01 intro to using java
- 1. Welcome To Problem SolvingProblem Solvingwith OOPand JAVAwith OOPand JAVA
- 3. Meet Your TAAlishaIDC3931 © PIC
- 4. 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?Muahahahahaha!IDC3931 © PIC
- 5. Who Drinks JAVA?IDC3931 © PIC
- 6. IDC3931 © PICWhat 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.
- 7. What Is JAVA?Java is a free, open-source, Object Oriented Programming (OOP) language – everything is contained inside classes and objects.Java is überportable – 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
- 8. How WEuse JavaSource CodeVirtual MachinesJava bytecodeCompiler
- 9. How WEuse JavaVirtual MachinesSource CodeJava bytecodeCompilerIDC3931 © PIC
- 10. Code Structure in Javasource codeclass filemethod 1statementmethod 2statementstatement
- 11. 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 ofpublic class Bicycle {}curly bracesThe source file MUST have the same name as the class. For example, the Bicycle class my be stored in the Bicycle.javafile.classA class is the blueprint from which individual objects are created. Think of a bicycle…
- 12. 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 public class Bicycle{ void pedal( ) { }}curly bracesof the class).methodA bicycle might have some methods such as: speedup(), break(), gear(), direction()…
- 13. What goes in a method?Within thecurly bracespublic class Dog {void bark ( ) {statement1;statement2; statement3; }}public class Bicycle{void pedal( ) {}}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. statement1;statement2;statement3;What are you staring at?statements
- 14. One Blueprint Can Be Used To Help Build Different ObjectsShaperotate ( )playSound ( )CircleSquareAmoebaTriangleThis is called inheritance
- 15. EVERYTHINGis made from OBJECTSObjectequals()getClass()hashCode()toString()Shaperotate()playSound()CircledoSomething()This is the Object class from which ALL other objects are created.
- 16. 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 triedJAVA!
- 17. Where To StartSetup Eclipse Classic 3.6Write your first Java programBring your laptops to class every lecture starting next week!