[NHN NEXT] Java 강의 - Week1
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The document discusses Java programming concepts like the Java Virtual Machine (JVM), classes, and the "Hello World" program. It shows how to create a simple Hello World program in Java using an editor, compiling the code with javac, and running the executable with java. It also demonstrates how to call methods between separate classes and load them dynamically at runtime on the JVM.
![public
class
Hello
{
public
static
void
main(String
[]
args)
{
System.out.println(Hello,
World!);
}
}
Hello.java](https://image.slidesharecdn.com/plinjava-week01-140723044157-phpapp02/85/NHN-NEXT-Java-Week1-36-320.jpg)
![public
class
Hello
{
public
static
void
main(String
[]
args)
{
System.out.print(Hello,
);
World.print();
}
}
Hello.java
World.java
public
class
World
{
public
static
void
print()
{
System.out.println(World);
}
}](https://image.slidesharecdn.com/plinjava-week01-140723044157-phpapp02/85/NHN-NEXT-Java-Week1-48-320.jpg)
[NHN NEXT] Java 강의 - Week1
- 1. PL
- 2. in
- 4. Week01
- 5. Java? 조영호
- 7. Java!
- 9. 프로그래밍
- 10. 연습
- 11. C/C#
- 12. 과정을
- 14. 이수하셨다면
- 15. 오늘
- 16. 배우는
- 17. 내용은
- 18. 아주
- 19. 쉽습니다
- 20. C
- 21. C#
- 22. Java
- 23. 단순
- 24. 변환
- 26. C C# Java Week1
- 28. To p i c s
- 29. JVM Class Convention Data Type String Operation Condition Loop Array
- 30. Hello World!
- 32. 에디터를
- 33. 이용해
- 34. 코드
- 35. 작성
- 36. public class Hello { public static void main(String [] args) { System.out.println(Hello, World!); } } Hello.java
- 37. Compile
- 39. Execute
- 41. main() 메서드를
- 42. 실행하라
- 43. World.class Call
- 44. 에디터를
- 45. 이용해
- 46. 코드
- 47. 작성
- 48. public class Hello { public static void main(String [] args) { System.out.print(Hello, ); World.print(); } } Hello.java World.java public class World { public static void print() { System.out.println(World); } }
- 49. Compile
- 50. Compile javac Hello.java Hello.java Hello.class Compile World.java World.class CallWorld.print();
- 51. Execute
- 53. Linking??
- 56. Execute java Hello Hello.class World.class Load Hello class
- 58. Execute java Hello Hello.class World.class Call Load Hello class World.print(); Load World class
- 60. Hello.class World.class Load Hello class Load World class JVM
- 61. OS
- 62. Hello.class World.class Load Hello class Load World class JVM OS
- 63. Byte Code (OS에
- 64. 독립)
- 65. (OS에
- 66. 종속)
- 68. Write Once Run Anywhere
- 69. WORA
- 71. Eclipse
- 73. To p i c s
- 74. JVM Class Convention Data Type String Operation Condition Loop Array
- 75. 규칙
- 76. 훑어
- 77. 보기
- 78. public class Hello { public static void main(String [] args) { System.out.println(Hello, World!); } } 모든
- 79. 코도는
- 80. 반드시
- 82. 클래스
- 83. 안에
- 84. 위치
- 85. public
- 86. 클래스
- 87. 이름은
- 89. 파일명과
- 90. 동일하게
- 91. 명령행
- 92. 인자를
- 93. 전달
- 94. 받는
- 96. 문자열
- 97. 배열
- 98. main()
- 99. 메서드는
- 101. 반드시
- 102. 하나만
- 104. 존재해야
- 105. 함
- 106. 화면에
- 107. 출력하기
- 108. 위해서는
- 111. 또는
- 113. System.out.print()
- 114. 사용
- 115. 모든
- 116. 문장은
- 117. ‘;’으로
- 118. 종료
- 119. 클래스
- 120. 선언
- 121. public
- 122. class
- 123. 클래스명
- 124. {
- 126. }
- 127. “{”은
- 129. 같은
- 130. 행에
- 133. 명명
- 134. 규칙
- 135. public class Hello { public static void main(String [] args) { System.out.println(Hello, World!); } } 클래스
- 136. 이름은
- 137. 첫글자만
- 138. 대문자로
- 139. 시작
- 140. 매개변수,
- 141. 지역변수는
- 142. 소문자로
- 143. 시작
- 144. 메소드
- 145. 이름은
- 146. 소문자로
- 147. 시작
- 149. Camel Case
- 150. ClassName
