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Java for complete beginners programming course
1. Java 8 for Complete Beginners
Master the basics of programming
2. Learn programming the easy way, by
using the world’s most popular language
to:
• Discover anyone can code in Java
• Write your own programs
• Be in demand world-wide
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3. About me
Marius Claassen, Java Developer and Teacher
I am a self-taught java developer. Having been a teacher for many
years, I am now working full-time as an independent software
instructor, making video tutorials. At the time of making these Java
tutorials, I am living in South Africa.
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4. Benefits
• Read Java code
• Develop basic Java applications
• Devise solutions when given a
problem statement
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45. Lecture 4: Hello world example
Hello world problem statement:
Print ‘hello world’
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46. Lecture 4: Hello world example
public class Lecture4 {
public static void main(String[] args) {
System.out.print(“hello world”);
}
}
// hello world
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47. Lecture 4: First coding exercise
Replace the comment with a statement to
print the name, ‘Adam’.
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48. Lecture 5: First exercise solution
public class Lecture5 {
public void printAdam() {
System.out.print(“Adam”);
}
}
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50. Lecture 6: Primitives declaration
int intValue;
double doubleValue;
char charValue;
boolean booleanValue;
00.0
F
‘0’
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00
51. Lecture 6: Primitives
• byte, short, int, long
• float, double
• boolean
• char
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52. Lecture 6: Declaration example
Declaration problem statement:
Declare Java’s 8 primitive data types
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53. Lecture 6: Declaration example
public class Lecture6 {
public static void main(String[] args) {
int intValue; // Declaration
}
}
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54. Lecture 6: Declaration exercise
Replace the comment with a statement to
declare a ‘char’ data type, named ‘letterY’.
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55. Lecture 7: Primitives solution
public class Lecture7 {
public void declareLetterY() {
char letterY; // Declaration
}
}
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57. int intValue = 900; // Initialization
char charValue = ‘a’; // Initialization
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900
‘a’
58. Lecture 8: Initialization example
Initialization problem statement:
Initialize an int data type named ‘intValue’
with the number 900.
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59. Lecture 8: Initialization example
public class Lecture8 {
public static void main(String[] args) {
int intValue = 900; // Declare and Initialize
}
}
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60. Lecture 8: Initialization exercise
Initialize a char data type, named ‘letterY’
with the value, ‘Y’.
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61. Lecture 9: Initialization solution
public class Lecture9 {
public void setLetterY() {
char letterY = ‘Y’; // Declare and Initialize
}
}
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62. Lecture 10: Operators example
Operators problem statement:
Assign ‘11 * 18’ to a ‘short’ data type named
‘answer1’.
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63. Lecture 10: Operators example
public class Lecture10 {
public static void main(String[] args) {
short answer1 = 11 * 18;
}
}
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64. Lecture 10: Java operators
• short answer1 = 11 * 18; // Multiply
• int answer2 = 15 % 4; // Remainder
• double answer3 = 12.0 + 9.0; // Add
• boolean answer4 = 36 < 35; // Less than
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65. Lecture 10: Operators exercise
Assign ‘40 – 13’ to a ‘byte’ data type named
‘answer5’
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66. Lecture 11: Java operators solution
public class Lecture11 {
public void setAnswer5() {
byte answer5 = 40 - 13;
}
}
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67. Lecture 12: Reference data types
700
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mySignOff “Keep coding”
String mySignOff = “Keep coding”;
int myNumber = 700;
68. Lecture 12: References example
References problem statement:
Declare a String named, ‘mySignOff’
initialized as ‘Keep coding’
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69. Lecture 12: References example
public class Lecture12 {
public static void main(String[] args) {
String mySignOff = “Keep coding”;
}
}
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70. Lecture 12: References exercise
Declare a String named, ‘words’ initialized
as, ‘In the beginning’.
