Object-Oriented Programming 2
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This document discusses basic programming concepts in Java, including variables, data types, operators, and type conversion. It defines primitive data types like int, float, boolean and reference types like String. Arithmetic, relational, logical and bitwise operators are described along with examples. Implicit and explicit type conversion between data types is also covered. The document provides examples of declaring and initializing variables, using operators, and performing explicit type conversions in Java code.
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Chapter 2 Basic Programming Concepts
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Object-Oriented Programming 2
- 1. CHAPTER 2 BASIC PROGRAMMING CONCEPTS Mr.Warawut Khangkhan e-Mail: [email protected] Social Media: www.facebook.com/AjWarawut
- 2. Mr.Warawut Khangkhan Chapter 2 Basic Programming Concepts Basic Programming Concepts PROGRAMMING IN STRUCTURED JAVA 2
- 3. Mr.Warawut Chapter 1 Java & OOP Khangkhan 3
- 4. Mr.Warawut Khangkhan Chapter 2 Basic Programming Concepts Chapter 2 Basic Programming Concepts VARIABLE DATA & 4
- 5. JAVA Mr.Warawut Khangkhan F F a-z, A-Z, _, $ F F Chapter 2 Basic Programming Concepts a-z, A-Z, _, $ F F F F ˈ (Case Sensitive) F (Reserved Word) Literal Words (True, False, Null) 5
- 6. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 6 F RESERVED WORD
- 7. (DECLARATION) Mr.Warawut Khangkhan ˈ F F (Data Type) F Chapter 2 Basic Programming Concepts dataType varName [= value]; dataType = F varName = value = F 7
- 8. F Mr.Warawut Khangkhan String name; float score; Chapter 2 Basic Programming Concepts char grade; String name = “Warawut”; float score = 85.5f; char grade = ‘A’; 8
- 9. Mr.Warawut Khangkhan Chapter 2 Basic Programming Concepts Basic Programming Concepts DATA TYPE 9
- 10. F (DATA TYPE) Mr.Warawut Khangkhan Primitive Data Type - F F F Chapter 2 Basic Programming Concepts Class Type – Interface Array Type – F ˈ F F F ˈ 10
- 11. F (PRIMITIVE DATA TYPE) Mr.Warawut Khangkhan F (Integer) F Chapter 2 Basic Programming Concepts (Floating Point) F (Character) F F (Boolean) 11
- 12. INTEGER TYPE Mr.Warawut Khangkhan Data Type Size Range (Byte) Chapter 2 Basic Programming Concepts byte 1 -128 to +127 short 2 -32,768 to +32,767 int 4 -2,147,483,648 to +2,147,483,647 long 8 -9,223,372,036,854,775,808 to +9,223,372,036,854,775,807 12
- 13. EX. INTEGER TYPE Mr.Warawut Khangkhan byte A = 65; short B = 32767; Chapter 2 Basic Programming Concepts int C = 2147286444; long D = 21472864448L; long E = 21472864438l; 13
- 14. FLOATING POINT TYPE Mr.Warawut Khangkhan Data Type Size Range (Byte) Chapter 2 Basic Programming Concepts float 4 -3.40292347E+38 to +3.40292347E+38 double 8 -1.79769313486231570E+308 to +1.79769313486231570E+308 float a = 200; float b = 200.5f; // 200.5F; double c = 300; 14 double d = 300.7d; // 300.7D;
- 15. CHARACTER TYPE Mr.Warawut Khangkhan Data Type Size Range (Byte) Chapter 2 Basic Programming Concepts char 2 0 to 65,535 char c = ‘A’; char cInt = 65; 15
- 16. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 16 EX. PROGRAMMING CHARACTER TYPE
- 17. BOOLEAN TYPE Mr.Warawut Khangkhan F F F2 F F ˈ F Chapter 2 Basic Programming Concepts true false boolean b1 = false; boolean b2 = true; 17
