บทที่ 3 พื้นฐานภาษา Java
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The document appears to be a code snippet discussing Java programming fundamentals, including data types, operators, and basic input/output operations. It includes examples of class definitions, printing to the console, and methods for handling various data types using the Scanner class. The document also briefly touches on escape sequences and arithmetic operations.
![Public class Simple{
Public static void main(String[]args){
System.out.println(“Programming is
great fun!”);
}
}](https://image.slidesharecdn.com/1-130106090919-phpapp02/85/3-Java-2-320.jpg)
![Simple
Simple.java System.out.println
(;)
public class
public static void main(String[]args)](https://image.slidesharecdn.com/1-130106090919-phpapp02/85/3-Java-3-320.jpg)
บทที่ 3 พื้นฐานภาษา Java
- 2. Public class Simple{ Public static void main(String[]args){ System.out.println(“Programming is great fun!”); } }
- 3. Simple Simple.java System.out.println (;) public class public static void main(String[]args)
- 4. main public static void main
- 5. print println out System System.out.print(data); System.out.println(data); data print println
- 6. print println escape sequence escape sequence n Newline t Horizontal tab b Backspace r Return Backslash ’ Single quote ’ ” Double quote “
- 7. 2.3
- 8. true( ) false( ) char Unicode ‘‘ Unicode u byte, short, int long
- 9. float double float double float f F boolean 1 true false char 2 Unicode byte 1 -128 +127 short 2 -32,768 +32,767 int 4 -2,147,483,648 +2,147,483,647 long 8 -2---63 2---63 - float 4 - x - - x double 8 - x 10-308 - x 10+308
- 10. A–Z,a–z,$ _ . final final = ;
- 11. // /* */ 3. /** */ total = const + tax; - Cost = total – tax; – Tax = cost * rate; Saleprice = original / 2 % Ramainder = value % 3; – ,
- 13. = X = 5; X = X + 5; -= Y -= 2; Y = Y – 2; *= Z *= 10; Z = Z * 10; /= A /= b; A = A / b; %= C %= 3; C = C % 3; – y = x++ y x
- 14. - - Cast Operator Cast Operator x = (int)number; number int
- 15. double double 2. float float 3. long long String
- 16. ( ) Method charAt(inde index x) length() toLowerCas e() toUpperCas e()
- 17. Scanner Scanner keyboard; keyboard Scanner new = new ( ); keyboard System.in keyboard = new Scanner(System.in);
- 18. Scanner nextByte() Byte nextDouble() Double nextFloat() Float nextInt() Int nextLine() nextLong() Long nextShort() Short