\uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0 \uc788\uc5b4 \uc790\ubc14\ub294 \uc5ec\uc804\ud788 \uc911\uc694\ud55c \uc5b8\uc5b4 \uc911 \ud558\ub098\uc785\ub2c8\ub2e4. \uc774 \uae00\uc5d0\uc11c\ub294 \uc790\ubc14\uc758 \ud074\ub798\uc2a4 \uc885\ub958\uc640 \uadf8\uac83\ub4e4\uc774 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uc5d0\uc11c \uc5b4\ub5bb\uac8c \ud65c\uc6a9\ub418\ub294\uc9c0\ub97c \ub2e4\ub8e8\uaca0\uc2b5\ub2c8\ub2e4. \uc790\ubc14\ub294 \uac1d\uccb4 \uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d(OOP) \uc5b8\uc5b4\ub85c, \ud074\ub798\uc2a4\uc640 \uac1d\uccb4\ub97c \uae30\ubcf8 \uac1c\ub150\uc73c\ub85c \ud569\ub2c8\ub2e4. \ud074\ub798\uc2a4\ub294 \uac1d\uccb4\ub97c \uc0dd\uc131\ud558\uae30 \uc704\ud55c \uccad\uc0ac\uc9c4(\uc124\uacc4\ub3c4)\uc774\uba70, \uac1d\uccb4\ub294 \ud074\ub798\uc2a4\uc758 \uc778\uc2a4\ud134\uc2a4\uc785\ub2c8\ub2e4.<\/p>\n
\uc790\ubc14\uc5d0\uc11c \ud074\ub798\uc2a4\ub294 \ubcc0\uc218\uc640 \uba54\uc18c\ub4dc\ub97c \ud3ec\ud568\ud560 \uc218 \uc788\ub294 \ub370\uc774\ud130 \uad6c\uc870\uccb4\uc785\ub2c8\ub2e4. \ud074\ub798\uc2a4\uc758 \uc8fc\uc694 \uad6c\uc131 \uc694\uc18c\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n
\ub2e4\uc74c\uc740 \uc790\ubc14 \ud074\ub798\uc2a4\ub97c \uc815\uc758\ud558\ub294 \uae30\ubcf8\uc801\uc778 \uc608\uc785\ub2c8\ub2e4:<\/p>\n
public class Dog {\n \/\/ \uc18d\uc131\n String name;\n int age;\n\n \/\/ \uc0dd\uc131\uc790\n public Dog(String name, int age) {\n this.name = name;\n this.age = age;\n }\n\n \/\/ \uba54\uc18c\ub4dc\n public void bark() {\n System.out.println(name + \"\uc774(\uac00) \uc9d6\uc2b5\ub2c8\ub2e4.\");\n }\n}<\/code><\/pre>\n2. \uc790\ubc14\uc758 \ud074\ub798\uc2a4 \uc885\ub958<\/h2>\n
\uc790\ubc14\uc5d0\uc11c\ub294 \ub2e4\uc591\ud55c \uc885\ub958\uc758 \ud074\ub798\uc2a4\ub97c \uc815\uc758\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc8fc\uc694 \ud074\ub798\uc2a4 \uc885\ub958\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n
2.1. \uac1d\uccb4 \ud074\ub798\uc2a4 (Object Class)<\/h3>\n
\uc790\ubc14\uc758 \ubaa8\ub4e0 \ud074\ub798\uc2a4\ub294 Object<\/code> \ud074\ub798\uc2a4\ub97c \uc0c1\uc18d\ubc1b\uc2b5\ub2c8\ub2e4. \ub530\ub77c\uc11c Object<\/code> \ud074\ub798\uc2a4\ub294 \uc790\ubc14\uc758 \ucd5c\uc0c1\uc704 \ubd80\ubaa8 \ud074\ub798\uc2a4\uc785\ub2c8\ub2e4. \ubaa8\ub4e0 \ud074\ub798\uc2a4\uc5d0\uc11c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \uae30\ubcf8 \uba54\uc18c\ub4dc(\uc608: toString()<\/code>, equals()<\/code>, hashCode()<\/code>)\uac00 \ud3ec\ud568\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n2.2. \uc0ac\uc6a9\uc790 \uc815\uc758 \ud074\ub798\uc2a4 (User-defined Class)<\/h3>\n
