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A class is a user-defined blueprint or prototype from which objects are created. It represents the set of properties or methods that are common to all objects of one type. Using classes, you can create multiple objects with the same behavior instead of writing their code multiple times. This includes classes for objects occurring more than once in your code. https://www.javatpoint.com/microprocessor-introduction In general, class declarations can include these components in order: 

Modifiers: A class can be public or have default access (Refer to this for details).
Class name: The class name should begin with the initial letter capitalized by convention.
Superclass (if any): The name of the class’s parent (superclass), if any, preceded by the keyword extends. A class can only extend (subclass) one parent.
Interfaces (if any): A comma-separated list of interfaces implemented by the class, if any, preceded by the keyword implements. A class can implement more than one interface.
Body: The class body is surrounded by braces, { }.

An object is a basic unit of Object-Oriented Programming that represents real-life entities. A typical Java program creates many objects, which as you know, interact by invoking methods. The objects are what perform your code, they are the part of your code visible to the viewer/user. An object mainly consists of: 

State: It is represented by the attributes of an object. It also reflects the properties of an object.
Behavior: It is represented by the methods of an object. It also reflects the response of an object to other objects.
Identity: It is a unique name given to an object that enables it to interact with other objects.
Method: A method is a collection of statements that perform some specific task and return the result to the caller. A method can perform some specific task without returning anything. Methods allow us to reuse the code without retyping it, which is why they are considered time savers. In Java, every method must be part of some class, which is different from languages like C, C++, and Python. 

In prehistory, education happened informally through oral communication and imitation. With the rise of ancient civilizations, writing was invented, and the amount of knowledge grew. This caused a shift from informal to formal education. Initially, formal education was mainly available to elites and religious groups. The invention of the printing press in the 15th century made books more widely available. This increased general literacy. Beginning in the 18th and 19th centuries, public education became more important. This development led to the worldwide process of making primary education available to all, free of charge, and compulsory up to a certain age. Today, over 90% of all primary-school-age children worldwide attend primary school.

Checking Your Course Materials & Resources
In anticipation of starting a new semester it is always a good idea to check the materials you plan on using for your course. Here are a couple of pitfalls that could happen, and how you might protect yourself. 
 
1)    Where did that go?
Sometimes we link to library resources such as journal articles, books, or media and we expect that the link will be ‘good’ in perpetuity. However, over time things shift and change. It is a good idea to use stable links to ensure that your resources will be available to students when they select the link you have provided. Here is the library resource on using stable links in your course - https://libguides.lib.msu.edu/stablelinks
 
2)    It’s not the limits we set…
Some resources have a limit to the number of individuals who can access the resource at one time. It’s kind of like the olden days when there were only a few copies of a book in the library for hundreds of students. The same occurs in some digital resources. It is a good idea to ensure that your resources don’t have any restrictions, and if they do, that you are aware of these prior to adding these to your final syllabus or course reading list. Here is a library article to help with these situations - https://libguides.lib.msu.edu/c.php?g=917727&p=6913084
 
3)    Deadlines and other support help
If you are experiencing an issue with access or availability to course resources from the library, you should contact them as soon as possible in the planning process. MSU librarians are very skilled and knowledgeable about the availability of resources and suggestions for alternatives when necessary. Here is a link to help with course materials - https://libguides.lib.msu.edu/c.php?g=917727&p=6913084
 
 The aforementioned points are related to resources and materials available through the MSU library. It is always a good idea to check your links and access to third-party resources and materials that you have ‘used in the past’. Over time open and free resources can become fee-for-access (e.g., you will receive a 401 Unauthorized error), as well as being removed from the web entirely (e.g., the dreaded 404 ‘Not Found’ error). Checking these resources early can help you avoid last minute panic and scramble to find alternatives for your course.