java for beginners programming course

Java for BeginnersMaster java basics

Learn programming the easy way, by

using the world’s most popular language

• Discover anyone can code in Java

• Write your own programs

• Be in demand world-wide

• Do Android coding

2 Marius Claassen, 2017

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.

Benefits

• Read Java code

• Develop basic Java applications

• Devise solutions when given a

problem statement

Major components

1. Introduction

2. Java basics

3. Arrays

4. Exceptions

5. Java classes

6. Conclusion

Lecture outline

• 54 Lectures

• 5 minutes

1. Video

2. PDF

3. Transcript

4. Coding exercise

Ideal student

Complete beginner who wants to learn

programming by:

• watching live coding

• doing coding exercises

• checking answers against solutions

Enrolment

30-day money back guarantee

To get details about this course:

• mariusclaassen@gmail.com

• https://www.udemy.com/course/1132484/manage/basics/

9Marius Claassen,

Java for Beginners

TOPICS:

1. Introduction

2. Java basics

3. Arrays

4. Exceptions

5. Java classes

6. Conclusion

Lecture 2: Java overview

• General-purpose programming language

• First public release in 1995

Three characteristics:

• Object-oriented

Person Dog Internet website13 Marius Claassen, 2017

• Architecture neutral

Windows Apple Linux

• Secure

Program development process

Compiler Java VM

HelloWorld.java HelloWorld.class Hello, world

object 13

Java’s popularity

object 13

Java pay

object 13

indeed.comindeed.com

Lecture 3: Development tools

• JDK (SE 8)http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

• IDE (IntelliJ IDEA)https://www.jetbrains.com/idea/download/#section=windows

• Internet browser (Google Chrome)

TOPICS:

1. Introduction

2. Java basics

3. Arrays

4. Exceptions

5. Java classes

6. Conclusion

Lecture 4: Hello world example

Hello world problem statement:

Print ‘hello world’

Lecture 4: Hello world example

public class Lecture4 {

public static void main(String[] args) {

System.out.print(“hello world”);

// hello world

Lecture 4: First coding exercise

Replace the comment with a statement to

print the name, ‘Adam’.

Lecture 5: First exercise solution

public void printAdam() {

System.out.print(“Adam”);

Lecture 6: Primitives declaration

dataType storageName; Declaration

Lecture 6: Primitives declaration

int intValue;

double doubleValue;

char charValue;

boolean booleanValue;

‘0’

Lecture 6: Primitives

• byte, short, int, long

• float, double

• boolean

• char

Lecture 6: Declaration example

Declaration problem statement:

Declare Java’s 8 primitive data types

Lecture 6: Declaration example

int intValue; // Declaration

Lecture 6: Declaration exercise

Replace the comment with a statement to

declare a ‘char’ data type, named ‘letterY’.

Lecture 7: Primitives solution

public void declareLetterY() {

char letterY; // Declaration

Lecture 8: Primitives initialization

dataType storageName; // Declaration

storageName = value; // Initialization

dataType storageName = value; // Declaration/Initialization

int intValue = 900; // Initialization

char charValue = ‘a’; // Initialization

‘a’

Lecture 8: Initialization example

Initialization problem statement:

Initialize an int data type named ‘intValue’

with the number 900.

Lecture 8: Initialization example

int intValue = 900; // Declare and Initialize

Lecture 8: Initialization exercise

Initialize a char data type, named ‘letterY’

with the value, ‘Y’.

Lecture 9: Initialization solution

public void setLetterY() {

char letterY = ‘Y’; // Declare and Initialize

Lecture 10: Operators example

Operators problem statement:

Assign ‘11 * 18’ to a ‘short’ data type named

‘answer1’.

Lecture 10: Operators example

short answer1 = 11 * 18;

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

Lecture 10: Operators exercise

Assign ‘40 – 13’ to a ‘byte’ data type named

‘answer5’

Lecture 11: Java operators solution

public void setAnswer5() {

byte answer5 = 40 - 13;

Lecture 12: Reference data types

mySignOff “Keep coding”

String mySignOff = “Keep coding”;

int myNumber = 700;

Lecture 12: References example

References problem statement:

Declare a String named, ‘mySignOff’

initialized as ‘Keep coding’

Lecture 12: References example

String mySignOff = “Keep coding”;

Lecture 12: References exercise

Declare a String named, ‘words’ initialized

as, ‘In the beginning’.

