Question

What method would you write to validate an input for a String variable to make sure it is not 'null' or empty? (i.e. in Person.java example)

Answer 1

A method to validate a String variable in a Java class ensures it is not null or empty by checking both conditions and returning true if both are satisfied. This method facilitates the safe handling of strings in subsequent operations.

Step-by-step explanation:

To validate a String variable in a Java class such as Person.java to ensure it is neither null nor empty, you would typically write a method that checks these two conditions. Here is an example of what that method might look like:

public boolean isValidString(String input) {
return input != null && !input.isEmpty();
}

This method returns true if the input is not null and the isEmpty() method returns false (meaning the String is not empty). It returns false if either condition is not met. You can then use this method to check any string before proceeding with operations that assume the string is not empty and not null.