Input Validation for Non-String Data Types

[sanvviratthore]

The current implementation of the contains method does not perform any input validation. As a result, it may lead to unexpected behavior or runtime exceptions if non-string data types are passed as arguments. This can occur when:

• Users mistakenly pass null, which can lead to a NullPointerException.

To enhance the robustness of the isContains method, consider implementing the following input validation measures:

1. Null checks: Before processing the input strings, check if either string is null. If so, return an appropriate message or boolean value indicating that the operation cannot be performed. For example:

if (str1 == null || str2 == null) {
throw new IllegalArgumentException("Input strings cannot be null.");
}

2. String Empty Checks: Check if the strings are empty before proceeding. An empty string might lead to confusion regarding whether it contains another string.

if (str1.isEmpty() || str2.isEmpty()) {
throw new IllegalArgumentException("Input strings cannot be empty.");
}

• This will improve reliability and enhanced user experience.