- 18. STRING TYPE Mr.Warawut Khangkhan Java F F F F Chapter 2 Basic Programming Concepts (class) String name = “Warawut”; String langProg = “Java”; 18
- 19. Mr.Warawut Khangkhan Chapter 2 Basic Programming Concepts Basic Programming Concepts CONSTANT 19
- 20. F (CONSTANT) Mr.Warawut Khangkhan F F F Chapter 2 Basic Programming Concepts final dataType varName [= value]; dataType = F varName = value = F 20
- 21. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 21 EX. PROGRAMMING CONSTANT
- 22. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 22 EX. PROGRAMMING CONSTANT
- 23. Mr.Warawut Khangkhan Chapter 2 Basic Programming Concepts Basic Programming Concepts OPERATOR 23
- 24. (OPERATOR) Mr.Warawut Khangkhan F (Expression) F F F F , , ˆ F Chapter 2 Basic Programming Concepts F F (Operator) F F num1 + num2 a = (b - c) * d 24
- 25. (OPERATOR) Mr.Warawut Khangkhan F (Assignment Operators) Chapter 2 Basic Programming Concepts F (Arithmetic Operators) (Comparison Operators) F (Logical Operators) (Unary Operators) (Bitwise Operators) 25
- 26. ASSIGNMENT OPERATORS Mr.Warawut Khangkhan Operator Description = F Chapter 2 Basic Programming Concepts += F -= F *= F /= F %= F 26
- 27. ASSIGNMENT OPERATORS Mr.Warawut Khangkhan F F F F F a = 30 a = 30 30 Chapter 2 Basic Programming Concepts a += 5 a = a + 5 35 a -= 10 a = a - 10 25 a *= 2 a = a * 2 50 a /= 5 a = a / 5 10 a %= 5 a = a % 5 0 27
- 28. ARITHMETIC OPERATORS Mr.Warawut Khangkhan Operator Description Example + a + b Chapter 2 Basic Programming Concepts - a - b * a * b / a / b % a % b 28
- 29. COMPARISON OPERATORS Mr.Warawut Khangkhan Operator Description Example == F a == b Chapter 2 Basic Programming Concepts != F F a != b > F a > b >= F F a >= b < F F a < b <= F F F a <= b 29
- 30. LOGICAL OPERATORS Mr.Warawut Khangkhan Operator Description Example && and a && b Chapter 2 Basic Programming Concepts || or a || b ! not !a 30
- 31. LOGICAL OPERATORS Mr.Warawut Khangkhan a b a && b a || b !a !b T T T T F F Chapter 2 Basic Programming Concepts T F F T F T F T F T T F F F F F T T T – True F – False 31
- 32. UNARY OPERATORS Mr.Warawut Khangkhan Operator Description Format Example Execute ++ F Postfix a = b++ a=b b=b+1 Chapter 2 Basic Programming Concepts Prefix a = ++ b b=b+1 a=b F Postfix a = b-- a=b -- b=b-1 Prefix a = --b b=b–1 a=b 32
- 33. UNARY OPERATORS Mr.Warawut Khangkhan a = 5; System.out.println(a); System.out.println(a); Chapter 2 Basic Programming Concepts 5 System.out.println(a++); System.out.println(a++); 5 System.out.println(++a); System.out.println(++a); 7 System.out.println(a); System.out.println(a); 7 System.out.println(--a); System.out.println(--a); 6 System.out.println(a--); (a-- System.out.println(a--); 6 System.out.println(a); System.out.println(a); 5 33
- 34. BITWISE OPERATORS Mr.Warawut Khangkhan Operator Description << left shift F Chapter 2 Basic Programming Concepts >> right shift & bitwise AND | bitwise OR ^ bitwise XOR ˈ F 34 (Operand) F Integer Character
- 35. BITWISE OPERATORS Mr.Warawut Khangkhan a b a & b a | b a ^ b 1 1 1 1 0 Chapter 2 Basic Programming Concepts 1 0 0 1 1 0 1 0 1 1 0 0 0 0 0 1 – Open (True) 0 – Close (False) 35
- 36. BITWISE OPERATORS Mr.Warawut Khangkhan F a = 01000001, b = 00100001 a&b Chapter 2 Basic Programming Concepts a 0 1 0 0 0 0 0 1 & b 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 36
- 37. BITWISE OPERATORS Mr.Warawut Khangkhan F a = 01000001, b = 00100001 a|b Chapter 2 Basic Programming Concepts a 0 1 0 0 0 0 0 1 | b 0 0 1 0 0 0 0 1 0 1 1 0 0 0 0 1 37
