{"id":30523,"date":"2024-10-28T03:51:00","date_gmt":"2024-10-28T03:51:00","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=30523"},"modified":"2024-11-26T06:48:19","modified_gmt":"2024-11-26T06:48:19","slug":"%ec%bd%94%ed%8b%80%eb%a6%b0-%ec%95%88%eb%93%9c%eb%a1%9c%ec%9d%b4%eb%93%9c-%ec%95%b1%ea%b0%9c%eb%b0%9c-%ea%b0%95%ec%a2%8c-%ec%bd%94%ed%8b%80%eb%a6%b0-%eb%84%90-%ec%95%88%ec%a0%84%ec%84%b1","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/30523\/","title":{"rendered":"\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \ucf54\ud2c0\ub9b0, \ub110 \uc548\uc804\uc131"},"content":{"rendered":"

<\/p>\n

\ucf54\ud2c0\ub9b0\uc758 \ub110 \uc548\uc804\uc131<\/h2>\n

\ucf54\ud2c0\ub9b0(Kotlin)\uc740 \ud604\uc7ac \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0 \ub110\ub9ac \uc0ac\uc6a9\ub418\ub294 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\ub85c, \uc790\ubc14\uc758 \ub2e8\uc810\uc744 \ubcf4\uc644\ud558\uace0 \ub354 \uc548\uc804\ud55c \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc788\ub3c4\ub85d \uc124\uacc4\ub418\uc5c8\uc2b5\ub2c8\ub2e4. \uadf8 \uc911\uc5d0\uc11c\ub3c4 \ub110 \uc548\uc804\uc131(null safety)\uc740 \ucf54\ud2c0\ub9b0\uc758 \uac00\uc7a5 \ud070 \uc7a5\uc810 \uc911 \ud558\ub098\ub85c, \uac1c\ubc1c\uc790\uac00 \ub110 \ud3ec\uc778\ud130 \uc608\uc678(NullPointerException)\uc5d0 \ub300\ud55c \uac71\uc815 \uc5c6\uc774 \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc788\uac8c \ub3c4\uc640\uc90d\ub2c8\ub2e4.<\/p>\n

\ub110 \ud3ec\uc778\ud130 \uc608\uc678\ub780?<\/h3>\n

\ub110 \ud3ec\uc778\ud130 \uc608\uc678\ub294 \ud504\ub85c\uadf8\ub7a8\uc774 `null` \uac1d\uccb4\uc5d0 \uc811\uadfc\ud558\ub824\uace0 \ud560 \ub54c \ubc1c\uc0dd\ud569\ub2c8\ub2e4. \uc790\ubc14\uc5d0\uc11c\ub294 `null` \uac12\uc744 \ud560\ub2f9\ubc1b\uc744 \uc218 \uc788\ub294 \ubcc0\uc218\ub4e4\uc774 \ub9ce\uc544 \ud504\ub85c\uadf8\ub7a8\uc5d0\uc11c \uc790\uc8fc \ubc1c\uc0dd\ud558\uba70, \uc774\ub294 \uce58\uba85\uc801\uc778 \uc624\ub958\ub97c \ucd08\ub798\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4:<\/p>\n

\n    String str = null;\n    int length = str.length(); \/\/ \uc774 \uc904\uc5d0\uc11c NullPointerException \ubc1c\uc0dd\n    <\/code><\/pre>\n
\ucf54\ud2c0\ub9b0\uc758 \ub110 \uc548\uc804\uc131<\/h3>\n
\ucf54\ud2c0\ub9b0\uc5d0\uc11c\ub294 \ubcc0\uc218\uac00 \ub110(null)\uc744 \uac00\uc9c8 \uc218 \uc788\ub294\uc9c0 \uc5ec\ubd80\ub97c \uba85\uc2dc\uc801\uc73c\ub85c \uc815\uc758\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uae30\ubcf8\uc801\uc73c\ub85c \ubaa8\ub4e0 \ubcc0\uc218\uac00 \ub110\uc774 \uc544\ub2d0 \uc218 \uc788\ub3c4\ub85d \uc124\uc815\ub418\uba70, \ub110\uc744 \ud5c8\uc6a9\ud558\ub824\uba74 \ubcc4\ub3c4\uc758 \uad6c\ubb38\uc744 \uc0ac\uc6a9\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n
\ub110\uc744 \ud5c8\uc6a9\ud558\ub294 \ubcc0\uc218 \uc120\uc5b8<\/h4>\n
\ub110\uc744 \ud5c8\uc6a9\ud558\ub824\uba74 \ubcc0\uc218 \ud0c0\uc785\uc5d0 ?<\/code> \uae30\ud638\ub97c \ucd94\uac00\ud569\ub2c8\ub2e4. \uc608:<\/p>\n
\n    var name: String? = null  \/\/ \ub110\uc744 \ud5c8\uc6a9\ud558\ub294 String \ubcc0\uc218\n    <\/code><\/pre>\n
\ub110 \uc548\uc804\ud55c \ud638\ucd9c(?.)\uacfc \uc5d8\ube44\uc2a4 \uc5f0\uc0b0\uc790(?:)<\/h4>\n
