The compareTo() method in Java is essential for comparing values, especially strings and objects, to determine their order in sorting operations.
It compares two objects based on certain criteria and returns an integer result indicating whether one is greater, equal, or less than the other.
Using compareTo() provides a more accurate comparison than basic operators like == or <, especially for complex data types, ensuring reliable sorting and filtering.
Java String format complements compareTo() by helping to present comparison results clearly and professionally, enhancing the output readability for developers and users.