Lecture 13: References solution

public void setWords() {

String words = “In the beginning”;

Lecture 14: Scanner class example

Scanner class problem statement:

Write code to have Java ask for your name

Lecture 14: Scanner class example

System.out.print(“What is your name? ”);

Scanner scanner1 = new Scanner(System.in);

String name = scanner1.next();

System.out.print(“Your name is ” + name);

}76 Marius Claassen, 2017

Lecture 14: Scanner class exercise

Declare and initialize a String named

‘language’ as ‘scanner1.next()’

Lecture 15: Scanner class solution

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;

Lecture 16: Conditionals &&, ||

‘J’

char charJ = ‘J’;

char charK = ‘K’;

// Declare, initialize

// Declare, initialize‘K’

‘J’

char charJ = ‘J’;

char charK = ‘K’

if ( (charJ == ‘J’) && (charK == ‘K’) ) {

‘K’

System.out.print( “charJ is J and charK is K”);

Conditional operators problem statement:

Implement the ‘&&’ operator where charJ =

‘J’ and charK = ‘K’ and print ‘charJ is J AND

charK is K’.

char charJ = ‘J’; char charK = ‘K’;

if ( (charJ == ‘J’ ) && (charK == ‘K’) ) {

System.out.print(“ charJ is ‘J’ AND charK is ‘K’ ” );

Lecture 16: Conditionals exercise

Implement the ‘||’ operator with

‘evenNumber’ as 8 or ‘oddNumber’ as 12

Lecture 17: Conditionals solution

int evenNumber = 8; int oddNumber = 9;

if ( (evenNumber == 8) || (oddNumber == 12) )

System.out.print(“evenNumber is 8 OR oddNumber is 12”);

Lecture 18: If-then example

21 and 21 “Equal”

if num6 is equal to num7 then print they are equal

Lecture 18: If-then-else example

“Not equal”

56 and 65

“Equal”

“Not equal”

56 and 65

if num1 is equal to num2 then print they are equal,

else print they are not equal

If-then-else problem statement:

Implement ‘if-then-else’ where num1 = 56 and

num2 = 65, and print whether they are equal

or not

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 6589 Marius Claassen, 2017

Lecture 18: If-then-else exercise

Implement ‘if-then-else’ with testScore >= 60

Lecture 19: If-then-else solution

public void printIfThenElse() {

int testScore = 74; String result = “undefined”;

if (testScore >= 60)

{ result = “pass”; }

else { result = “fail”; }

System.out.print(result);

Lecture 20: Switch example

Switch problem statement:

Implement a ‘switch’ statement to print

weekday 6 as ‘Friday’.

“Friday”

“Saturday”

“Thursday”

“Wednesday”

“Tuesday”

“Monday”

“Sunday”

“Friday”

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

Lecture 20: Switch exercise

Implement a ‘switch’ statement to print

calendar month 3 as ‘March’

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;

Lecture 22: For loop example

Repeated action

Stop condition

For loop problem statement:

Implement a ‘for’ loop to print the five values

24 to 28.

for (int j = 24; j < 29; j++) {

System.out.print( j + “ ”);

} // 24 25 26 27 28101 Marius Claassen, 2017

Lecture 22: For loop exercise

Implement a ‘for’ loop to print the three

values 87 to 89

Lecture 23: For loop solution

public void printForLoop() {

for (int j = 87; j < 89; j++) {

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.

Lecture 24: While loop example

int j = 40;

while ( j <= 55) {

j = j + 5;

} // 40 45 50 55105 Marius Claassen, 2017

Lecture 24: While loop exercise

Implement a ‘while’ loop with the control

condition <= 18

Lecture 25: While loop solution

public void printWhileLoop() {

int j = 9;

while ( j <= 18) {

j = j + 3;

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’

Lecture 26: Do-while loop example

char letter = ‘Q’;

System.out.print(letter + “ ”);

letter++; // Increment

} while (letter <= ‘S’);

} // Q R S109 Marius Claassen, 2017

Lecture 26: Do-while exercise

Implement a ‘do-while’ loop to print the 5

letters ‘a’ to ‘e’ in reverse order

Lecture 27: Do-while loop solution

public void printDoWhileLoop() {

char letter = ‘e’;

System.out.print(letter + “ ”);

letter--; // Decrement

} while (letter >= ‘a’);

} 111 Marius Claassen, 2017

TOPICS:

