01\uc758 \ud074\ub798\uc2a4\uc5d0 \uad6c\ud604\ud574 \uc8fc\uc5b4\uc57c \ud558\uace0,
    \n\ucf54\ub4dc\uc911\ubcf5\uc774 \ubc1c\uc0dd\ud560 \uc218\ubc16\uc5d0 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n
    import org.mapstruct.BeanMapping;\nimport org.mapstruct.MappingTarget;\nimport org.mapstruct.NullValuePropertyMappingStrategy;\n\npublic interface GenericMapper<D, E> {\n\n    D toDto(E e);\n    E toEntity(D d);\n\n    @BeanMapping(nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE)\n    void updateFromDto(D dto, @MappingTarget E entity);\n}<\/code><\/pre>\n
    \uc704\uc640 \uac19\uc774 Generic interface \ub97c \uc0dd\uc131\ud574 \uc900 \uacbd\uc6b0,
    \n\uc544\ub798\uc640 \uac19\uc774 \ud074\ub798\uc2a4 \ud30c\ub77c\ubbf8\ud130\ub97c \uc9c0\uc815\ud574 \uc8fc\ub294\uac83\ub9cc\uc73c\ub85c \ucf54\ub529\uc774 \ub05d\ub0a9\ub2c8\ub2e4.<\/p>\n
    @Mapper(componentModel = "spring", unmappedTargetPolicy = ReportingPolicy.IGNORE)\npublic interface UserInfoMapper extends GenericMapper<UserInfoDto, UserInfo> {\n}<\/code><\/pre>\n
    \uba54\uc18c\ub4dc \ub4f1\uc5d0\ub3c4 \ud074\ub798\uc2a4 \ud30c\ub77c\ubbf8\ud130\ub97c \uc9c0\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.
    \nabstract<\/code> \ub85c \uc9c0\uc815\ud55c \uba54\uc18c\ub4dc \uc774\uc678\uc5d0\ub294 \ucf54\ub4dc\uac00 \uc790\ub3d9\uc0dd\uc131\ub418\ubbc0\ub85c,
    \n\ubcc4\ub3c4\uc758 \ucf54\ub529\uc774 \ud544\uc694\uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n
    \/**\n *\n * CustomGenericService - \uc11c\ube44\uc2a4\uc758 \uacf5\ud1b5 \uae30\ub2a5 \ucd94\uc0c1\ud654(CRUD)\n * \uc7ac\uc815\uc758\uac00 \ud544\uc694\ud55c \uae30\ub2a5\uc740 @Override\ud574\uc11c \uc0ac\uc6a9\ud560\uac83\n *\n * @author skyer9@gmail.com\n *\n * @param <D> DTO Type\n * @param <E> Entity Type\n * @param <KD> Key DTO Type\n * @param <KE> Key Entity type\n *\/\n\npublic abstract class CustomGenericService<D, E, KD, KE> {\n\n    protected JpaRepository<E, KE> repository;\n    protected final String title;\n\n    public CustomGenericService(JpaRepository<E, KE> repository, String title) {\n\n        this.repository = repository;\n        this.title = title;\n    }\n\n    \/\/ \uc0dd\uc131\n    @Transactional\n    public D create(D d) {\n\n        E e = newEntity();\n        updateFromDto(d, e);\n\n        return toDto(repository.save(e));\n    }\n\n    \/\/ \uccb4\ud06c \ubc0f \uc0dd\uc131\n    @Transactional\n    public D create(KD id, D d) throws DataExistsException {\n\n        KE ke = toKeyEntity(id);\n\n        if (get(ke, false) != null) {\n            throw new DataExistsException(title + "\uc774(\uac00) \uc774\ubbf8 \uc874\uc7ac\ud569\ub2c8\ub2e4.");\n        }\n\n        E e = newEntity(ke);\n        updateFromDto(d, e);\n\n        return toDto(repository.save(e));\n    }\n\n    \/\/ \uc218\uc815\n    @Transactional\n    public void update(KD id, D d) {\n\n        E e = get(toKeyEntity(id), true);\n        updateFromDto(d, e);\n        repository.save(e);\n    }\n\n    \/\/ \uc218\uc815 \ub610\ub294 \uc0dd\uc131\n    @Transactional\n    public void updateOrCreate(KD id, D d) {\n\n        E e = get(toKeyEntity(id));\n        updateFromDto(d, e);\n        repository.save(e);\n    }\n\n    \/\/ DTO \uc870\ud68c\n    @Transactional(readOnly = true)\n    public D select(KD