Structure of the class

The structure of the class includes syntax that contains the combination of the access modifiers, sharing modes, class name, and also class body, we may look at all the further options.

Modifiers 

Salesforce apex classes include three kinds of access modifiers, they are private, public and global.

• Private: When we declare our access modifier as private, then the class will be known for local only. We cant access our class outside of the particular piece as default classes have these modifiers. 
• Public: When we declare our class as public, that will be accessible for all codes of apex irrespective of our organization, if we have defined methods along with web services keyword, we have to declare the containing class with the global keyword. 
• Global: When we declare our class as global, we will gain access to all apex codes irrespective of our organizations. If we have defined a method with a web service keyword, we must declare a containing class with the global keyword. 

Sharing modes of the class

It allows different methods for sharing the class they are, with sharing, which give respect for the user access settings and profile permissions. 

• Without sharing: When a user doesn’t have accessed at least 10 records from 30, then all the 30 will update the running class in system mode. Which is defined with the without sharing keyword known as system mode.
• Virtual: when we use the keyword virtual that indicates the class, that can allow extend and override. When methods need overridden, then they should declare with the keyword virtual.
• Abstract: When we declare the class as abstract, it contains only signatures of methods which are not actual implementations. 

Class methods and constructions

For defining methods, we need to specify the following.

• Need modifiers like public or private, which may be optional.
• Value of the returned data by the methods like string or integer, when the method doesn’t return the value we can use Void.
• It requires a list of input parameters that are used for the method, which is separated by commas, and enclosed in parenthesis. When there are no parameters, we may use the set of empty parentheses. 
• Methods body requires to enclose in braces, the code of the method includes the local declaration. 

We can use the following syntax for defining methods.

Variables

We need to follow to specify the following to declare the variable. 

• It allows modifiers like public, final, and static. 
• It includes data types like string and boolean, and the variable requires the name and value.
• The following is the syntax to defining a variable.

Apex properties 

It is similar to variables. We can do additional things with code for the property value before it returned. Those properties may use to validate the date just before when the data are changed. We need to follow this syntax in the body to declare a property. 

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Salesforce Apex Pros

There is no need for purchasing the infrastructure. It provides security for applications with full authentication for the process to access the applications. It is easy to develop that exist on applications, which provides on demand and different tenant salesforce back end databases. 

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Salesforce Apex  Cons

Unlike other programming languages it is not easy to create threads, not possible for temporary files in apex. Which is important to keep in mind that the application created by them must be able to handle multiple documents, and all the requests return a huge collection of records from the database, those cannot show elements on the user interface. 

Conclusion:

Class is a blueprint from where objects are created, these classes are similar to java classes. Invoice processor describes the class with all actions and methods which can be performed on the invoice, that is in context. Knowledge and development of the platform are required, apex is one of the best programming languages That has to be used with salesforce, Which assumes it like we already have set up salesforce to be used for our apex programming.

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