- 38. BITWISE OPERATORS Mr.Warawut Khangkhan F a = 01000001, b = 00100001 a^b Chapter 2 Basic Programming Concepts a 0 1 0 0 0 0 0 1 ^ b 0 0 1 0 0 0 0 1 0 1 1 0 0 0 0 0 38
- 39. BITWISE OPERATORS Mr.Warawut Khangkhan a << 2 Chapter 2 Basic Programming Concepts a 0 0 1 0 0 0 0 1 1 0 0 0 0 1 0 0 If x = 8 then y = x << 2 is that y = 8 * 22 = 32 39
- 40. BITWISE OPERATORS Mr.Warawut Khangkhan b >> 3 Chapter 2 Basic Programming Concepts b 0 1 0 0 0 0 0 1 0 0 0 0 1 0 0 0 If x = 32 then y = x >> 2 is that y = 32 / 22 = 8 40
- 41. Mr.Warawut Khangkhan Chapter 2 Basic Programming Concepts Chapter 2 Basic Programming Concepts OPERATOR OF PRCEDENCE 41
- 42. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 42 F F F F F F (Operand) F F ˈ F
- 43. 1 ( ), [ ] L R 2 ++, --, !, ~ R L Mr.Warawut Khangkhan 3 *, /, % L R 4 +, - L R 5 <<, >>, >>> L R Chapter 2 Basic Programming Concepts 6 <, <=, >, >= L R 7 ==, != L R 8 & L R 9 ^ L R 10 | L R 11 && L R 12 || L R 13 ?: L R 14 =, +=, -=, *=, /=, %=, <<=, >>=, >>>=, &=, ^=, R L != 43
- 44. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 44 25 25 a = 5, b = 2, c = 10 70 70 (a + b) * c = ? a+b*c=?
- 45. a = 5, b = 2, c = 10, d = 3 Mr.Warawut Khangkhan a+b*c+d=? 73 28 Chapter 2 Basic Programming Concepts (a + b) * c + d = ? 73 28 (a + b) * (c + d) = ? 73 a + (b * c) + d = ? 28 45
- 46. Mr.Warawut Khangkhan Chapter 2 Basic Programming Concepts Chapter 2 Basic Programming Concepts CONVERSION DATA TYPE 46
- 47. F Mr.Warawut Khangkhan Implicit Type Conversion - F F Chapter 2 Basic Programming Concepts Explicit Type Conversion - F F 47
- 48. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 48 F F ˈ IMPLICIT TYPE F CONVERSION ˈ F F F
- 49. EXPLICIT TYPE CONVERSION Mr.Warawut Khangkhan F F ˈ F F ˈ F F Chapter 2 Basic Programming Concepts valNameResult = (dataType) valName valNameResult = F F dataType = F valName = F F 49
- 50. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 50 EX. CODE EXPLICIT TYPE CONVERSION
- 51. EXPLICIT TYPE CONVERSION Mr.Warawut Khangkhan F F F F ˈ F Java Chapter 2 Basic Programming Concepts F F F (Character) F ˈ F F F ˈ F (Method) (Class) Wrapper ˈ class F F (Primitive Data Type) 51
- 52. F METHOD F CLASS WRAPPER Mr.Warawut Khangkhan Class Primitive Method F F ˈ Method F F ˈ Wrapper Data Type Chapter 2 Basic Programming Concepts Integer int Integer.parseInt( ) Integer.toString( ) Float float Float.parseFloat( ) Float.toString( ) Double double Double.parseDouble( ) Double.toString( ) 52
- 53. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 53 EX. CODE CLASS WRAPPER
- 54. Mr.Warawut Khangkhan Chapter 2 Basic Programming Concepts Basic Programming Concepts DATA OUTPUT & INPUT 54
- 55. F F PRINTLN Mr.Warawut Khangkhan Method println( ) print( ) F F Object out Class System Chapter 2 Basic Programming Concepts System.out.println(arg1 + arg2 + … + arg_n); or System.out.print(arg1 + arg2 + .. + arg_n); arg1, arg2, arg_n = ˈ F F 55
- 56. F ARGUMENT Mr.Warawut Khangkhan b cursor 1 Chapter 2 Basic Programming Concepts f F F n F r cursor F t ’ ‘ ” ” xxx Ascii F 065 A 56 uxxx Unicode F u0008 F
- 57. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 57
- 58. F F PRINTF Mr.Warawut Khangkhan Method printf( ) F F Object out Class System Chapter 2 Basic Programming Concepts System.out.printf(Control_String, arg1 + arg2 + … + arg_n); Control_String = F , F arg1, arg2, arg_n = ˈ F F 58
