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2. how can we write the code 3 classes for one div at a time?

   stackoverflow.com/questions/14273636

   Just to complement previous comments and answer : From the html point of view, you can add those three classes to one div at a time doing

3. How can I apply styles to multiple classes at once?

   stackoverflow.com/questions/2099252

   Using CSS pseudo-classes :is (previously :any and :matches) and :where, you can use comma to match multiple classes on any level. At the root level, :is(.abc, .xyz) and .abc, .xyz function almost identically. However, :is allows matching only a part of the selector without copying the whole selector multiple times.

4. The difference between Classes, Objects, and Instances

   stackoverflow.com/questions/1215881

   While the above answers are correct, another way of thinking about Classes and Objects would be to use real world examples: A class named Animal might contain objects like Cat, Dog or Fish. An object with a title of Bible would be of class Book, etc. Classes are general, objects are specific. This thought example helped me when I was learning Java.

5. jQuery: Toggling between 3 classes (initially) - Stack Overflow

   stackoverflow.com/questions/14200833

   All I need is to have a button that when clicked can cycle between 3 classes. But if the case arises to have to cycle through 4, 5 or more classes, that the script can be easily scaled. As of this moment I am able to 'cycle' between two classes which is basically more "toggling" than cycling, so for that I have: HTML:

6. java - How to write a 3 class program and have the main class...

   stackoverflow.com/questions/6808865

   I have to write a program with 3 classes and lots of different methods. I've written a simpler example to try and get an idea where I am going wrong. First class (music) is defining a music object with three data types. And should have a method to print the contents of an array.

7. java - Extending from two classes - Stack Overflow

   stackoverflow.com/questions/5836662

   Yea, as everyone else wrote, you cannot do multiple inheritance in Java. If you have two classes from which you'd like to use code, you'd typically just subclass one (say class A). For class B, you abstract the important methods of it to an interface BInterface (ugly name, but you get the idea), then say Main extends A implements BInterface.

8. What is the difference between an interface and abstract class?

   stackoverflow.com/questions/1913098

   abstract class establishes "is a" relation with concrete classes. interface provides "has a" capability for classes. If you are looking for Java as programming language, here are a few more updates: Java 8 has reduced the gap between interface and abstract classes to some extent by providing a default method feature.

9. Calling parent class __init__ with multiple inheritance, what's...

   stackoverflow.com/questions/9575409

   If the order of the base classes is wrong, the mixin's constructor will never be called. All base classes are designed for cooperative inheritance. Classes designed for cooperative inheritance are a lot like mixins: They pass through all unused arguments to the next class.

10. Multiple .class files generated for a class? - Stack Overflow

    stackoverflow.com/questions/1031962

    anonymous inner classes (which in fact are plain inner classes without a name) package access interfaces and classes before and after your main class. You can have an arbitrary number of package access classes and interfaces in a single Java source file. Usually small helper objects that are only used by the class are just put into the same file.

11. class - What is the difference between old style and new style...

    stackoverflow.com/questions/54867

    The major motivation for introducing new-style classes is to provide a unified object model with a full meta-model. It also has a number of immediate benefits, like the ability to subclass most built-in types, or the introduction of "descriptors", which enable computed properties. For compatibility reasons, classes are still old-style by default.