Object-Oriented Programming Concepts and Class Design
Learn about object-oriented programming concepts, class design, and implementation in Java through examples of creating classes like Circle and BMW_Z4. Understand constructors, methods, and properties in object-oriented programming, and see how to utilize them in practical scenarios.
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Presentation Transcript
Ps Classes Classes & Objects & Objects OBJECT OBJECT- -ORIENTED PROGRAMMING AND ORIENTED PROGRAMMING AND CLASS DESIGN CLASS DESIGN
Class Circle Pseudocode CLASS Circle BEGIN CREATE Radius = 1.0 CONSTRUCTOR Circle //called default constructor BEGIN END CONSTRUCTOR CONSTRUCTOR Circle (NewRadius) //called constructor BEGIN Radius = NewRadius END CONSTRUCTOR METHOD getArea () //compute and return circle area BEGIN RETURN (Radius * Radius * 3.14159) END METHOD END CLASS Ps
Class Circle public class Circle { double radius = 1.0; Circle() { //default constructor } Circle(double newRadius) { radius = newRadius; } public double getArea() //calculates area //another constructor { return (radius*radius*3.14159); } }
Driver in Pseudocode CLASS TestCircle BEGIN CREATE circle1, circle2 AS Circle circle1 = NEW circle() circle2 = NEW circle(25.0) PRINT ("Circle 1 area = " + circle1.getArea()) PRINT ("Circle 2 area = " + circle2.getArea()) END TestCircle // create two variables // create circle1 object // create circle2 object Outputs: Circle 1 area = 3.14159 Circle 2 area = 1963.4937499999999 Ps
Driver in Java class Test_Circle { public static void main (String args[]) { Circle c1 = new Circle(); System.out.println("The area of the c1 is " + c1.getArea()); Circle c2 = new Circle(25); System.out.println("The area of c2 is " + c2.getArea()); } }
Example CLASS BMW_Z4 BEGIN CONSTRUCTOR BMW_Z4() // constructor #1 BEGIN ModelYear = 2004 TopUp = false LicensePlate = "DEALER" END CONSTRUCTOR CONSTRUCTOR BMW_Z4(parameter: year) // constructor #2 BEGIN ModelYear = year TopUp = false LicensePlate = "DEALER" END CONSTRUCTOR END CLASS Ps
Java - Constructor Example class BMW_Z4 { int modelYear; String licensePlate; boolean topUp; BMW_Z4 () { modelYear = 2004; topUp = false; licensePlate = "DEALER"; } BMW_Z4 (int year) { modelYear = year; topUp = false; licensePlate = "DEALER"; } }
Properties Example Pseudocode CLASS BMW_Z4 BEGIN PRIVATE ModelYear PRIVATE LicensePlate PUBLIC METHOD SetModelYear (Year) BEGIN ModelYear = Year END PUBLIC METHOD GetModelYear () BEGIN RETURN ModelYear END PUBLIC METHOD SetLicensePlate (value) BEGIN LicensePlate = value END PUBLIC METHOD GetLicensePlate () BEGIN RETURN LicensePlate END END CLASS Ps
Class BMW_Z4 public class BMW_Z4 { private int ModelYear; private String LicensePlate; private boolean TopUp; public void SetModelYear(int Year) { ModelYear = Year; } public int getModelYear() { return ModelYear; } public void SetLicensePlate(String value) {LicensePlate = value;} public String getLicensePlate(){ return LicensePlate; } public void SetTopUp(boolean value) { TopUp = value; } public boolean getTopUp() { return TopUp; } }
