java interfaces Examples & Default method #defaultMethodInInterfaces смотреть онлайн

Interfaces are explained using examples along with default methods. Default methods are explained along with the reason they are used!

Default interface methods are an efficient way to deal with this issue. They allow us to add new methods to an interface that are automatically available in the implementations. Therefore, we don't need to modify the implementing classes.
Why Interfaces Need Default Methods
Like regular interface methods, default methods are implicitly public; there's no need to specify the public modifier.

Unlike regular interface methods, we declare them with the default keyword at the beginning of the method signature, and they provide an implementation.
write a program default method
how to set default method in interfaces
source code
package com.company;
interface MyCamera{
void takeSnap();
void recordVideo(); private void greet() {
System.out.println("Hello pakistan");
}

default void record4kVideo()
{
greet();

System.out.println("Taking Snap");

}
}

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

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

}

class MySmartPhone extends MyCellPhone implements MyWifi, MyCamera{
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 = {"Kafeel", "Muneeb", "ahmad"};
return networkList;
}
public void connectToNetwork(String network){
System.out.println("Connecting to " + network);
}
}

public class default_method_intrface {

public static void main(String[] args) {
// TODO Auto-generated method stub
MySmartPhone sc = new MySmartPhone();
sc.record4kVideo();
String [] ar= sc.getNetworks();
for(String item : ar) {
System.out.print(item);
}


}

}