{"id":852,"date":"2020-05-22T22:17:28","date_gmt":"2020-05-22T13:17:28","guid":{"rendered":"https:\/\/www.skyer9.pe.kr\/wordpress\/?p=852"},"modified":"2020-05-24T14:58:02","modified_gmt":"2020-05-24T05:58:02","slug":"%ea%b0%9d%ec%b2%b4%ec%a7%80%ed%96%a5-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%98%eb%b0%8dobject-oriented-programming-oop","status":"publish","type":"post","link":"https:\/\/www.skyer9.pe.kr\/wordpress\/?p=852","title":{"rendered":"\uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d(Object-Oriented Programming, OOP)"},"content":{"rendered":"

\uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d(Object-Oriented Programming, OOP)<\/h1>\n

– \uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d\uc774\ub780 \ubb34\uc5c7\uc778\uac00?<\/h2>\n
\n

\uac1d\uccb4 \uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d\uc740 \ucef4\ud4e8\ud130 \ud504\ub85c\uadf8\ub798\ubc0d \ud328\ub7ec\ub2e4\uc784\uc911 \ud558\ub098\ub85c, \ud504\ub85c\uadf8\ub798\ubc0d\uc5d0\uc11c \ud544\uc694\ud55c \ub370\uc774\ud130\ub97c \ucd94\uc0c1\ud654\uc2dc\ucf1c \uc0c1\ud0dc\uc640 \ud589\ub3d9\uc744 \uac00\uc9c4 \uac1d\uccb4\ub97c \ub9cc\ub4e4\uace0 \uadf8 \uac1d\uccb4\ub4e4 \uac04\uc758 \uc720\uae30\uc801\uc778 \uc0c1\ud638\uc791\uc6a9\uc744 \ud1b5\ud574 \ub85c\uc9c1\uc744 \uad6c\uc131\ud558\ub294 \ud504\ub85c\uadf8\ub798\ubc0d \ubc29\ubc95\uc774\ub2e4.<\/p>\n<\/blockquote>\n

\ub77c\uace0 \ud558\ub294\ub370… \ubcf5\uc7a1\ud558\uad70\uc694. \ud558\ub098\uc529 \ud480\uc5b4\ubcf4\ub3c4\ub85d \ud569\ub2c8\ub2e4.<\/p>\n

– \uac1d\uccb4\ub780 \ubb34\uc5c7\uc778\uac00?<\/h2>\n

\uac1d\uccb4<\/h3>\n

\uc77c\ubc18\uc801\uc73c\ub85c \uba85\uc0ac\uac00 \uac1d\uccb4\uac00 \ub429\ub2c8\ub2e4.<\/p>\n

\uc1fc\ud551\ubab0\uc5d0\uc11c, \uace0\uac1d\uc774 \uc0c1\ud488\uc744 \uc7a5\ubc14\uad6c\ub2c8\uc5d0 \ub2f4\ub294\ub2e4<\/code> \ub77c\ub294 \ub85c\uc9c1\uc744 \uad6c\ud604\ud574 \ubd05\ub2c8\ub2e4.<\/p>\n