1. Introduction

2. Java basics

3. Arrays

4. Exceptions

5. Java classes

6. Conclusion

Lecture 28: One-dimensional array

0 1 2 3 4

13.0 17.0 21.0 25.0 29.0

indices

array length of 5

elements

One-dimensional array problem statement:

Implement a one-dimensional double array

and print all the values using a ‘for’ loop

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, 29.0117 Marius Claassen, 2017

Lecture 28: One-D array exercise

Implement a one-dimensional integer array

named ‘values’, initialized with the elements

30, 31, 32 and 33

Lecture 29: One-D array solution

public void printOneDArray() {

int[ ] values = {30, 31, 32, 33};

for (int value : values) {

System.out.print(value + “ ”);

Lecture 30: Two-dimensional array

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

4 Rows

5 Columns

Two-dimensional array problem statement:

Implement a two-dimensional String array to

print the element at row 1 column 3

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]);

} // india123 Marius Claassen, 2017

Lecture 30: Two-D array exercise

Implement a two-dimensional String array to

print the element at row 0 column 4

Lecture 31: Two-D array solution

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]);

} 125 Marius Claassen, 2017

TOPICS:

1. Introduction

2. Java basics

3. Arrays

4. Exceptions

5. Java classes

6. Conclusion

Lecture 32: Exceptions example

Exception

throw Exception

Exceptions problem statement:

Implement an IllegalArgumentException to be

thrown when a String named 'theDate' is not

10 characters

String theDate = “2017-04-0”;

if (theDate.length() != 10) {

throw new IllegalArgumentException(

“Date must be 10 characters long”);

} // Date must be 10 characters long131 Marius Claassen, 2017

Lecture 32: Exceptions exercise

Implement an IllegalArgumentException to be

thrown when an int named ‘age’ is not a

positive number

Lecture 33: Exceptions solution

int age = -5;

if (age < 0) {

throw new IllegalArgumentException(

“Age must be a positive number”);

} // Age must be a positive number133 Marius Claassen, 2017

TOPICS:

1. Introduction

2. Java basics

3. Arrays

4. Exceptions

5. Java classes

6. Conclusion

Lecture 34: Java classes example

Java class problem statement:

Create a Java class for this lecture

Lecture 34: Java classes exercise

Create a Java class named ‘course’

Lecture 35: Java classes solution

public class Course {

Java fields problem statement:

Declare a Java ‘field’ named

‘lectureNumber’, initialize it as 36 and print it

Lecture 36: Java fields example

int lectureNumber = 36; // field

System.out.print(lectureNumber);

} // 36

Lecture 36: Java fields exercise

Declare a Java boolean ‘field’ named

‘isLectureCompleted’, initialized as ‘true’

Lecture 37: Java fields solution

boolean isLectureCompleted = true; // field

System.out.print(isLectureCompleted);

} // true

Lecture 38: Java objects example

Course course1 = new Course(); // object

Java objects problem statement:

Create an ‘object’ named ‘course1’ of

dataType ‘Course’ and print its datatype

System.out.print(course1.getClass() );

} // class Course

Lecture 38: Java objects exercise

Create an object named ‘program1’ of

dataType ‘Program’

Lecture 39: Java objects solution

Program program1 = new Program(); // object

System.out.print(program1.getClass() );

} // class Program

public class Program {

Lecture 40: Java methods example

Java methods problem statement:

Declare a method named ‘printSkillLevel’

Course course1 = new Course();

course1.printSkillLevel();

} // This course is for Java beginners

public void printSkillLevel() { // method

System.out.print(“This course is for Java beginners”);

Lecture 40: Java methods exercise

Declare a method named

‘printNumberOfCodingExercises’

Lecture 41: Java methods solution

course1.printNumberOfCodingExercises();

} // This course has 24 coding exercises

void printNumberOfCodingExercises() { // method

System.out.print(“This course has 24 coding exercises”);

Lecture 42: Parameters example

public void setJavaVersion(String version) {

Parameters problem statement:

Implement a method, ‘setJavaVersion’ that

receives one parameter, a String named

‘version’

course1.setJavaVersion(“Java 8”);

} // Java 8

public void setJavaVersion(String version) { // parameter

System.out.print(version);

Lecture 42: Parameters exercise

Implement a method, ‘setStudentLocations’

that receives one parameter, a String named

‘locations’

Lecture 43: Parameters solution

course1.setStudentLocations(“worldwide”);

} // worldwide

public void setStudentLocations(String locations) {

System.out.print(locations);

Lecture 44: Method overloading

public void printCoursePrice (String value) {

public void printCoursePrice(int number) {

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.

course1.printCoursePrice(“two hundred ”);

course1.printCoursePrice(200);

} // two hundred 200

public void printCoursePrice(String value) {

System.out.print(value); }

public void printCoursePrice( int number) {

System.out.print(number); }

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.

