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Java Tutorial : Inheritance Has A Relationship (Car) |
Java Tutorial : Inheritance Has A Relationship (Car) |
public class Car { private String color; private int maxSpeed; public Car(String color, int maxSpeed) { super(); this.color = color; this.maxSpeed = maxSpeed; } public String getColor() { return color; } public void setColor(String color) { this.color = color; } public int getMaxSpeed() { return maxSpeed; } public void setMaxSpeed(int maxSpeed) { this.maxSpeed = maxSpeed; } public void carInfo() { System.out.println("Car Color= " + color + ", Max Speed= " + maxSpeed); } }
public class Engine { public void start() { System.out.println("Engine Started:"); } public void stop() { System.out.println("Engine Stopped:"); } }
/** * * MarutiSwift is specific type of Car which extends Car class means MarutiSwift * IS-A Car. * * MarutiSwift extends Car and thus inherits all properties and methods from Car * (except final and static). * * MarutiSwift can also define all its specific functionality. */ public class MarutiSwift extends Car { /* * MarutiSwift HAS-A Engine */ private Engine engine; public MarutiSwift(String color, int maxSpeed, Engine engine) { super(color, maxSpeed); this.engine = engine; } public void startMarutiSwift() { engine.start(); } }RelationshipDemo.java
/** * RelationsDemo class is making object of MarutiSwift class and initialized it. * Though MarutiSwift class does not have setColor(), setMaxSpeed() and carInfo() * methods still we can use it due to IS-A relationship of MarutiSwift class with Car * class. */ public class RelationshipDemo { public static void main(String[] args) { Engine engine = new Engine(); MarutiSwift marutiSwift = new MarutiSwift("Red", 200, engine); marutiSwift.carInfo(); marutiSwift.startMarutiSwift(); } }
Car Color= Red, Max Speed= 200 Engine Started:To Download InheritanceDemo-HAS-A-CarApp Project Click the below link
https://sites.google.com/site/javaee4321/java/InheritanceDemo-HAS-A-CarApp.zip?attredirects=0&d=1
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