- 151. methodName
- 152. variableName
- 154. To p i c s
- 155. JVM Class Convention Data Type String Operation Condition Loop Array
- 156. Type Size Min Max boolean 8bit false true char 16bit u0000 uffff byte 8bit -128 127 short 16bit -32,768 32767 int 32bit -2,147,483,648 2,147,483,647 long 64bit -9,223,372,036,854,775,808 9,223,372,036,854,775,807 float 32bit 7개의
- 157. 유효
- 158. 숫자를
- 159. 가지며,
- 160. -3.4E+38의
- 161. 근사값
- 162. 7개의
- 163. 유효
- 164. 숫자를
- 165. 가지며,
- 166. 3.4E+38의
- 167. 근사값
- 168. double 64bit 15개의
- 169. 유효
- 170. 숫자를
- 171. 가지며,
- 172. -1.7E+308의
- 173. 근사값
- 174. 15개의
- 175. 유효
- 176. 숫자를
- 177. 가지며,
- 178. 1.7E+308의
- 179. 근사값
- 180. Primitive Type
- 182. public class Primitve { public static void main(String [] args) { boolean booleanValue = true; byte byteValue = 10; char charValue = 'A'; short shortValue = 10; int integerValue = 10; long longValue = 10; float floatValue = 0.1f; double doubleValue = 0.1; System.out.printf(%b %d %c %d %d %d %f %f, booleanValue, byteValue, charValue, shortValue, integerValue, longValue, floatValue, doubleValue) ; } } Primitive.java Primitive Type
- 184. diff C/C# Java
- 185. unsigned int
- 186. uint
- 187. or
- 188. No
- 189. diff C C#/Java
- 190. No Pointer Type
- 192. diff C C#/Java
- 194. Reference Type
- 195. boolean, char, byte, short , int , long, float , double String, Object, Array … Pointer Type ?
- 198. ReferenceType
- 199. Stack Heap
- 200. boolean, char, byte, short , int , long, float , double String, Object, Array
- 201. Heap diff C C#/Java
- 202. No
- 203. malloc
- 204. calloc
- 205. realloc
- 207. diff C C#/Java
- 208. new
- 209. Heap
- 210. public class NewIsMalloc { public static void main(String [] args) { int sum = 0; int [] intArray = new int [] {1, 2, 3, 4, 5}; for(int loop=0; loopintArray.length; loop++) { sum += intArray[loop]; } System.out.println(sum); } } NewIsMalloc.java new
- 213. ReferenceType
- 214. Stack Heap
- 215. sum 0 1 2 3 4 5intArray
- 216. new를
- 217. 이용한
- 218. 메모리
- 219. 할당
- 220. 불가능
- 221. 주소
- 222. 참조
- 223. 불가능
- 224. Primitive Type diff C C#/Java
- 226. diff C/C# Java
- 227. No struct
- 228. Use Class
- 230. Heap diff C C#/Java
- 231. No
- 232. free
- 234. Heap diff C C#/Java
- 235. Garbage Collection
- 237. To p i c s
- 238. JVM Class Convention Data Type String Operation Condition Loop Array
- 239. C String
- 240. char *school = Next; char school[5] = Next; int length = strlen(school); char first = school[0];
- 241. C# String
- 242. char first = school[0]; int length = school.Length; string school = Next;
- 243. Java String
- 244. String school = Next; int length = school.length();
- 246. char *school = Next; int length = strlen(school); String school = Next; int length = school.length(); Data Function Data + Function
- 247. To p i c s
- 248. JVM Class Convention Data Type String Operation Condition Loop Array
- 249. C = C# = Java
- 251. To p i c s
- 252. JVM Class Convention Data Type String Operation Condition Loop Array
- 253. C = C# = Java
- 254. if, switch, for, while
- 256. diff C C#/Java
- 257. C 0 == false !0 == true No boolean
- 259. diff C C#/Java
- 260. C int number = 0; if (number = 1) { printf(truen); } else { printf(falsen); }
- 261. diff C C#/Java
- 262. C# Java bool
- 263. boolean
- 265. C# Java int positive = 10; if (positive) { ... } boolean positive = true; if (positive) { ... } diff C C#/Java
- 266. // error
- 267. diff C C#/Java
- 268. switch(???)
