Java Tutorial: Abstract Classes Vs Interfaces

In this video we will see what the differences between abstract classes and interfaces are. Interfaces in java are very important to achieve the effect of multiple inheritance. Make sur to download the notes at the end of this chapter.
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8:27

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[@nikeco7883]

// Interfaces
interface BikeF1{ //BikeF1 means 1st feature of Bike...folows....
void speedUp(int increment);
void speedDown(int decrement);
}
/*
interface BikeF2{
void horn1();
void horn2();
}
*/
interface BikeF3{
void gearUp(int increment);
void geardown(int decrement);
}
class Fz implements BikeF1, BikeF3{
public void speedUp(int increment){
System.out.println("The speedUp is "+ increment);
}
public void speedDown(int decrement){
System.out.println("The speedDown is " + decrement);
}
public void gearUp(int increment){
System.out.println("The gear should go when speed goes Up " + increment);
}
public void geardown(int decrement){
System.out.println("The gear should go down when speed goes Down " + decrement);
}
}
public class Interfaces{
public static void main(String [] args){
Fz myfz= new Fz();
myfz.speedUp(100);
myfz.gearUp(5);
myfz.speedDown(20);
myfz.geardown(2);
}
}
Output:
The speedUp is 100
The gear should go when speed goes Up 5
The speedDown is 20
The gear should go down when speed goes Down 2

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In summary, abstract classes are used to provide a base class for concrete subclasses to inherit from, while interfaces are used to define a set of methods that a class must implement. Abstract classes can have implemented and abstract methods, while interfaces can only have abstract methods.

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Java
According to me

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