id) {\n\n        return toDto(get(toKeyEntity(id), true));\n    }\n\n    \/\/ Entity \ubc18\ud658\n    @Transactional\n    public E get(KE id, boolean throwExceptionIfNotExists) {\n\n        E e = repository.findById(id).orElse(null);\n\n        if (throwExceptionIfNotExists && (e == null)) {\n            throw new DataNotFoundException(title + "\uc774(\uac00) \uc874\uc7ac\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.");\n        } else {\n            return e;\n        }\n    }\n\n    @Transactional\n    public E get(KE id) {\n        Optional<E> o = repository.findById(id);\n        return o.orElseGet(() -> newEntity(id));\n    }\n\n    public abstract SearchResponseDto search(Map<String, String> params);\n\n    protected List<D> toDto(List<E> lst) {\n\n        return lst.stream().map(this::toDto).collect(Collectors.toList());\n    }\n\n    protected abstract D toDto(E e);\n    protected abstract E toEntity(D e);\n    \/\/ protected abstract KD toKeyDto(KE e);\n    protected abstract KE toKeyEntity(KD e);\n    protected abstract void updateFromDto(D d, E e);\n    protected abstract E newEntity();\n    protected abstract E newEntity(KE e);\n}<\/code><\/pre>\n
    Collection<\/h2>\n
    API \uc11c\ubc84 \uac1c\ubc1c\uc5d0\ub294 \uc4f0\ub2e4\ubcf4\ub2c8 \ub531 \ub450\uac1c\ub9cc \uc4f0\uac8c \ub418\ub354\uad70\uc694.<\/p>\n
    HashMap<\/h3>\n
    \uc8fc\ub85c URL \ud30c\ub77c\ubbf8\ud130 \uc124\uc815\ud560 \ub54c \uc501\ub2c8\ub2e4.<\/p>\n
    Map<String, String> map = new HashMap<>();\n\nmap.put("searchKeyword", "\uc544\uc774\ud3f0\ucf00\uc774\uc2a4");\nmap.put("pageNumber", "1");\nmap.put("pageSize", "20");\n\nSystem.out.println(map.get("searchKeyword"));<\/code><\/pre>\n
    ArrayList<\/h3>\n
    \uc8fc\ub85c \uac80\uc0c9\uacb0\uacfc\ub97c \ubc18\ud658\ud560 \ub54c \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/p>\n
    List<Object> results = Arrays.asList(toDto(list).toArray());<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
    JAVA OOP, Generic, Collection \ucc38\uc870 \ucc38\uc870 OOP\uc758 \ud2b9\uc9d5 4\uac00\uc9c0 \ucea1\uc290\ud654(Encapsulation) \uad6c\ud604\uc744 \uc678\ubd80\uc5d0 \uc228\uae30\ub294 \uac83\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4. (\ub77c\uace0 \uc368\ub193\uace0 \ub85c\uc9c1\uc744 \ud074\ub798\uc2a4\uc5d0 \ubab0\uc544 \ub123\ub294\ub2e4\ub77c\uace0 \ud574\uc11d\ud569\ub2c8\ub2e4.) public class CustomerOrder { private String cancelyn; public void cancel() { this.cancelyn = "Y"; \/\/ \ub9c8\uc77c\ub9ac\uc9c0 \uad00\ub828 \ub85c\uc9c1 \/\/ \ucfe0\ud3f0 \uad00\ub828 \ub85c\uc9c1 \/\/ \uc7ac\uace0 \uad00\ub828 \ub85c\uc9c1 } } CustomerOrder customerOrder = new CustomerOrder();\u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-4082","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4082","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4082"}],"version-history":[{"count":34,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4082\/revisions"}],"predecessor-version":[{"id":4119,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4082\/revisions\/4119"}],"wp:attachment":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4082"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4082"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4082"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}