Introduction to Java (and object-oriented programming)
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A presentation on creating your first "Hello World" Java app and explanations on object-oriented paradigms
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Introduction to Java (and object-oriented programming)
- 1. Introduction to Java and object-oriented programming
- 2. Bina Nusantara Kemanggisan Let’s print “Hello World” Hello World!
- 3. Bina Nusantara Kemanggisan All you need to do is type System.out.println(“Hello World”); Hello World!
- 4. Bina Nusantara Kemanggisan Make an incrementing line (i.e. 0 1 2 3 4 5 6 7 8 9) Loops?
- 5. Bina Nusantara Kemanggisan To loop use, for(int i=0; i<10; i++) System.out.println(i+” “); Loops?
- 6. Bina Nusantara Kemanggisan Let’s start learning object-oriented
- 7. Bina Nusantara Kemanggisan Code using the concept of “objects”, implementing this paradigm is called object-oriented programming Object-oriented?
- 8. Bina Nusantara Kemanggisan Code using the concept of “objects”, implementing this paradigm is called object-oriented programming Object-oriented?
- 9. Bina Nusantara Kemanggisan Each object has its’ own attributes and functions. A constructor is usually made to initialize the creation of an object. Object-oriented?
- 10. Bina Nusantara Kemanggisan 1. Make classes, lots of classes! 2. Set class attributes. 3. Make a constructor! Implementation
- 11. Bina Nusantara Kemanggisan Encapsulation is used for information hiding. Psstt… you don’t want your data being public! (it’s dangerous) Encapsulation
- 12. Bina Nusantara Kemanggisan There are 3 types of encapsulation: public, protected and private Encapsulation
- 13. Bina Nusantara Kemanggisan Attributes that are public can be accessed by any class. Attributes that are protected can only be accessed by child classes. Attributes that are private can only be accessed by the class itself! Encapsulation
- 14. Bina Nusantara Kemanggisan Easy! Just add public, protected or private in front of your attribute / function i.e. private int price; Implementation
- 15. Bina Nusantara Kemanggisan Inheritance is used to make a child class inherit attributes of its’ parent class Inheritance
- 16. Bina Nusantara Kemanggisan Two important terms to remember for inheritance is parent and child Inheritance
- 17. Bina Nusantara Kemanggisan A child has all the attributes and functions of its parents (not the other way around) Inheritance
- 18. Bina Nusantara Kemanggisan In Java inheritance can be implemented by using extends i.e. public class Hatchback extends Car In the example above, it means the class Hatchback is a child of the Car parent class. Implementation
- 19. Bina Nusantara Kemanggisan Polymorphism means “multiple forms”, essentially that is a literal definition of polymorphism in object-oriented programming Polymorphism
- 20. Bina Nusantara Kemanggisan Polymorphism has variant implementations Polymorphism
- 21. Bina Nusantara Kemanggisan 1. Referencing (having multiple inheritance thus making it polymorphic) 2. Virtual Methods (overriding parent class methods) Implementation
- 22. Bina Nusantara Kemanggisan Oh… one more thing overloading functions
- 23. Bina Nusantara Kemanggisan Overloading functions are functions with the same name but have different formal parameters Overloading Functions
- 24. Bina Nusantara Kemanggisan public int a(){ //functionstuff } public int a(int x){ //functionstuff } Implementation This is an example of a overloading function. In this example, function a could receive two types of parameters none or when an integer is passed. Thus we can choose to implement a certain function by passing different parameters.
- 25. Bina Nusantara Kemanggisan 1. Tutorials Point: Java - Encapsulation https://www.tutorialspoint.com/java/java_encapsulation.htm 2. Tutorials Point: Java - Inheritance https://www.tutorialspoint.com/java/java_inheritance.htm 3. Tutorials Point: Java - Polymorphism https://www.tutorialspoint.com/java/java_polymorphism.htm Study Reference
- 26. Bina Nusantara Kemanggisan and we’re done!