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.
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