Writing here to clearing engineering concept of a software for future reference.
Example for Class, Constructors and Methods:
Main.java
public static void main(String[] args)
{
User user=new User("Zaki",30);
//user.name="Zaki";
//System.out.println(user.name);
user.sayHello();
}
User.java
public class User{
//defining the attribute
public String name;
//constructor creation
public User(String name, int age){
this.name=name;
}
//method creation
public void sayHello{
System.out.println("This is "+name);
}
//a interface is a contract a capability that a class should provide
//interface we can build loose coupled calculator
}
Interface Example
