01 - Intro To Using Java
- 1. Welcome To Introduction to Java Programming
- 2. Meet Your Instructor That’s me
- 3. Who Should Drink JAVA? Have you done some programming? Do you want to learn Java? Do you prefer stimulating dinner conversations over coffee to dry, dull, technical lectures? Do you need this course to graduate? IDC3931 © PIC
- 4. Who Drinks JAVA? IDC3931 © PIC
- 5. What Is A Computer? A computer is something that takes in information (input), processes it according to a set of instructions (program), and produces a result (output). Computers communicate through a binary alphabet. The letters in this alphabet are ‘0’ and ‘1’. Everything else is made out of these ‘letters’ which are called bits. Bits are represented in a computer by electrical signals: low voltage would mean a ‘0’ and higher voltage a ‘1’. Eight bits gathered together form one byte. IDC3931 © PIC
- 6. What Is JAVA? Java is a free, open-source, Object Oriented Programming (OOP) language – everything is contained inside classes and objects. Java is über portable – it can run on any machine with a Java Virtual Machine (JVM) installed. No matter what computer you have, you can write the same Java programs. IDC3931 © PIC
- 7. How WE use Java Sourc e Code Compiler Java bytecod e V i r t u a l M a c h i n e s
- 8. How WE use Java Source Code Compiler Virtual Machines Java bytecode IDC3931 © PIC
- 9. Code Structure in Java source code class file method 1statement method 2statement statement
- 10. What goes in the source file? A source file (with the .java extension) holds one class definition. The class represents a piece of your program, although a very tiny application might need just a single class. The class must go within a pair of curly braces public class Bicycle { } clas s The source file MUST have the same name as the class. For example, the Bicycle class my be stored in the Bicycle.java file. A class is the blueprint from which individual objects are created. Think of a bicycle…
- 11. What goes in a class? A class has one or more methods. In the Bicycle class, the pedal method will hold instructions for how the Bicycle should pedal. Your methods must be declared inside a class (in other words, within the curly braces public class Bicycle{ void pedal( ) { } } metho d of the class). A bicycle might have some methods such as: speedup(), break(), gear(), direction()…
- 12. What goes in a method? Within the curly braces public class Dog { void bark ( ) { statement1; statement2; statement3; } } statemen ts of a method, write your instructions for how that method should be performed. Method code is basically a set of statements, and for now you can think of a function or procedure. Bicycle{ pedal( ) { statement1; statement2; statement3; What are you staring at?
- 13. One Blueprint Can Be Used To Help Build Different Objects Shape rotate ( ) playSound ( ) Squar e Triangl e Circle Amoeba This is called inheritance
- 14. EVERYTHING is made from OBJECTS Object equals() getClass() hashCode() toString() Shape rotate() playSound() Circle doSomething() This is the Object class from which ALL other objects are created.
- 15. What You Will Get Out Of Learning and Using JAVA! A thorough understanding of Object Oriented Programming. Learn a language that can be run on any platform. Build your programming skills and confidence. Learn how to work and program in groups. Develop Graphical User Interfaces. If you can make it through the day without programming, you haven’t tried JAVA!
- 16. Where To Start Setup Eclipse Classic 3.6 Write your first Java program
Editor's Notes
- #7: Add clip from Steve Jobs on OOP