FileMismatchExample.java

public class FileMismatchExample {

    /*
    Here, hello1 and hello3 have same content, hello2 has different content.
     */
    public static void main(String[] args) {
        Path path1 = Path.of("hello1.txt");
        Path path2 = Path.of("hello2.txt");
        Path path3 = Path.of("hello3.txt");

        try {
            System.out.println(Files.mismatch(path1, path1)); // -1, as same file comparison
            System.out.println(Files.mismatch(path1, path2)); // 13, different files, different content
            System.out.println(Files.mismatch(path1, path3)); // -1, as same content
            System.out.println(Files.mismatch(path2, path3)); // 13, different files, different content
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}