\uac1c\ubc1c\uc790\uac00 \uc790\uc2e0\uc758 \ud544\uc694\uc5d0 \ub9de\uac8c \uc815\uc758\ud55c \ud074\ub798\uc2a4\ub97c \uc0ac\uc6a9\uc790 \uc815\uc758 \ud074\ub798\uc2a4\ub77c\uace0 \ud569\ub2c8\ub2e4. \uc704\uc5d0\uc11c \uc124\uba85\ud55c Dog<\/code> \ud074\ub798\uc2a4\uac00 \uadf8 \uc608\uc785\ub2c8\ub2e4.<\/p>\n2.3. \ucd94\uc0c1 \ud074\ub798\uc2a4 (Abstract Class)<\/h3>\n
\ucd94\uc0c1 \ud074\ub798\uc2a4\ub294 \ud558\ub098 \uc774\uc0c1\uc758 \ucd94\uc0c1 \uba54\uc18c\ub4dc\ub97c \ud3ec\ud568\ud558\ub294 \ud074\ub798\uc2a4\uc785\ub2c8\ub2e4. \ucd94\uc0c1 \uba54\uc18c\ub4dc\ub294 \uad6c\ud604\uc774 \uc5c6\ub294 \uba54\uc18c\ub4dc\ub85c, \ud574\ub2f9 \ud074\ub798\uc2a4\ub97c \uc0c1\uc18d\ud55c \ud558\uc704 \ud074\ub798\uc2a4\uc5d0\uc11c \ubc18\ub4dc\uc2dc \uad6c\ud604\ud574\uc57c \ud569\ub2c8\ub2e4. \ucd94\uc0c1 \ud074\ub798\uc2a4\ub294 \uc778\uc2a4\ud134\uc2a4\ub97c \uc0dd\uc131\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n
abstract class Animal {\n abstract void sound();\n\n void eat() {\n System.out.println(\"Animal is eating\");\n }\n}\n\nclass Cat extends Animal {\n void sound() {\n System.out.println(\"\uc57c\uc639\");\n }\n}<\/code><\/pre>\n2.4. \uc778\ud130\ud398\uc774\uc2a4 (Interfaces)<\/h3>\n
\uc778\ud130\ud398\uc774\uc2a4\ub294 \uba54\uc18c\ub4dc\uc758 \uc815\uc758\ub9cc \ud3ec\ud568\ud558\uace0, \ud574\ub2f9 \uba54\uc18c\ub4dc\ub97c \uad6c\ud604\ud558\ub294 \ud074\ub798\uc2a4\ub97c \uc694\uad6c\ud569\ub2c8\ub2e4. \uc778\ud130\ud398\uc774\uc2a4\ub294 \ub2e4\uc911 \uc0c1\uc18d\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4. \uc989, \ud074\ub798\uc2a4\ub294 \uc5ec\ub7ec \uac1c\uc758 \uc778\ud130\ud398\uc774\uc2a4\ub97c \uad6c\ud604\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
interface Flyable {\n void fly();\n}\n\nclass Bird implements Flyable {\n public void fly() {\n System.out.println(\"\uc0c8\uac00 \ub098\ub294 \uc911\uc785\ub2c8\ub2e4.\");\n }\n}<\/code><\/pre>\n2.5. \ub0b4\uc7a5 \ud074\ub798\uc2a4 (Inner Class)<\/h3>\n
\ub0b4\uc7a5 \ud074\ub798\uc2a4\ub294 \ub2e4\ub978 \ud074\ub798\uc2a4\uc758 \uba64\ubc84\ub85c \uc815\uc758\ub41c \ud074\ub798\uc2a4\ub97c \ub9d0\ud569\ub2c8\ub2e4. Inner Class\ub294 \uc678\ubd80 \ud074\ub798\uc2a4\uc758 \uba64\ubc84\uc5d0 \uc811\uadfc\ud560 \uc218 \uc788\ub294 \uae30\ub2a5\uc744 \uac00\uc9c0\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