public class Customer { \/* ... *\/ }\n\npublic class Product { \/* ... *\/ }\n\npublic class ShoppingCart { \/* ... *\/ }\n\npublic class TicketProduct extends Product { \/* ... *\/ }<\/code><\/pre>\n
\uba85\uc0ac\uc778 \uace0\uac1d<\/code>, \uc0c1\ud488<\/code>, \uc7a5\ubc14\uad6c\ub2c8<\/code> \uac00 \uac01\uac01 \uac1d\uccb4\uac00 \ub429\ub2c8\ub2e4.<\/p>\n
\n
\uac1d\uccb4\uc640 \ud074\ub798\uc2a4\uac00 \uc790\uc8fc \uc624\ud574\ub97c \uac00\uc838\uc624\ub294\ub370… \uac04\ub2e8\ud788 \uac1d\uccb4\ub294 \uac1c\ub150\uc774\uace0, \ud074\ub798\uc2a4\ub294 \uc790\ubc14\uc5d0\uc11c \uc0ac\uc6a9\ud558\ub294 \uad6c\ud604\uccb4\uc785\ub2c8\ub2e4. javascript \uac19\uc740 \uacbd\uc6b0 class \uac00 \uc544\ub2c8\ub77c function \uc774 \uac1d\uccb4\uc758 \uae30\ub2a5\uc744 \ud558\uac8c \ub429\ub2c8\ub2e4.<\/p>\n<\/blockquote>\n
\uc0c1\ud0dc\uc640 \ud589\ub3d9<\/h3>\n
\uc0c1\ud0dc\uc640 \ud589\ub3d9\uc744 \uac00\uc9c4 \uac1d\uccb4<\/code> \ub294 \ubb34\uc2a8 \uc758\ubbf8\uc77c\uae4c\uc694?<\/p>\n
\ud589\ub3d9\uc740 \uac1d\uccb4\uc758 \uc874\uc7ac \uc774\uc720\uc785\ub2c8\ub2e4. \uc704\uc5d0\uc11c\ub294 \uc7a5\ubc14\uad6c\ub2c8\uc5d0 \ub2f4\ub294 \uac83<\/code> \uc774 \ud589\ub3d9\uc774 \ub429\ub2c8\ub2e4. \uadf8\ub9ac\uace0, \uc0c1\ud0dc\ub294 \ud589\ub3d9\uc5d0 \uc758\ud574 \ubcc0\uacbd\ub418\ub294 \ub370\uc774\ud0c0\uc758 \ubaa8\uc74c\uc785\ub2c8\ub2e4.<\/p>\n
String userId = "skyer9@gmail.com";\nlong toyId = 11112222;\nlong bookId = 33334444;\nlong ticketId = 55556666;\nLocalDateTime showTime = LocalDateTime.of(2020, 5, 15, 17, 30);\n\nCustomer customer = new Customer(userId);\nProduct toy = new Product(toyId, "\uc7a5\ub09c\uac10", new BigDecimal(5000));\nProduct book = new Product(bookId, "\ucc45", new BigDecimal(20000));\nTicketProduct ticket = new TicketProduct(ticketId, "\ud2f0\ucf13", new BigDecimal(12000), showTime);\n\ncustomer.addToCart(toy);\ncustomer.addToCart(book);\ncustomer.addToCart(ticket);<\/code><\/pre>\n
\uc5ec\uae30\uc11c \uc911\uc694\ud55c \uac83\uc740 \ud589\ub3d9\uc774 \uba3c\uc800\uc774\uace0, \uc0c1\ud0dc\ub294 \ubd80\uc218\uc801\uc778 \uac83\uc774\ub77c\ub294 \uc810\uc785\ub2c8\ub2e4.<\/strong><\/p>\n
addToCart()<\/code> \ub97c \uad6c\ud604\ud558\ub2e4 \ubcf4\ub2c8 Customer<\/code> \uac00 ShoppingCart<\/code> \ub97c \uac00\uc9c0\uace0 \uc788\uc5b4\uc57c \ud558\ub294 \uac83\uc774\uc9c0, \uadf8 \ubc18\ub300\ub294 \uc544\ub2c8\ub77c\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n
– \ucd94\uc0c1\ud654\uc640 \ucea1\uc290\ud654<\/h2>\n
\ucd94\uc0c1\ud654(\uc790\ub8cc\uc758 \ucd94\uc0c1\ud654)<\/h3>\n
\uc704\uc5d0\uc11c Customer<\/code> \uac00 \uc0c1\ud488\uc815\ubcf4\ub97c \uc5b4\ub5a4 \ud615\ud0dc\ub85c \ubcf4\uad00\ud558\uace0 \uc788\ub294\uc9c0\ub294 \ub2e4\ub978 \uac1d\uccb4\ub294 \uc804\ud600 \uc54c \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.(\ubb3c\ub860 \uc54c \ud544\uc694\ub3c4 \uc5c6\uc2b5\ub2c8\ub2e4.)<\/p>\n
\uc774\ub7f0 \ucd94\uc0c1\ud654\uac00 \ubd88\ud3b8\ud574 \ubcf4\uc77c \uc218 \uc788\uc9c0\ub9cc \ucea1\uc290\ud654<\/code> \ub97c \uc124\uba85\ud558\uba74\uc11c \uc65c \uc88b\uc740 \ud2b9\uc9d5\uc774 \ub418\ub294\uc9c0 \uc124\uba85\ud569\ub2c8\ub2e4.<\/p>\n
