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Java Polymorphism in Interfaces

GPS g          =    new Smartphone ( );  can only use GPS method 
Smartphones    =    new Smartphone ( );   can only use smartphone methods 

Implementing an Interface force method implementation



interface MyCamera2{
    void takeSnap();
    void recordVideo();
    private void greet(){
        System.out.println("Good Morning");
    default void record4KVideo(){
        System.out.println("Recording in 4k...");

interface MyWifi2{
    String[] getNetworks();
    void connectToNetwork(String network);

class MyCellPhone2{
    void callNumber(int phoneNumber){
        System.out.println("Calling "+ phoneNumber);
    void pickCall(){
        System.out.println("Connecting... ");


class MySmartPhone2 extends MyCellPhone2 implements MyWifi2, MyCamera2{
    public void takeSnap(){
        System.out.println("Taking snap");
    public void recordVideo(){
        System.out.println("Taking snap");
    //    public void record4KVideo(){
//        System.out.println("Taking snap and recoding in 4k");
//    }
    public String[] getNetworks(){
        System.out.println("Getting List of Networks");
        String[] networkList = {"Harry", "Prashanth", "Anjali5G"};
        return networkList;
    public void connectToNetwork(String network){
        System.out.println("Connecting to " + network);
    public void sampleMeth(){
public class polymorphism {
    public static void main(String[] args) {
        MyCamera2 cam1 = new MySmartPhone2(); // This is a smartphone but, use it as a camera
        // cam1.getNetworks(); --> Not allowed
        // cam1.sampleMeth(); --> Not allowed


        MySmartPhone2 s = new MySmartPhone2();


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