- 270. C -C# - Java
- 272. #include stdio.h #include time.h #include stdlib.h int main(int argc, char *argv[]) { int number; int count = 1; srand((int)time(NULL)); number = (rand() % 100) + 1; printf(1~100사이의 컴퓨터가 생각한 숫자를 맞춰 보세요. 6번까지 시도할 수 있습니다.n); do { int guess; printf(생각하신 숫자는? ); scanf(%d, guess); if (guess != number count == 6) { printf(6번의 시도가 모두 종료되었습니다. 다음에 다시 시도해 주세요.n); break; } if (guess == number) { printf(성공하셨습니다!!!n); break; } if (guess number) { printf(너무 높네요!n); } else { printf(너무 낮네요!n); } count++; } while (1); } C
- 273. using System; namespace Guess { class Guess { public static void Main(string[] args) { Random random = new Random(); int number = random.Next(1, 101); Console.WriteLine(1~100사이의 컴퓨터가 생각한 숫자를 맞춰 보세요. 6번까지 시도할 수 있습니다.); int count = 1; do { Console.Write(생각하신 숫자는? ); int guess = int.Parse(Console.ReadLine()); if (guess != number count == 6) { Console.WriteLine(6번의 시도가 모두 종료되었습니다. 다음에 다시 시도해 주세요.); break; } if (guess == number) { Console.WriteLine(성공하셨습니다!!!); break; } if (guess number) { Console.WriteLine(너무 높네요!); } else { Console.WriteLine(너무 낮네요!); } count++; } while (true); } } } C#
- 274. package Guess; import java.util.Scanner; public class Guess { public static void main(String [] args) { int number = (int)(Math.random() * 100) + 1; System.out.println(1~100사이의 컴퓨터가 생각한 숫자를 맞춰 보세요. 6번까지 시도할 수 있습니다.); int count = 0; do { System.out.print(생각하신 숫자는? ); Scanner scanner = new Scanner(System.in); int guess = scanner.nextInt(); scanner.close(); if (guess != number count == 6) { System.out.println(6번의 시도가 모두 종료되었습니다. 다음에 다시 시도해 주세요.); break; } if (guess == number) { System.out.println(성공하셨습니다!!!); break; } if (guess number) { System.out.println(너무 높네요!); } else { System.out.println(너무 낮네요!); } count++; } while (true); } } Java
- 275. To p i c s
- 276. JVM Class Convention Data Type String Operation Condition Loop Array
- 277. 1차원
- 278. 배열
- 280. C
- 281. #include stdio.h void show_arrays(int [], int); int main(int argc, char *argv[]) { int arrays[] = {1, 2, 3, 4, 5}; int len = sizeof(arrays) / sizeof(int); int *ptr_arrays = arrays; show_arrays(ptr_arrays, len); } // void show_arrays(int *arrays, int len) void show_arrays(int arrays[], int len) { int loop; for(loop=0; loop len; loop++) { printf(%dt, arrays[loop]); } printf(n); }
- 282. using System; namespace Arrays { class Arrays { public static void Main(string[] args) { int[] arrays = new int[] { 1, 2, 3, 4, 5 }; ShowArrays1(arrays); ShowArrays2(arrays); } public static void ShowArrays1(int[] arrays) { for (int loop = 0; loop arrays.Length; loop++) { Console.Write({0}t, arrays[loop]); } Console.WriteLine(); } public static void ShowArrays2(int[] arrays) { foreach (int each in arrays) { Console.Write({0}t, each); } Console.WriteLine(); } } } C#
- 284. public class Arrays { public static void main(String [] args) { int [] arrays = new int [] { 1, 2, 3, 4, 5 }; showArrays1(arrays); showArrays2(arrays); } public static void showArrays1(int [] arrays) { for (int loop = 0; loop arrays.length; loop++) { System.out.printf(%dt, arrays[loop]); } System.out.println(); } public static void showArrays2(int[] arrays) { for(int each : arrays) { System.out.printf(%dt, each); } System.out.println(); } } Java
- 286. 2차원
- 287. 배열
- 289. C
- 290. #include stdio.h void show_arrays(int (*)[5], int len); int main(int argc, char *argv[]) { int arrays[3][5] = { { 1, 2, 3, 4, 5}, { 6, 7, 8, 9, 10}, {11, 12, 13, 14, 15} }; int rows = sizeof(arrays) / sizeof(arrays[0]); show_arrays(arrays, rows); } void show_arrays(int (*arrays)[5], int rows) { int row; for(row=0; row rows; row++) { int col; for(col=0; col5; col++) { printf(%dt, arrays[row][col]); } printf(n); } printf(n); }
- 291. using System; namespace Arrays { class Arrays { public static void Main(string[] args) { int[, ] arrays = new int[,] { { 1, 2, 3, 4, 5}, { 6, 7, 8, 9, 10}, {11, 12, 13, 14, 15} }; ShowArrays1(arrays); } public static void ShowArrays1(int[,] arrays) { for (int row = 0; row arrays.GetLength(0); row++) { for (int col = 0; col arrays.GetLength(1); col++) { Console.Write({0}t, arrays[row, col]); } Console.WriteLine(); } Console.WriteLine(); } } } C#
- 293. public class Arrays { public static void main(String [] args) { int [][] arrays = new int [][] { { 1, 2, 3, 4, 5}, { 6, 7, 8, 9, 10}, {11, 12, 13, 14, 15} }; showArrays1(arrays); } public static void showArrays1(int [][] arrays) { for (int row = 0; row arrays.length; row++) { for(int col=0; colarrays[row].length; col++) { System.out.printf(%dt, arrays[row][col]); } System.out.println(); } System.out.println(); } } Java