Method readLines

android/guava/src/com/google/common/io/Files.java:543–562

Reads all of the lines from a file. The lines do not include line-termination characters, but do include other leading and trailing whitespace. <p>This method returns a mutable {@code List}. For an {@code ImmutableList}, use {@code Files.asCharSource(file, charset).readLines()}. <p><b>{@link java.

(File file, Charset charset)

   * @throws IOException if an I/O error occurs
   */
  public static List<String> readLines(File file, Charset charset) throws IOException {
    // don't use asCharSource(file, charset).readLines() because that returns
    // an immutable list, which would change the behavior of this method
    return asCharSource(file, charset)
        .readLines(
            new LineProcessor<List<String>>() {
              final List<String> result = new ArrayList<>();

              @Override
              public boolean processLine(String line) {
                result.add(line);
                return true;
              }

              @Override
              public List<String> getResult() {
                return result;
              }
            });
  }

  /**
   * Streams lines from a {@link File}, stopping when our callback returns false, or we have read