\ucea1\uc290\ud654<\/h3>\n
\ub370\uc774\ud0c0\uac00 \ucd94\uc0c1\ud654 \ub418\uc5b4 \uc788\uae30 \ub54c\ubb38\uc5d0 Customer<\/code> \uac1d\uccb4\ub294 \ub2e4\ub978 \uac1d\uccb4\ub97c \uc804\ud600 \uace0\ub824\ud558\uc9c0 \uc54a\uace0 \uc790\uc720\ub85c\uc774 \uc0c1\ud488\uc815\ubcf4\uc758 \ubcf4\uad00\ubc29\uc2dd\uc744 \ubcc0\uacbd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
ArrayList<Product><\/code> \uc5d0 \ub9c9\ubc14\ub85c \ubcf4\uad00\ud560 \uc218\ub3c4 \uc788\uace0, ShoppingCart<\/code> \uac1d\uccb4\ub97c \uc0dd\uc131\ud574\uc11c \ubcf4\uad00\ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc18c\uc2a4\uc758 \ubcc0\uacbd\uc774 \ud544\uc694\ud55c \uc2dc\uc810\uc5d0 \uace0\ub824\ud574\uc57c \ud560 \ubc94\uc704\ub97c \uc81c\ud55c\ud560 \uc218 \uc788\ub2e4\ub294 \uac83\uc740 \ub9e4\uc6b0 \uc88b\uc740 \uc7a5\uc810\uc774 \ub429\ub2c8\ub2e4.<\/p>\n
– \uc0c1\uc18d<\/h2>\n
\uc0c1\uc18d\uc740 \ubd80\ubaa8\uac1d\uccb4\uc758 \uc18d\uc131\uacfc \uae30\ub2a5\uc744 \uadf8\ub300\ub85c \uc774\uc5b4\ubc1b\uc544 \uc0ac\uc6a9\ud560 \uc218 \uc788\uac8c\ud558\uace0, \uae30\ub2a5\uc758 \uc77c\ubd80\ubd84\uc744 \ubcc0\uacbd\ud574\uc57c \ud560 \uacbd\uc6b0, \uc0c1\uc18d\ubc1b\uc740 \uc790\uc2dd\ud074\ub798\uc2a4\uc5d0\uc11c \ud574\ub2f9 \uae30\ub2a5\ub9cc \ub2e4\uc2dc \uc218\uc815(\uc815\uc758)\ud558\uc5ec \uc0ac\uc6a9\ud560 \uc218 \uc788\uac8c \ud558\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n
public class TicketProduct extends Product {\n    private LocalDateTime showTime;\n\n    public TicketProduct(long productId, String productName, BigDecimal price, LocalDateTime showTime) {\n        super(productId, productName, price);\n        this.showTime = showTime;\n    }\n}<\/code><\/pre>\n
TicketProduct<\/code> \uc740 Product<\/code> \uc744 \uc0c1\uc18d\ubc1b\uc544 \uacf5\uc5f0\uc2dc\uac04\uc744 \ucd94\uac00\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc0c1\uc18d\uacfc \uc0ac\uc6a9<\/h3>\n
\uc5ec\uae30\uc11c \uad6c\ubd84\ud574\uc57c \ud560 \uac83\uc740 \uc0c1\uc18d<\/code> \uacfc \uc0ac\uc6a9<\/code> \uc785\ub2c8\ub2e4.<\/p>\n
\uac1d\uccb4 \uc790\uccb4\ub97c \ud655\uc7a5\ud574\uc11c \uc4f8 \ub54c\ub294 \uc0c1\uc18d\uc744 \ud574\uc57c\ud558\uace0, \uac1d\uccb4\ub97c \ub2e8\uc9c0 \uc774\uc6a9\ub9cc \ud558\ub294 \uacbd\uc6b0(\uc704\uc5d0\uc11c Customer \uac00 ShoppingCart \ub97c \uc774\uc6a9\ud558\ub294 \uacbd\uc6b0)\ub294 \uc0c1\uc18d\uc774 \uc544\ub2c8\ub77c, \uc18d\uc131\uc5d0 \uac1d\uccb4\ub97c \ucd94\uac00\ud574\uc11c \uc0ac\uc6a9\ud558\uae30\ub9cc \ud558\uba74 \ub429\ub2c8\ub2e4.<\/p>\n
\uc0c1\uc18d(extends) \uacfc \uc778\ud130\ud398\uc774\uc2a4(interface)<\/h3>\n
\uc0c1\uc18d\uacfc \uc720\uc0ac\ud558\uc9c0\ub9cc \uad6c\ubcc4\ub418\ub294 \uac83\uc774 interface<\/code> \uc785\ub2c8\ub2e4. \uc0c1\uc18d\uc740 \ucf54\ub4dc\ub97c \uacf5\uc720\ud558\uc9c0\ub9cc, interface \ub294 \ucf54\ub4dc\uc758 \uacf5\uc720\uac00 \uc804\ud600 \uc5c6\ub294 \uac83\uc774 \ucc28\uc774\uc810\uc785\ub2c8\ub2e4.<\/p>\n
– \ub2e4\ud615\uc131<\/h2>\n
\uc624\ubc84\ub77c\uc774\ub529(Overriding)<\/h3>\n
\ubd80\ubaa8 \uac1d\uccb4\uc758 \uba54\uc18c\ub4dc\ub97c \uc7ac\uc815\uc758\ud558\ub294 \uac83\uc744 \ub9d0\ud569\ub2c8\ub2e4.<\/p>\n
