singhrahuldps

CommunicationDriver cd = new Bluetooth();
		
cd.connectDevice("OnePlus");
		
cd.sendFile("Downloads/image.jpg");
		
cd.receiveFile();
		
cd.disconnectDevice();

singhrahuldps

public class Bluetooth implements CommunicationDriver{

	String connectedDevice;
	
	@Override
	public void connectDevice(String deviceName) {
		this.connectedDevice = deviceName;
		System.out.println("Connected to " + this.connectedDevice);
	}
	

singhrahuldps

public interface CommunicationDriver {
  
	void connectDevice(String deviceName);
	
	default void disconnectDevice() {
		System.out.println("Device disconnected");
	}
	
	void sendFile(String filePath);
	

singhrahuldps

// We can't create an object of Device class
// Device device = new Device(); is not allowed
Device mp = new MediaPlayer();
		
mp.switchOn();
		
mp.switchOff();

singhrahuldps

// A Media Player IS A Device
public class MediaPlayer extends Device{

	boolean turnedOn;
	
	// In absence of super() statement, java automatically adds one during compilation
	public MediaPlayer() {
		this.turnedOn = false;
	}

singhrahuldps

public abstract class Device {
	
	abstract void switchOn();
	
	abstract void switchOff();
	
}

singhrahuldps

Tiger tiger = new Tiger(10, "Bengal Tiger");
		
tiger.eatFood("Deer");
		
tiger.printDetails();
		
tiger.roar();

singhrahuldps

public class Tiger extends Animal {
	
	// All data members are inherited from Animal class
	// We specify additional data member specific to Tiger
	String tigerSpecies;
	String lastPrey;
	
	public Tiger(int age, String tigerSpecies) {
		// the constructor for the superclass must be defined
		// super() must be the first line in the constructor of base class

singhrahuldps

// Extends Object Class by default
public class Animal {
	
	public static enum FoodHabits{
		CARNIVORE(0), HERBIVORE(1), OMNIVORE(2);

		private int index;

		public int getIndex() {
			return index;

singhrahuldps

// Program to return average of numbers
public static double doAverage(ArrayList<Integer> marks) {
	// double for more precision than Integer during division
	double avg = 0.0;
	
	for(int mark: marks) {
		avg += mark;
	}
	// size() method returns the number of elements in array
	avg = avg/marks.size();