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71. Lecture 13: References solution
public class Lecture13 {
public void setWords() {
String words = “In the beginning”;
}
}
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72. Lecture 14: Scanner class example
Scanner class problem statement:
Write code to have Java ask for your name
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73. Lecture 14: Scanner class example
public class Lecture14 {
public static void main(String[] args) {
System.out.print(“What is your name? ”);
Scanner scanner1 = new Scanner(System.in);
String name = scanner1.next();
System.out.print(“Your name is ” + name);
}
}
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74. Lecture 14: Scanner class exercise
Declare and initialize a String named
‘language’ as ‘scanner1.next()’
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75. Lecture 15: Scanner class solution
public class Lecture15 {
public String getLanguage() {
System.out.print(“Which programming language is the
most widely used? ”);
Scanner scanner1 = new Scanner(System.in);
String language = scanner1.next();
return language;
}
}
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77. Lecture 16: Conditionals &&, ||
‘J’
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char charJ = ‘J’;
char charK = ‘K’
if ( (charJ == ‘J’) && (charK == ‘K’) ) {
‘K’
System.out.print( “charJ is J and charK is K”);
}
78. Lecture 16: Conditionals &&, ||
Conditional operators problem statement:
Implement the ‘&&’ operator where charJ =
‘J’ and charK = ‘K’ and print ‘charJ is J AND
charK is K’.
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79. Lecture 16: Conditionals &&, ||
public class Lecture16 {
public static void main(String[] args) {
char charJ = ‘J’; char charK = ‘K’;
if ( (charJ == ‘J’ ) && (charK == ‘K’) ) {
System.out.print(“ charJ is ‘J’ AND charK is ‘K’ ” );
}
}
}
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80. Lecture 16: Conditionals exercise
Implement the ‘||’ operator with
‘evenNumber’ as 8 or ‘oddNumber’ as 12
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81. Lecture 17: Conditionals solution
public class Lecture17 {
public static void main(String[] args) {
int evenNumber = 8; int oddNumber = 9;
if ( (evenNumber == 8) || (oddNumber == 12) )
{
System.out.print(“evenNumber is 8 OR oddNumber is 12”);
}
}
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82. Lecture 18: If-then example
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21 and 21 “Equal”
if num6 is equal to num7 then print they are equal
84. Lecture 18: If-then-else example
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“Not equal”
56 and 65
if num1 is equal to num2 then print they are equal,
else print they are not equal
85. Lecture 18: If-then-else example
If-then-else problem statement:
Implement ‘if-then-else’ where num1 = 56 and
num2 = 65, and print whether they are equal
or not
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86. Lecture 18: If-then-else example
public class Lecture18 {
public static void main(String[] args) {
int num1 = 56; int num2 = 65;
if (num1 == num2)
{ System.out.print(“56 is equal to 65”); }
else { System.out.print(“56 is not equal to 65”); }
}
} // 56 is not equal to 65
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87. Lecture 18: If-then-else exercise
Implement ‘if-then-else’ with testScore >= 60
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88. Lecture 19: If-then-else solution
public class Lecture19 {
public void printIfThenElse() {
int testScore = 74; String result = “undefined”;
if (testScore >= 60)
{ result = “pass”; }
else { result = “fail”; }
System.out.print(result);
}
}
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89. Lecture 20: Switch example
Switch problem statement:
Implement a ‘switch’ statement to print
weekday 6 as ‘Friday’.
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91. Lecture 20: Switch example
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1
2
3
4
5
6
7
“Friday”
92. Lecture 20: Switch example
String day = “6”;
switch (day) {
case “1” : System.out.print(“Sunday”); break;
case “2” : System.out.print(“Monday”); break;
case “3” : System.out.print(“Tuesday”); break;
case “4” : System.out.print(“Wednesday”); break;
case “5” : System.out.print(“Thursday”); break;
case “6” : System.out.print(“Friday”); break;
case “7” : System.out.print(“Saturday”); break;
default: System.out.print(“Invalid weekday”); break;
} // Friday
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93. Lecture 20: Switch exercise
Implement a ‘switch’ statement to print
calendar month 3 as ‘March’
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94. Lecture 21: Switch solution
String month = “3”;
switch (month) {
case “1” : System.out.print(“January”); break;
case “2” : System.out.print(“February”); break;
case “3” : System.out.print(“March”); break;
case “4” : System.out.print(“April”); break;
.