public class Money {\n    \/\/ ...\n    @Override\n    public String toString() {\n        return "wallet.Money{" +\n                "amount=" + amount +\n                ", currencyCode='" + currencyCode + '\\'' +\n                '}';\n    }\n}\n\npublic class Mileage extends Money {\n    \/\/ ...\n    @Override\n    public String toString() {\n        return "wallet.Mileage{" +\n                "amount=" + this.getAmount() +\n                ", currencyCode='" + this.getCurrencyCode() + '\\'' +\n                '}';\n    }\n}<\/code><\/pre>\n
\uc624\ubc84\ub85c\ub529(Overloading)<\/h3>\n
\ub3d9\uc77c\ud55c \uba54\uc18c\ub4dc\uba85\uc73c\ub85c, \uc11c\ub85c \ub2e4\ub978 \ud0c0\uc785 \ub610\ub294 \uac2f\uc218\uc758 \ud30c\ub77c\ubbf8\ud130\ub97c \ubc1b\ub294 \uac83\uc744 \ub9d0\ud569\ub2c8\ub2e4.<\/p>\n
public class Money {\n    \/\/ ...\n\n    public Money add(Money _amount) {\n        \/\/ ...\n    }\n\n    public Money add(long _amount) {\n        \/\/ ...\n    }\n\n    public Money add(BigDecimal _amount) {\n        \/\/ ...\n    }\n    \/\/ ...\n}<\/code><\/pre>\n
\uc704\uc5d0\uc11c \ubcf4\uba74 add()<\/code> \ud568\uc218\ub294 \uc5ec\ub7ec \ud30c\ub77c\ubbf8\ud130\ub97c \ubc1b\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"
\uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d(Object-Oriented Programming, OOP) – \uac1d\uccb4\uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d\uc774\ub780 \ubb34\uc5c7\uc778\uac00? \uac1d\uccb4 \uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d\uc740 \ucef4\ud4e8\ud130 \ud504\ub85c\uadf8\ub798\ubc0d \ud328\ub7ec\ub2e4\uc784\uc911 \ud558\ub098\ub85c, \ud504\ub85c\uadf8\ub798\ubc0d\uc5d0\uc11c \ud544\uc694\ud55c \ub370\uc774\ud130\ub97c \ucd94\uc0c1\ud654\uc2dc\ucf1c \uc0c1\ud0dc\uc640 \ud589\ub3d9\uc744 \uac00\uc9c4 \uac1d\uccb4\ub97c \ub9cc\ub4e4\uace0 \uadf8 \uac1d\uccb4\ub4e4 \uac04\uc758 \uc720\uae30\uc801\uc778 \uc0c1\ud638\uc791\uc6a9\uc744 \ud1b5\ud574 \ub85c\uc9c1\uc744 \uad6c\uc131\ud558\ub294 \ud504\ub85c\uadf8\ub798\ubc0d \ubc29\ubc95\uc774\ub2e4. \ub77c\uace0 \ud558\ub294\ub370… \ubcf5\uc7a1\ud558\uad70\uc694. \ud558\ub098\uc529 \ud480\uc5b4\ubcf4\ub3c4\ub85d \ud569\ub2c8\ub2e4. – \uac1d\uccb4\ub780 \ubb34\uc5c7\uc778\uac00? \uac1d\uccb4 \uc77c\ubc18\uc801\uc73c\ub85c \uba85\uc0ac\uac00 \uac1d\uccb4\uac00 \ub429\ub2c8\ub2e4. \uc1fc\ud551\ubab0\uc5d0\uc11c, \uace0\uac1d\uc774 \uc0c1\ud488\uc744 \uc7a5\ubc14\uad6c\ub2c8\uc5d0 \ub2f4\ub294\ub2e4 \ub77c\ub294 \ub85c\uc9c1\uc744\u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-852","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\/852","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=852"}],"version-history":[{"count":18,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/852\/revisions"}],"predecessor-version":[{"id":883,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/852\/revisions\/883"}],"wp:attachment":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=852"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=852"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=852"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}