class Outer {\n class Inner {\n void display() {\n System.out.println(\"\uc774\ub108 \ud074\ub798\uc2a4\uc785\ub2c8\ub2e4.\");\n }\n }\n}<\/code><\/pre>\n2.6. \uc815\uc801 \ud074\ub798\uc2a4 (Static Class)<\/h3>\n
\uc815\uc801 \ud074\ub798\uc2a4\ub294 \uc678\ubd80 \ud074\ub798\uc2a4\uc758 \uc815\uc801 \uba64\ubc84\ub85c \uc815\uc758\ub41c \ud074\ub798\uc2a4\uc785\ub2c8\ub2e4. \uc678\ubd80 \ud074\ub798\uc2a4\uc758 \uc778\uc2a4\ud134\uc2a4 \uc5c6\uc774\ub3c4 \uc815\uc801 \ud074\ub798\uc2a4\uc758 \uc778\uc2a4\ud134\uc2a4\ub97c \uc0dd\uc131\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
class Outer {\n static class StaticInner {\n void display() {\n System.out.println(\"\uc815\uc801 \uc774\ub108 \ud074\ub798\uc2a4\uc785\ub2c8\ub2e4.\");\n }\n }\n}<\/code><\/pre>\n3. \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uc5d0\uc11c\uc758 \ud074\ub798\uc2a4 \ud65c\uc6a9<\/h2>\n
\uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0 \uc788\uc5b4 \ud074\ub798\uc2a4\ub294 \ub9e4\uc6b0 \uc911\uc694\ud569\ub2c8\ub2e4. \ub2e4\uc591\ud55c UI \uc694\uc18c\uc640 \uae30\ub2a5\uc744 \uad6c\ud604\ud558\ub294 \ub370 \ud074\ub798\uc2a4\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, Activity\uc640 Fragment\ub294 \uc548\ub4dc\ub85c\uc774\ub4dc\uc758 \uc8fc\uc694 \uad6c\uc131 \uc694\uc18c\ub85c, \uac01\uac01\uc758 UI \uc0c1\ud0dc\ub97c \uc815\uc758\ud558\ub294 \ud074\ub798\uc2a4\ub85c \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
3.1. Activity \ud074\ub798\uc2a4<\/h3>\npublic class MainActivity extends AppCompatActivity {\n @Override\n protected void onCreate(Bundle savedInstanceState) {\n super.onCreate(savedInstanceState);\n setContentView(R.layout.activity_main);\n }\n}<\/code><\/pre>\n\uc704\uc758 \ucf54\ub4dc\ub294 \uae30\ubcf8\uc801\uc778 Activity \ud074\ub798\uc2a4\ub97c \uc815\uc758\ud55c \uc608\uc785\ub2c8\ub2e4. onCreate()<\/code> \uba54\uc18c\ub4dc\ub294 Activity\uac00 \uc0dd\uc131\ub420 \ub54c \ud638\ucd9c\ub429\ub2c8\ub2e4.<\/p>\n3.2. Fragment \ud074\ub798\uc2a4<\/h3>\npublic class SampleFragment extends Fragment {\n @Override\n public View onCreateView(LayoutInflater inflater, ViewGroup container,\n Bundle savedInstanceState) {\n return inflater.inflate(R.layout.fragment_sample, container, false);\n }\n}<\/code><\/pre>\nFragment\ub294 UI\uc758 \uc7ac\uc0ac\uc6a9\uc744 \uac00\ub2a5\ud558\uac8c \ud558\ub294 \ud074\ub798\uc2a4\uc785\ub2c8\ub2e4. onCreateView()<\/code> \uba54\uc18c\ub4dc\ub294 Fragment\uc758 UI\ub97c \uc0dd\uc131\ud569\ub2c8\ub2e4.<\/p>\n3.3. View \ud074\ub798\uc2a4<\/h3>\n
