Syntax
String fileName = "<file_name.txt>";
// loading into List
List<String> lines = Files.readAllLines(Path.of(fileName));
// loading into Stream
Stream<String> lines = Files.lines(Path.of(fileName));
Example: Loading into List
import java.nio.file.*;
import java.util.List;
public class ReadLineByLine {
    public static void main(String[] args) {
        String fileName = "<file_name.txt>";
        try {
            List<String> lines = Files.readAllLines(Path.of(fileName));
            System.out.print(lines);
        } catch (Exception e) {
            System.out.println("Error while reading text file");
            System.out.println(e.toString());
        }
    }
}
Output
Content from textfile:
[Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. , At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. , Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. , At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.]
Example: Loading into Stream
import java.nio.file.*;
import java.util.stream.*;
public class ReadLineByLine {
    public static void main(String[] args) {
        String fileName = "<file_name.txt>";
        try {
            Stream<String> lines = Files.lines(Path.of(fileName));
            lines.forEach(System.out::println);
            lines.close();
        } catch (Exception e) {
            System.out.println("Error while reading text file");
            System.out.println(e.toString());
        }
    }
}
Output
Content from textfile:
[Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. , At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. , Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. , At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.]