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Class in java
4.39
Beginner level
1.5 learning hrs
Instructor:
Pragya P
About this course
Java is a high-level, class-based, object-oriented programming language designed with as few implementation dependencies as possible to develop distributed applications running on the Internet. But what exactly do the terms “classes” an “objects” mean and signify? In simple words, a Class in Java is a user defined blueprint or prototype from which Objects are created. It represents the set of properties or methods that are common amongst all Objects of one particular type.In a process of learning programming using java, the first pillar itself is learning about Classes and Objects. Understanding what is a class programmatically and also connecting it to real scenarios is essential. How to create class, encapsulation, inner class and other OOP features and how they are implemented using a Class in java is to be undesrstood through this course.
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Course outline
Introduction to a Class
Requirement of a Class
Elements of a Class
Defining a Class
Memory allocation
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4.39
Our course instructor
Pragya P
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Frequently Asked Questions
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What is a class in Java?
A class — within the context of Java — can be defined as a template that helps to create objects and to define object data types and methods. Classes are categories defined by a user or a programmer, and objects are items within each category. All class objects should have basic class properties.
Core properties include the attributes/values and methods which will be employed by the thing. Generally, a category may be a blueprint supported by which we create our data structures or some advanced codes.
What are the 3 parts of a class in Java?
Here are three major components of sophistication in Java.
1) Variable : Variable may be a reserved memory location to carry a worth. In other words, once we want to store any value and provide it with a reputation, that value takes a reserved space in memory, and it's called a variable.
2) Constructor : A constructor is a type of a special method in Java, or any object-oriented programming language, which is employed to initialize an object of a defined class and Constructor is essential for each Java class, and if we don't declare the constructor, the compiler creates a default constructor of a java class.
A constructor must be an equivalent name to a Java class. It doesn't have a return type.
What is the difference between class and object in Java?
Class in java can be defined as the category and objects are the products within that category.
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Class In Java
Class in java or any object-oriented language is essential because, with classes, an object-oriented language would not work. What is an object-oriented programming language? If you are a beginner, you would not understand class that well, so let’s understand what Object-oriented programming language is.
There are generally four types of programming languages- Procedural Programming language, Functional programming language, Object-oriented programming language, and Scripting programming language.
Procedural programming language is a process-oriented programming language, it always revolves around the process, and when it comes to development, this language is not that useful when it comes to development.
Then comes functional programming language, which is good, but it takes a lot of effort when we use it during development. This is because, while using it in our code, we must write several codes to get our work done.
The scripting language is used to make work automated in operating systems such as Linux. This is really helpful but not for development.
Then comes the Object-oriented programming language, which is a huge part of the coding community. It is used around the world to create web applications, mobile applications, server-side applications, and many more. What is the meaning of Object-oriented programming language? Why do we need object-oriented language?
In object-oriented languages such as Java, Python, and C++, we think of everything as an object. For example, we are solving some problems on the tree. The tree is a data structure. The tree is a data structure that is created using nodes, and we think of nodes as real objects, so we create a node class and use that class in the whole program, which helps us in reducing the size of the program and work efficiently.
This class in java course is going to teach you everything related to Java classes. But, how does class in java assist us while coding for the products or solving critical problems?
A class assists us in creating user-defined data types. A class may be a group of objects which have common properties. It's a template or blueprint from which objects are created. It's a logical entity. It cannot be physical.
For example, when a building or an apartment is created, a builder creates a map/outline of the building, then he starts with the real construction. While construction, he begins with creating the 1st flat and based on the structure of that flat, he can easily create the other flats on that building. So, in this example, the flat is the class, and the building is the java program. So, I think you are clear with the use of class in java. Since java is an object-oriented language, we firstly create a java class, and, in that class, we can create some user-defined datatypes and as well as useful functions too.
These classes also have some modifiers to make our work easy.
You must be thinking, what are the modifiers? Modifiers help us limit class access. Using modifiers, we can control who is going to have access to class data. There are two sorts of modifiers in Java: access modifiers and non-access modifiers.
The access modifiers in Java specify the accessibility or scope of a field, method, constructor, or class. We will change the access level of fields, constructors, methods, and classes by applying the access modifier thereon.
There are four sorts of Java access modifiers:
Private: The access level of a personal modifier is merely within the category. It can't be accessed from outside the category.
Default: The access level of a default modifier is merely within the package. It can't be accessed from outside the package. If you do not specify any access level, it'll be the default.
Protected: The access level of a protected modifier is within the package and out of doors the package through child class. If you are doing not making the kid class, it can't be accessed from outside the package.
Public: The access level of a public modifier is everywhere. It is often accessed from within the category, outside the category, within the package, and out of doors the package.
You are going to learn these things also in this class in the java course. This class in java course has all the required information to give a kickstart to your java journey. This course is for beginners and as well as for intermediate students who want to brush up their class in java knowledge and move to some advanced topics. Classes are very important for someone who is thinking of making a career in software development core. This knowledge can help you reach the goals you are dreaming of achieving and join a product-based company such as Google or Amazon.