Please answer carefully don't miss the common interview question It must be asked at least once in any level of interview

Abstract class Interface
1) Abstract class can have abstract and non-abstract methods. Interface can have only abstract methods. Since Java 8, it can have default and static methods also.
2) Abstract class doesn't support multiple inheritance. Interface supports multiple inheritance.
3) Abstract class can have final, non-final, static and non-static variables. Interface has only static and final variables.
4) Abstract class can provide the implementation of interface. Interface can't provide the implementation of abstract class.
5) The abstract keyword is used to declare abstract class. The interface keyword is used to declare interface.
6) An abstract class can extend another Java class and implement multiple Java interfaces. An interface can extend another Java interface only.
7) An abstract class can be extended using keyword "extends". An interface can be implemented using keyword "implements".
8) A Java abstract class can have class members like private, protected, etc. Members of a Java interface are public by default.
9)Example:
public abstract class Shape{
public abstract void draw();
} Example:
public interface Drawable{
void draw();
}

Do VOTE fast

Example of abstract class and interface in Java
Let's see a simple example where we are using interface and abstract class both.

//Creating interface that has 4 methods
interface A{
void a();//bydefault, public and abstract
void b();
void c();
void d();
}

//Creating abstract class that provides the implementation of one method of A interface
abstract class B implements A{
public void c(){System.out.println("I am C");}
}

//Creating subclass of abstract class, now we need to provide the implementation of rest of the methods
class M extends B{
public void a(){System.out.println("I am a");}
public void b(){System.out.println("I am b");}
public void d(){System.out.println("I am d");}
}

//Creating a test class that calls the methods of A interface
class Test5{
public static void main(String args[]){
A a=new M();
a.a();
a.b();
a.c();
a.d();
}}

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▲illustration of data processing from raw to end user▲

◾its step by step process how data flows from data source.

• data source: data source is simply the source of the data.

•data loaders: data loader is a application for the bulk import or export of data.

•data lake: a data lake is a centralized repository designed to store, process, and secure large amounts of structured, semi structured, and unstructured data.

• data visualization: data visualization is a way to represent information graphically, highlighting patterns and trends in data.

• ml development: machine learning deals with the issue of how to build computer programs that improve their performance at some tasks through experience.
graphic credit: semantix (data platform)
◾this infographics delivers highly valuable information to understand the flow of data.
tags-
#data #engineering #analytics #science #intelligence #visualization #machinelearning #bigdata #dataengineering #computing #datascience #dataanalytics #datamining #ai #ml #learning