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Convert the case of a string in apex

In an enterprise application, data stored in the database must follow a consistent format. The Apex case conversion methods help in formatting characters by converting them to either lowercase or uppercase based on the circumstances.

Apex provides two built-in methods for case conversion:

toUpperCase() which converts all characters to uppercase.
toLowerCase() which converts all characters to lowercase.

Following is an example of converting the case of a string to uppercase in apex:

In the above example:

In the above example, inputString, is a string variable with the default value 'Hello World'.
The toUpperCase() method is used to convert all characters in inputString to uppercase.
The variable outputString stores the result of the string conversion, which is then printed in the output using the system.debug() statement.

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