\ucf54\ud2c0\ub9b0\uc5d0\uc11c\ub294 \ub110 \uc548\uc804\ud55c \ud638\ucd9c\uc744 \uc704\ud574 ?.<\/code> \uc5f0\uc0b0\uc790\ub97c \uc0ac\uc6a9\ud558\uc5ec \uac1d\uccb4\uac00 \ub110\uc778\uc9c0 \ud655\uc778\ud55c \ud6c4 \uba54\uc11c\ub4dc\ub97c \ud638\ucd9c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub9cc\uc57d \uac1d\uccb4\uac00 \ub110\uc774\uba74, \uba54\uc11c\ub4dc\ub294 \ud638\ucd9c\ub418\uc9c0 \uc54a\uace0 \ub110\uc744 \ubc18\ud658\ud569\ub2c8\ub2e4.<\/p>\n
\uc608\ub97c \ub4e4\uc5b4:<\/p>\n
\n    var name: String? = null\n    println(name?.length)  \/\/ \ucd9c\ub825: null\n    <\/code><\/pre>\n
\ub610\ud55c, \uc5d8\ube44\uc2a4 \uc5f0\uc0b0\uc790(?:<\/code>)\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub110\uc77c \uacbd\uc6b0 \uae30\ubcf8\uac12\uc744 \uc81c\uacf5\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n
\n    var length = name?.length ?: 0  \/\/ \ub9cc\uc57d name\uc774 null\uc774\ub77c\uba74, length\ub294 0\n    println(length)  \/\/ \ucd9c\ub825: 0\n    <\/code><\/pre>\n
\ucf54\ud2c0\ub9b0\uc5d0\uc11c \ub110 \uc548\uc804\uc131\uc744 \ud65c\uc6a9\ud55c \uac04\ub2e8\ud55c \uc608\uc81c<\/h3>\n
\uc774\ubc88\uc5d0\ub294 \ucf54\ud2c0\ub9b0\uc744 \uc0ac\uc6a9\ud55c \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0\uc11c \ub110 \uc548\uc804\uc131\uc744 \ud65c\uc6a9\ud558\ub294 \ubc29\ubc95\uc744 \ubcf4\uc5ec\uc8fc\ub294 \uc608\uc81c\ub97c \uc791\uc131\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \uac04\ub2e8\ud55c \uc0ac\uc6a9\uc790 \uc815\ubcf4\ub97c \uc785\ub825\ubc1b\ub294 \uc571\uc744 \ub9cc\ub4e4\uc5b4 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
\ud504\ub85c\uc81d\ud2b8 \uc124\uc815<\/h4>\n
\uc548\ub4dc\ub85c\uc774\ub4dc \uc2a4\ud29c\ub514\uc624\ub97c \uc5f4\uace0 \uc0c8 \ud504\ub85c\uc81d\ud2b8\ub97c \ub9cc\ub4ed\ub2c8\ub2e4. “Empty Activity” \ud15c\ud50c\ub9bf\uc744 \uc120\ud0dd\ud558\uace0, \ucf54\ud2c0\ub9b0\uc744 \uc120\ud0dd\ud569\ub2c8\ub2e4. \ud504\ub85c\uc81d\ud2b8 \uc774\ub984\uc740 “UserInputApp”\uc73c\ub85c \uc124\uc815\ud569\ub2c8\ub2e4.<\/p>\n
\ub808\uc774\uc544\uc6c3 \ud30c\uc77c \uc218\uc815<\/h4>\n
\ud504\ub85c\uc81d\ud2b8\uc758 res\/layout\/activity_main.xml<\/code> \ud30c\uc77c\uc744 \uc5f4\uace0 \ub2e4\uc74c\uacfc \uac19\uc774 \uc218\uc815\ud569\ub2c8\ub2e4:<\/p>\n
\n    <LinearLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\n        android:layout_width=\"match_parent\"\n        android:layout_height=\"match_parent\"\n        android:orientation=\"vertical\"\n        android:padding=\"16dp\">\n\n        <EditText\n            android:id=\"@+id\/editTextName\"\n            android:layout_width=\"match_parent\"\n            android:layout_height=\"wrap_content\"\n            android:hint=\"\uc774\ub984\uc744 \uc785\ub825\ud558\uc138\uc694\" \/>\n\n        <Button\n            android:id=\"@+id\/buttonSubmit\"\n            android:layout_width=\"wrap_content\"\n            android:layout_height=\"wrap_content\"\n            android:text=\"\uc81c\ucd9c\" \/>\n\n        <TextView\n            android:id=\"@+id\/textViewResult\"\n            android:layout_width=\"wrap_content\"\n            android:layout_height=\"wrap_content\"\n            android:layout_marginTop=\"16dp\" \/>\n\n    <\/LinearLayout>\n    <\/code><\/pre>\n