- 59. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 59 METHOD exponential F F F F PRINTF %d %u %c %e %s %f
- 60. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 60 F F F F F F F F METHOD PRINTF F F F F F F F F F ˈ F F ) + - .( F F
- 61. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 61
- 62. F F JOPTIONPANE Mr.Warawut Khangkhan Class JOptionPane F Graphic Mode Popup Chapter 2 Basic Programming Concepts Window F Dialogbox MessageDialog F method showMessageDialog( ) F F F Class JOptionPane F F Object Class JOptionPane F F import class package javax.swing F project 62
- 63. F F JOPTIONPANE Mr.Warawut Khangkhan JOptionPane.showMessageDialog( Parent_Window, Message, Title, Type); Chapter 2 Basic Programming Concepts Parent_Window = ˈ F F F F ˈ null Dialog box F Message = ˈ F Dialog box Title = ˈ F F Title bar 63
- 64. F F JOPTIONPANE Mr.Warawut Khangkhan Type = ˈ Dialog box F F Chapter 2 Basic Programming Concepts • ERROR_MESSAGE - F • INFORMATION_MESSAGE - F • PLAIN_MESSAGE - F F F • QUESTION_MESSAGE - • WARNING_MESSAGE - F 64
- 65. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 65
- 66. F DECIMALFORMAT Mr.Warawut Khangkhan ˈ F F F F Chapter 2 Basic Programming Concepts Class DecimalFormat F import package java.text F Project 66
- 67. F DECIMALFORMAT Mr.Warawut Khangkhan DecmialFormat df = new DecimalFormat(arg); String str = df.format(payment); Chapter 2 Basic Programming Concepts arg = ˈ F F • 0 0 F • “#” F F0 ˈ 0 F • “,” ˈ df = ˈ object class F 67 str = ˈ F F F
- 68. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 68
- 69. F F INPUTSTREAMREADER Mr.Warawut Khangkhan Class InputStreamReader ˈ F Class BufferedReader Chapter 2 Basic Programming Concepts F 1 F Method readLine( ) ˈ F F (String) F import package java.io F 69
- 70. F INPUTSTREAMREADER Mr.Warawut Khangkhan InputStreamReader rd = new InputStreamReader(System.in); BufferedReader stdin = new BufferedReader(rd); Chapter 2 Basic Programming Concepts or BufferedReader stdin = new InputStreamReader( new InputStreamReader(System.in)); reader = ˈ object class InputStreamReader stdin = ˈ object class BufferedReader 70
- 71. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 71
- 72. F F SCANNER Mr.Warawut Khangkhan F F ˈ F F Chapter 2 Basic Programming Concepts F Scanner F F object class Scanner F import package java.util 72
- 73. SCANNER Mr.Warawut Khangkhan Scanner sn = new Scanner(System.in); Chapter 2 Basic Programming Concepts sn = ˈ object F class Scanner System.in = ˈ F F F F F ˂ F Method •nextInt( ) F Integer •nextFloat( ) F Float •nextDouble( ) F Double 73 •nextLine( ) F String
- 74. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 74
- 75. F F JOPTIONPANE Mr.Warawut Khangkhan F Method showInputDialog( ) F ˈ F F (String) Chapter 2 Basic Programming Concepts F JOptionPane F F object class JOptionPane F import package javax.swing 75
- 76. JOPTIONPANE Mr.Warawut Khangkhan JOptionPane.showInputDialog( Parent_Window, Message, Title, Type); Chapter 2 Basic Programming Concepts Parent_Window = ˈ F F F F ˈ null Dialog box F Message = ˈ F Dialog box Title = ˈ F F Title bar 76
- 77. JOPTIONPANE Mr.Warawut Khangkhan Type = ˈ Dialog box F F Chapter 2 Basic Programming Concepts • ERROR_MESSAGE - F • INFORMATION_MESSAGE - F • PLAIN_MESSAGE - F F F • QUESTION_MESSAGE - • WARNING_MESSAGE - F 77
- 78. Mr.Warawut Chapter 2 Basic Programming Concepts Khangkhan 78