\ubaa8\ub4e0 UI \uad6c\uc131 \uc694\uc18c(\ubc84\ud2bc, \ud14d\uc2a4\ud2b8 \ubdf0 \ub4f1)\ub294 View<\/code> \ud074\ub798\uc2a4\ub97c \uc0c1\uc18d\ubc1b\uc544 \uad6c\ud604\ub429\ub2c8\ub2e4. \uac01 UI \uc694\uc18c\ub294 \uc774 \ud074\ub798\uc2a4\ub97c \ubc14\ud0d5\uc73c\ub85c \ud558\uba70, \ub2e4\uc591\ud55c \uc18d\uc131\uacfc \uba54\uc18c\ub4dc\ub97c \uc81c\uacf5\ud569\ub2c8\ub2e4.<\/p>\npublic class CustomButton extends Button {\n public CustomButton(Context context) {\n super(context);\n }\n\n public void changeColor() {\n setBackgroundColor(Color.RED);\n }\n}<\/code><\/pre>\n4. \uacb0\ub860<\/h2>\n
\uc790\ubc14\uc758 \ud074\ub798\uc2a4 \uc885\ub958\ub97c \uc774\ud574\ud568\uc73c\ub85c\uc368 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0\uc11c \uac1d\uccb4 \uc9c0\ud5a5 \ud504\ub85c\uadf8\ub798\ubc0d\uc758 \uac1c\ub150\uc744 \uc798 \ud65c\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\uc591\ud55c \ud074\ub798\uc2a4\uc640 \uac1d\uccb4\uc758 \uac1c\ub150\uc744 \uc774\uc6a9\ud558\uc5ec \ub354 \ud6a8\uc728\uc801\uc774\uace0 \uc7ac\uc0ac\uc6a9 \uac00\ub2a5\ud55c \ucf54\ub4dc\ub97c \uc791\uc131\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub610\ud55c, \uc790\ubc14\uc758 \ud074\ub798\uc2a4 \uc885\ub958\ub294 OOP\uc758 \ud2b9\uc131(\uc0c1\uc18d, \ub2e4\ud615\uc131 \ub4f1)\uc744 \ud65c\uc6a9\ud558\uc5ec \ucf54\ub4dc \uad6c\uc870\ub97c \ub354 \ub098\uc740 \ubc29\ud5a5\uc73c\ub85c \uc774\ub04c\uc5b4 \uc904 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\uc774 \uae00\uc5d0\uc11c \uc790\ubc14\uc758 \ub2e4\uc591\ud55c \ud074\ub798\uc2a4 \uc885\ub958 \ubc0f \uc774\ub97c \uc548\ub4dc\ub85c\uc774\ub4dc \uc571 \uac1c\ubc1c\uc5d0 \ud65c\uc6a9\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc0b4\ud3b4\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \uc790\ubc14\uc758 \ud074\ub798\uc2a4 \uac1c\ub150\uc744 \uc798 \uc774\ud574\ud558\uace0 \ud65c\uc6a9\ud55c\ub2e4\uba74, \ub354 \ud6a8\uacfc\uc801\uc778 \uc548\ub4dc\ub85c\uc774\ub4dc \uc571\uc744 \uac1c\ubc1c\ud558\ub294 \ub370 \ud070 \ub3c4\uc6c0\uc774 \ub420 \uac83\uc785\ub2c8\ub2e4.<\/p>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"