Lecture 45: Overloading solution

course1.printNumberOfLectures(54);

course1.printNumberOfLectures(“ fifty four”);

} // 54 fifty four

public void printNumberOfLectures(int number) {

System.out.print(number); }

public void printNumberOfLectures(String value) {

System.out.print(value); }

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’.

Lecture 46: Static modifier example

Course.languageOfInstruction = “English”; // Initialization

System.out.print(Course.languageOfInstruction );

} // English

class Course {

static String languageOfInstruction; // Declaration

Lecture 46: Static modifier exercise

Implement the ‘static’ modifier to declare an

int named ‘coursePrice’.

Lecture 47: Static modifier solution

Course.coursePrice = 200; // Initialization

System.out.print(Course.coursePrice);

} // 200

Lecture 47: Static modifier solution

class Course {

static int coursePrice; // Declaration

Lecture 48: Anonymous classes

Anonymous classes problem statement:

Implement an ‘anonymous’ class by

overriding the method named

‘getCourseName’

Course course1 = new Course() {

@Override public void getCourseName() {

System.out.print(“Java 8 for Complete Beginners”); }

course1.getCourseName();

} // Java 8 for Complete Beginners

public void getCourseName() {

System.out.print(“Java for all”);

Implement an ‘anonymous’ class by

overriding the method named ‘isLive’

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

public void isLive() {

System.out.print(“The course is live”);

Lecture 50: Inheritance example

Inheritance problem statement:

Implement ‘inheritance’ with the child class

named ‘JavaCourse’.

Lecture 50: Inheritance example

Course course1 = new Course(); // parent object

course1.learn();

JavaCourse javaCourse1 = new JavaCourse(); // child object

javaCourse1.learn();

} // Learning in general

// Studying Java184 Marius Claassen, 2017

public void learn() {

System.out.print(“Learning in general\n”);

public class JavaCourse extends Course { // Inheritance

@Override public void learn() {

System.out.print(“Studying Java”);

Lecture 50: Inheritance exercise

Implement ‘inheritance’ with the child class

named ‘Programming’

Lecture 51: Inheritance solution

Software software1 = new Software(); // parent object

software1.solveProblems();

Programming programming1 = new Programming(); // child object

programming1.solveProblems();

} // General software solutions Programming solutions

public class Software {

public void solveProblems() {

System.out.print(“Software solutions ”);

public class Programming extends Software {

@Override public void solveProblems() {

System.out.print(“Programming solutions”);

Lecture 52: Polymorphism example

Polymorphism problem statement:

Implement ‘polymorphism’ by creating a child

object with a parent class as dataType

Lecture 52: Polymorphism example

Programming programming1 = new Programming(); // parent object

programming1.printDesription();

Programming programming2 = new Java(); // child object

programming2.printDescription();

} // Programming is writing software

// Java is object-oriented192 Marius Claassen, 2017

public class Programming {

public void printDescription() {

System.out.print(“Programming is writing software\n”);

public class Java extends Programming {

@Override public void printDescription() {

System.out.print(“Java is object-oriented”);

Lecture 52: Polymorphism exercise

Implement ‘polymorphism’ by creating a child

object, ‘coding2’ with a parent class,

‘Coding’ as dataType

Lecture 53: Polymorphism solution

Coding coding2 = new Java8(); // child object

coding2.printDesription();

} // Java 8 codes functional style

public class Coding {

public void printDescription() {

public class Java8 extends Coding {

@Override public void printDescription() {

System.out.print(“Java 8 codes functional style”);

TOPICS:

1. Introduction

2. Java basics

3. Arrays

4. Exceptions

5. Java classes

6. Conclusion

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

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’.

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.202 Marius Claassen, 2017

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’.

To get details about this course:

• mariusclaassen@gmail.com

• https://www.udemy.com/course/1132484/manage/basics/

204Marius Claassen,

Java for Beginners

java for beginners programming course

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