.
default: System.out.print(“Invalid month”); break;
}
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95. Lecture 22: For loop example
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Repeated action
96. Lecture 22: For loop example
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Stop condition
97. Lecture 22: For loop example
For loop problem statement:
Implement a ‘for’ loop to print the five values
24 to 28.
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98. Lecture 22: For loop example
public class Lecture22 {
public static void main(String[] args) {
for (int j = 24; j < 29; j++) {
System.out.print( j + “ ”);
}
}
} // 24 25 26 27 28
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99. Lecture 22: For loop exercise
Implement a ‘for’ loop to print the three
values 87 to 89
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100. Lecture 23: For loop solution
public class Lecture23 {
public void printForLoop() {
for (int j = 87; j < 89; j++) {
System.out.print( j + “ ”);
}
}
}
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101. Lecture 24: While loop example
While loop problem statement:
Implement a ‘while’ loop to print the four
values, divisible by 5, from 40 to 55.
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102. Lecture 24: While loop example
public class Lecture24 {
public static void main(String[] args) {
int j = 40;
while ( j <= 55) {
System.out.print( j + “ ”);
j = j + 5;
}
}
} // 40 45 50 55
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103. Lecture 24: While loop exercise
Implement a ‘while’ loop with the control
condition <= 18
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104. Lecture 25: While loop solution
public class Lecture25 {
public void printWhileLoop() {
int j = 9;
while ( j <= 18) {
System.out.print( j + “ ”);
j = j + 3;
}
}
}
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105. Lecture 26: Do-while loop example
Do-while loop problem statement:
Implement a ‘do-while’ loop to print the 3
uppercase letters ‘Q’ to ‘S’
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106. Lecture 26: Do-while loop example
public class Lecture26 {
public static void main(String[] args) {
char letter = ‘Q’;
do {
System.out.print(letter + “ ”);
letter++; // Increment
} while (letter <= ‘S’);
}
} // Q R S
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107. Lecture 26: Do-while exercise
Implement a ‘do-while’ loop to print the 5
letters ‘a’ to ‘e’ in reverse order
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108. Lecture 27: Do-while loop solution
public class Lecture27 {
public void printDoWhileLoop() {
char letter = ‘e’;
do {
System.out.print(letter + “ ”);
letter--; // Decrement
} while (letter >= ‘a’);
}
}
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112. Lecture 28: One-dimensional array
0 1 2 3 4
13.0 17.0 21.0 25.0 29.0
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indices
array length of 5
elements
113. Lecture 28: One-dimensional array
One-dimensional array problem statement:
Implement a one-dimensional double array
and print all the values using a ‘for’ loop
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114. Lecture 28: One-dimensional array
public class Lecture28 {
public static void main(String[] args) {
double[ ] numbers = {13.0, 17.0, 21.0, 25.0, 29.0};
for (double number : numbers) {
System.out.print(number + “ ”);
}
}
} // 13.0, 17.0, 21.0, 25.0, 29.0114 Marius Claassen, 2017
115. Lecture 28: One-D array exercise
Implement a one-dimensional integer array
named ‘values’, initialized with the elements
30, 31, 32 and 33
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116. Lecture 29: One-D array solution
public class Lecture29 {
public void printOneDArray() {
int[ ] values = {30, 31, 32, 33};
for (int value : values) {
System.out.print(value + “ ”);
}
}
}116 Marius Claassen, 2017
118. Lecture 30: Two-D array example
0 1 2 3 4
alpha bravo charlie delta echo 0
foxtrot golf hotel india juliet 1
kilo lima mike november oscar 2
papa quebec romeo sierra tango 3
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4 Rows
5 Columns
119. Lecture 30: Two-D array example
Two-dimensional array problem statement:
Implement a two-dimensional String array to
print the element at row 1 column 3
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120. Lecture 30: Two-D array example
public class Lecture30 {
public static void main(String[] args) {
String[][] phoneticAlphabet = {
{“alpha”, “bravo”, “charlie”, “delta”, “echo” },
{“foxtrot”, “golf”, “hotel”, “india”, “juliet” },
{“kilo”, “lima”, “mike”, “november”, “oscar” },
{“papa”, “quebec”, “romeo”, “sierra”, “tango” } };
System.out.print(phoneticAlphabet[1][3]);
}
} // india
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121. Lecture 30: Two-D array exercise
Implement a two-dimensional String array to
print the element at row 0 column 4
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122. Lecture 31: Two-D array solution
public class Lecture31 {
public void printTwoDArray() {
String[][] countries = {
{“Argentina”, “Armenia”, “Aruba”, “Australia”, “Austria” },
{“Azerbaijan”, “Bahamas”, “Bahrain”, “Bangladesh”, “Barbados” },
{“Belarus”, “Belgium”, “Belize”, “Benin”, “Bhutan” } };
System.out.print(countries[0][4]);
}
}
