Java Programming language, which is one of the topmost languages which are in use is a multiplatform language. It is easy to start with Java for beginners. Java is used for creating web applications, and mobile applications especially android mobile applications. Developers find it easy to work with Java, as its features are of great support. There are many features in Java that make it easier for developers. One of the main features of its class.
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A class in Java Programming language means a logical template that can create objects. These templates share common properties and methods. If we take all objects in the same class, all of them will have the same properties and methods. For example in the real world, we say cars. It is an object which belongs to the class “Cars”. All cars in the class share only some common characteristics in the same template. But in the case of Java Classes, the car class will be a blueprint. It contains all indu=ividual characters a car will generate. This is called Java programming. So the user cannot create a bridge out of car class because it doesn’t possess any individual character of the bridge in the car class. In short classes are logical templates.
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Types of Class in Java
We discuss class earlier. These can be termed logical templates which help the users to create templates. A class declaration can be made up of class name, modifiers, superclass, implemented interfaces, appropriate keywords, and class body. To create a new object in a class, constructors are needed. The behavior of these classes is implemented by methods. In java classes, three variables are used. Local Variables, Instance variables, and Class Variables. Local variables are temporary variables. Instance variables are variables that can be accessed from inside any method. Class variables are static variables.
When it comes to coding Java classes are important. Let us discuss the Type of classes in java.
- POJO Class
POJO when expanded Plain Old Java Object. POJO class contains only private variables. Setter and Getter’s method is used for these variables. POJO Class will not extend to pre-specified classes. And this class should not implement pre-specified interfaces. And it should not include any pre-specified annotations. Another important thing in this POJO type class in java is that it should not have a no-argument constructor.
- Static Class
Another type of class in Java is the Static class. Static is a keyword used in Java that describes how the objects are managed in the memory. A static object exclusively belongs to a specific class. It does not belong to the instances of the class. This class contains only static members. Users cannot create an object for the static class.
- Concrete Class
Another important type of class in Java is the concrete class. The concrete class can be defined as any class which doesn’t have any abstract class. Or in other words, it can be said that any class which having an implementation for all its methods. Concrete lass does not have any unimplemented methods. A concrete class is said as a complete class.
- Abstract Class
In abstract class, it is described with an abstract keyword. It has zero or more abstract methods. Abstract classes are also incomplete classes. It may have static methods and constructors.
- Final Class
A final keyword cannot be overridden by any subclasses. If a variable is declared as final, its value will the same all the time. This helps in creating immutable classes like strings.
- Inner Class
As the name suggests inner class can be defined as a class that is a member of another class. Inner classes are of four types. They are nested inner class, method local inner class, anonymous inner class, and static nested class.
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The main method of Java is the entry point of any Java program. The syntax of the java main method is the public static void main (string[ ] args). The public is the access modifier. The min method has to be static. The java main method is called main.
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Conclusion
Java classes are an important thing in the coding process. These classes are of different types having different characters. The types of classes in Java and the public main class in java are explained above.
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