How can I use the Apex string replace method for replacing all occurrences in the Salesforce apex code?

n the context of Salesforce, here is how you can use the Apex replace method for replacing all occurrence of a specific substring within a given string with another in Salesforce apex code:-

This example would include a method which would task parameters for the original string, the substring to replace, and the replacement substring:-

Public class StringManipulationExample {
    // Method to replace all occurrences of a substring in a string
    Public static String replaceSubstring(String originalString, String substringToReplace, String replacementString) {
        // Check if the originalString and substringToReplace are not null or empty
        If (String.isNotBlank(originalString) && String.isNotBlank(substringToReplace)) {
            // Replace all occurrences of substringToReplace with replacementString
            Return originalString.replace(substringToReplace, replacementString);
        } else {
            // Handle null or empty input strings
            If (String.isBlank(originalString)) {
                System.debug(‘Error: Original string is null or empty.’);
            }
            If (String.isBlank(substringToReplace)) {
                System.debug(‘Error: Substring to replace is null or empty.’);
            }
            // Return originalString if either originalString or substringToReplace is null or empty
            Return originalString;
        }
    }
    // Example usage in a test method
    Public static void testReplaceMethod() {
        // Original string
        String originalString = ‘This is a sample string with some sample text.’;
        // Substring to replace
        String substringToReplace = ‘sample’;
        // Replacement string
        String replacementString = ‘example’;
        // Call the replaceSubstring method to replace all occurrences
        String modifiedString = replaceSubstring(originalString, substringToReplace, replacementString);
        // Print the modified string to debug logs
        System.debug(‘Modified String: ‘ + modifiedString); 
        // Output: ‘This is a example string with some example text.’
    }

}