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127. Lecture 32: Exceptions example
Exceptions problem statement:
Implement an IllegalArgumentException to be
thrown when a String named 'theDate' is not
10 characters
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128. Lecture 32: Exceptions example
public class Lecture32 {
public static void main(String[] args) {
String theDate = “2017-04-0”;
if (theDate.length() != 10) {
throw new IllegalArgumentException(
“Date must be 10 characters long”);
}
}
} // Date must be 10 characters long
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129. Lecture 32: Exceptions exercise
Implement an IllegalArgumentException to be
thrown when an int named ‘age’ is not a
positive number
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130. Lecture 33: Exceptions solution
public class Lecture33 {
public static void main(String[] args) {
int age = -5;
if (age < 0) {
throw new IllegalArgumentException(
“Age must be a positive number”);
}
}
} // Age must be a positive number
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132. Lecture 34: Java classes example
Java class problem statement:
Create a Java class for this lecture
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133. Lecture 34: Java classes example
public class Lecture34 {
}
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134. Lecture 34: Java classes exercise
Create a Java class named ‘course’
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135. Lecture 35: Java classes solution
public class Course {
}
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136. Lecture 36: Java classes example
Java fields problem statement:
Declare a Java ‘field’ named
‘lectureNumber’, initialize it as 36 and print it
out
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137. Lecture 36: Java fields example
public class Lecture36 {
public static void main(String[] args) {
int lectureNumber = 36; // field
System.out.print(lectureNumber);
}
} // 36
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138. Lecture 36: Java fields exercise
Declare a Java boolean ‘field’ named
‘isLectureCompleted’, initialized as ‘true’
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139. Lecture 37: Java fields solution
public class Lecture37 {
public static void main(String[] args) {
boolean isLectureCompleted = true; // field
System.out.print(isLectureCompleted);
}
} // true
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140. Lecture 38: Java objects example
public class Course {
}
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141. Course course1 = new Course(); // object
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142. Lecture 38: Java objects example
Java objects problem statement:
Create an ‘object’ named ‘course1’ of
dataType ‘Course’ and print its datatype
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143. Lecture 38: Java objects example
public class Lecture38 {
public static void main(String[] args) {
Course course1 = new Course(); // object
System.out.print(course1.getClass() );
}
} // class Course
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145. Lecture 38: Java objects exercise
Create an object named ‘program1’ of
dataType ‘Program’
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146. Lecture 39: Java objects solution
public class Lecture39 {
public static void main(String[] args) {
Program program1 = new Program(); // object
System.out.print(program1.getClass() );
}
} // class Program
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148. Lecture 40: Java methods example
Java methods problem statement:
Declare a method named ‘printSkillLevel’
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149. Lecture 40: Java methods example
public class Lecture40 {
public static void main(String[] args) {
Course course1 = new Course();
course1.printSkillLevel();
}
} // This course is for Java beginners
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150. Lecture 40: Java methods example
public class Course {
public void printSkillLevel() { // method
System.out.print(“This course is for Java beginners”);
}
}
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151. Lecture 40: Java methods exercise
Declare a method named
‘printNumberOfCodingExercises’
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152. Lecture 41: Java methods solution
public class Lecture41 {
public static void main(String[] args) {
Course course1 = new Course();
course1.printNumberOfCodingExercises();
}
} // This course has 24 coding exercises
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153. public class Course {
void printNumberOfCodingExercises() { // method
System.out.print(“This course has 24 coding exercises”);
}
}
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154. Lecture 42: Parameters example
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public void setJavaVersion(String version) {
}
155. Lecture 42: Parameters example
Parameters problem statement:
Implement a method, ‘setJavaVersion’ that
receives one parameter, a String named
‘version’
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156. Lecture 42: Parameters example
public class Lecture42 {
public static void main(String[] args) {
Course course1 = new Course(); // object
course1.setJavaVersion(“Java 8”);
}
} // Java 8