\uba54\uc778 \uc561\ud2f0\ube44\ud2f0 \ucf54\ub4dc \uc791\uc131<\/h4>\n
\uc774\uc81c MainActivity.kt<\/code> \ud30c\uc77c\uc744 \uc5f4\uace0 \ub2e4\uc74c \ucf54\ub4dc\ub97c \uc791\uc131\ud569\ub2c8\ub2e4:<\/p>\n
\n    package com.example.userinputapp\n\n    import android.os.Bundle\n    import android.view.View\n    import android.widget.Button\n    import android.widget.EditText\n    import android.widget.TextView\n    import androidx.appcompat.app.AppCompatActivity\n\n    class MainActivity : AppCompatActivity() {\n        private lateinit var editTextName: EditText\n        private lateinit var buttonSubmit: Button\n        private lateinit var textViewResult: TextView\n\n        override fun onCreate(savedInstanceState: Bundle?) {\n            super.onCreate(savedInstanceState)\n            setContentView(R.layout.activity_main)\n\n            editTextName = findViewById(R.id.editTextName)\n            buttonSubmit = findViewById(R.id.buttonSubmit)\n            textViewResult = findViewById(R.id.textViewResult)\n\n            buttonSubmit.setOnClickListener {\n                val name: String? = editTextName.text.toString().takeIf { it.isNotEmpty() }\n                textViewResult.text = \"\uc785\ub825\ud55c \uc774\ub984: ${name ?: \"\uc774\ub984\uc774 \uc5c6\uc2b5\ub2c8\ub2e4.\"}\"\n            }\n        }\n    }\n    <\/code><\/pre>\n
\uacb0\ub860<\/h3>\n
\ucf54\ud2c0\ub9b0\uc758 \ub110 \uc548\uc804\uc131\uc740 \uac1c\ubc1c\uc790\uac00 \ucf54\ub4dc \uc791\uc131 \uc2dc \ubd88\ud544\uc694\ud55c \uc624\ub958\ub97c \uc904\uc774\uace0, \ub354 \uc548\uc804\ud55c \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc788\ub3c4\ub85d \ub3d5\uc2b5\ub2c8\ub2e4. \uc704\uc758 \uc608\uc81c\ub97c \ud1b5\ud574 \ub110 \uc548\uc804\uc131\uc758 \uc774\uc810\uc744 \uc0b4\ud3b4\ubcf4\uc558\uc73c\uba70, \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c \uc2dc \ub110\uc744 \ud6a8\uacfc\uc801\uc73c\ub85c \ucc98\ub9ac\ud558\ub294 \ubc29\ubc95\uc744 \uc775\ud790 \uc218 \uc788\uc5c8\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c \uac15\uc88c\uc5d0\uc11c\ub294 \ucf54\ud2c0\ub9b0\uc758 \uace0\uae09 \uae30\ub2a5 \ubc0f \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc758 \ub2e4\ub978 \uce21\uba74\uc744 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4!<\/p>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
\ucf54\ud2c0\ub9b0\uc758 \ub110 \uc548\uc804\uc131 \ucf54\ud2c0\ub9b0(Kotlin)\uc740 \ud604\uc7ac \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0 \ub110\ub9ac \uc0ac\uc6a9\ub418\ub294 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\ub85c, \uc790\ubc14\uc758 \ub2e8\uc810\uc744 \ubcf4\uc644\ud558\uace0 \ub354 \uc548\uc804\ud55c \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc788\ub3c4\ub85d \uc124\uacc4\ub418\uc5c8\uc2b5\ub2c8\ub2e4. \uadf8 \uc911\uc5d0\uc11c\ub3c4 \ub110 \uc548\uc804\uc131(null safety)\uc740 \ucf54\ud2c0\ub9b0\uc758 \uac00\uc7a5 \ud070 \uc7a5\uc810 \uc911 \ud558\ub098\ub85c, \uac1c\ubc1c\uc790\uac00 \ub110 \ud3ec\uc778\ud130 \uc608\uc678(NullPointerException)\uc5d0 \ub300\ud55c \uac71\uc815 \uc5c6\uc774 \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc788\uac8c \ub3c4\uc640\uc90d\ub2c8\ub2e4. \ub110 \ud3ec\uc778\ud130 \uc608\uc678\ub780? \ub110 \ud3ec\uc778\ud130 \uc608\uc678\ub294 \ud504\ub85c\uadf8\ub7a8\uc774 `null` \uac1d\uccb4\uc5d0 \uc811\uadfc\ud558\ub824\uace0 … \ub354 \ubcf4\uae30 “\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \ucf54\ud2c0\ub9b0, \ub110 \uc548\uc804\uc131”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[35],"tags":[],"class_list":["post-30523","post","type-post","status-publish","format-standard","hentry","category-35"],"yoast_head":"\n\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \ucf54\ud2c0\ub9b0, \ub110 \uc548\uc804\uc131 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atmokpo.com\/w\/30523\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \ucf54\ud2c0\ub9b0, \ub110 \uc548\uc804\uc131 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"\ucf54\ud2c0\ub9b0\uc758 \ub110 \uc548\uc804\uc131 \ucf54\ud2c0\ub9b0(Kotlin)\uc740 \ud604\uc7ac \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0 \ub110\ub9ac \uc0ac\uc6a9\ub418\ub294 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\ub85c, \uc790\ubc14\uc758 \ub2e8\uc810\uc744 \ubcf4\uc644\ud558\uace0 \ub354 \uc548\uc804\ud55c \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc788\ub3c4\ub85d \uc124\uacc4\ub418\uc5c8\uc2b5\ub2c8\ub2e4. \uadf8 \uc911\uc5d0\uc11c\ub3c4 \ub110 \uc548\uc804\uc131(null safety)\uc740 \ucf54\ud2c0\ub9b0\uc758 \uac00\uc7a5 \ud070 \uc7a5\uc810 \uc911 \ud558\ub098\ub85c, \uac1c\ubc1c\uc790\uac00 \ub110 \ud3ec\uc778\ud130 \uc608\uc678(NullPointerException)\uc5d0 \ub300\ud55c \uac71\uc815 \uc5c6\uc774 \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc788\uac8c \ub3c4\uc640\uc90d\ub2c8\ub2e4. \ub110 \ud3ec\uc778\ud130 \uc608\uc678\ub780? \ub110 \ud3ec\uc778\ud130 \uc608\uc678\ub294 \ud504\ub85c\uadf8\ub7a8\uc774 `null` \uac1d\uccb4\uc5d0 \uc811\uadfc\ud558\ub824\uace0 … \ub354 \ubcf4\uae30 "\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \ucf54\ud2c0\ub9b0, \ub110 \uc548\uc804\uc131"\" \/>\n<meta property=\"og:url\" content=\"https:\/\/atmokpo.com\/w\/30523\/\" \/>\n<meta property=\"og:site_name\" content=\"\ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"article:published_time\" content=\"2024-10-28T03:51:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-26T06:48:19+00:00\" \/>\n<meta name=\"author\" content=\"root\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@bebubo4\" \/>\n<meta name=\"twitter:site\" content=\"@bebubo4\" \/>\n<meta name=\"twitter:label1\" content=\"\uae00\uc4f4\uc774\" \/>\n\t<meta name=\"twitter:data1\" content=\"root\" \/>\n\t<meta name=\"twitter:label2\" content=\"\uc608\uc0c1 \ub418\ub294 \ud310\ub3c5 \uc2dc\uac04\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\ubd84\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/atmokpo.com\/w\/30523\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/atmokpo.com\/w\/30523\/\"},\"author\":{\"name\":\"root\",\"@id\":\"https:\/\/atmokpo.com\/w\/#\/schema\/person\/91b6b3b138fbba0efb4ae64b1abd81d7\"},\"headline\":\"\ucf54\ud2c0\ub9b0 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uac1c\ubc1c \uac15\uc88c, \ucf54\ud2c0\ub9b0, \ub110 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