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157. public class Course {
public void setJavaVersion(String version) { // parameter
System.out.print(version);
}
}
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158. Lecture 42: Parameters exercise
Implement a method, ‘setStudentLocations’
that receives one parameter, a String named
‘locations’
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159. Lecture 43: Parameters solution
public class Lecture43 {
public static void main(String[] args) {
Course course1 = new Course(); // object
course1.setStudentLocations(“worldwide”);
}
} // worldwide
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160. public class Course {
public void setStudentLocations(String locations) {
System.out.print(locations);
}
}
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161. Lecture 44: Method overloading
public void printCoursePrice (String value) {
}
public void printCoursePrice(int number) {
}
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162. Lecture 44: Method overloading
Method overloading problem statement:
Implement method overloading, with 2
methods named ‘printCoursePrice’. The one
method receives a String parameter and the
other an int parameter.
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163. Lecture 44: Method overloading
public class Lecture44 {
public static void main(String[] args) {
Course course1 = new Course();
course1.printCoursePrice(“two hundred ”);
course1.printCoursePrice(200);
}
} // two hundred 200
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164. public class Course {
public void printCoursePrice(String value) {
System.out.print(value); }
public void printCoursePrice( int number) {
System.out.print(number); }
}
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165. Lecture 44: Overloading exercise
Implement method overloading, with 2
methods named ‘printNumberOfLectures’.
The one method receives an int parameter
and the other a String parameter.
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166. Lecture 45: Overloading solution
public class Lecture45 {
public static void main(String[] args) {
Course course1 = new Course();
course1.printNumberOfLectures(54);
course1.printNumberOfLectures(“ fifty four”);
}
} // 54 fifty four
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167. public class Course {
public void printNumberOfLectures(int number) {
System.out.print(number); }
public void printNumberOfLectures(String value) {
System.out.print(value); }
}
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168. Lecture 46: Static modifier example
Static modifier problem statement:
Implement the ‘static’ modifier to declare a
String named ‘languageOfInstruction’.
Initialize and print it as ‘English’.
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169. Lecture 46: Static modifier example
public class Lecture46 {
public static void main(String[] args) {
Course.languageOfInstruction = “English”; // Initialization
System.out.print(Course.languageOfInstruction );
}
} // English
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170. class Course {
static String languageOfInstruction; // Declaration
}
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171. Lecture 46: Static modifier exercise
Implement the ‘static’ modifier to declare an
int named ‘coursePrice’.
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172. Lecture 47: Static modifier solution
public class Lecture47 {
public static void main(String[] args) {
Course.coursePrice = 200; // Initialization
System.out.print(Course.coursePrice);
}
} // 200
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173. Lecture 47: Static modifier solution
class Course {
static int coursePrice; // Declaration
}
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174. Lecture 48: Anonymous classes
Anonymous classes problem statement:
Implement an ‘anonymous’ class by
overriding the method named
‘getCourseName’
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175. Lecture 48: Anonymous classes
public class Lecture48 {
public static void main(String[] args) {
Course course1 = new Course() {
@Override public void getCourseName() {
System.out.print(“Java 8 for Complete Beginners”); }
} ;
course1.getCourseName();
}
} // Java 8 for Complete Beginners
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176. Lecture 48: Anonymous classes
public class Course {
public void getCourseName() {
System.out.print(“Java for all”);
}
}
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177. Lecture 48: Anonymous classes
Implement an ‘anonymous’ class by
overriding the method named ‘isLive’
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178. Lecture 49: Anonymous classes
public class Lecture49 {
public static void main(String[] args) {
Course course1 = new Course() {
@Override public void isLive() {
System.out.print(“Java 8 for Complete Beginners is live”); }
} ;
course1.isLive();
}
} // Java 8 for Complete Beginners is live
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179. Lecture 49: Anonymous classes
public class Course {
public void isLive() {
System.out.print(“The course is live”);
}
}
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180. Lecture 50: Inheritance example
Inheritance problem statement:
Implement ‘inheritance’ with the child class
named ‘JavaCourse’.
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181. Lecture 50: Inheritance example
public class Lecture50 {
public static void main(String[] args) {
Course course1 = new Course(); // parent object
course1.learn();
JavaCourse javaCourse1 = new JavaCourse(); // child object
javaCourse1.learn();
}
} // Learning in general
// Studying Java
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182. public class Course {
public void learn() {
System.out.print(“Learning in generaln”);
}
}
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183. public class JavaCourse extends Course { // Inheritance
@Override public void learn() {
System.out.print(“Studying Java”);
}
}
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184. Lecture 50: Inheritance exercise
Implement ‘inheritance’ with the child class
named ‘Programming’
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185. Lecture 51: Inheritance solution
public class Lecture51 {
public static void main(String[] args) {
Software software1 = new Software(); // parent object
software1.solveProblems();
Programming programming1 = new Programming(); // child object
programming1.solveProblems();
}
} // General software solutions Programming solutions
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186. public class Software {
public void solveProblems() {
System.out.print(“Software solutions ”);
}
}
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187. public class Programming extends Software {
@Override public void solveProblems() {
System.out.print(“Programming solutions”);
}
}
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188. Lecture 52: Polymorphism example
Polymorphism problem statement:
Implement ‘polymorphism’ by creating a child
object with a parent class as dataType
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189. Lecture 52: Polymorphism example
public class Lecture52 {
public static void main(String[] args) {
Programming programming1 = new Programming(); // parent object
programming1.printDesription();
Programming programming2 = new Java(); // child object
programming2.printDescription();
}
} // Programming is writing software
// Java is object-oriented
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190. public class Programming {
public void printDescription() {
System.out.print(“Programming is writing softwaren”);
}
}
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191. public class Java extends Programming {
@Override public void printDescription() {
System.out.print(“Java is object-oriented”);
}
}
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192. Lecture 52: Polymorphism exercise
Implement ‘polymorphism’ by creating a child
object, ‘coding2’ with a parent class,
‘Coding’ as dataType
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193. Lecture 53: Polymorphism solution
public class Lecture53 {
public static void main(String[] args) {
Coding coding2 = new Java8(); // child object
coding2.printDesription();
}
} // Java 8 codes functional style
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194. public class Coding {
public void printDescription() {
}
}
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195. public class Java8 extends Coding {
@Override public void printDescription() {
System.out.print(“Java 8 codes functional style”);
}
}
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197. Lecture 54: Project 1
MathIQ.java
Write a program that asks the user to enter
the numbers, 8 and 2. The program must
then perform three calculations and print out
as answer the three values as follows:
‘16106’.
Example: 8 + 2 = 16106
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198. Lecture 54: Project 2
BMI.java
Write a program that asks the user for their
‘weight’ and ‘height’. The program must then
calculate the user’s body mass index (BMI).
Based on this BMI the program must print out
if the user is ‘underweight’, ‘normal weight’,
or ‘obese’.
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199. Lecture 54: Project 3
CompanyX.java
Write a program for CompanyX to calculate how
much to pay the company's hourly workers. The
national Department of Labour requires that
workers be paid 1.5 times for any hours more than
40 that they work in a week. Furthermore, it is a
legal requirement that hourly workers be paid a
minimum of $10.00 per hour. CompanyX requires
that workers should work for a maximum of 50
hours in a week.
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200. Lecture 54: Project 4
FizzBuzz.java
Write a method that prints all numbers between 1
and n, replacing multiples of 3 with the String
‘Fizz’, multiples of 5 with ‘Buzz’, and multiples of
15 with ‘FizzBuzz’.
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201. To buy this course:
• mariusclaassen@gmail.com
or
• https://www.udemy.com/java-8-for-complete-beginners/learn/v4/overview
201 Marius Claassen, 2017