File read/write

//--------------------
// file write
//--------------------

//ref : https://www.baeldung.com/java-write-byte-array-file

try (FileOutputStream fos = new FileOutputStream("pathname")) { fos.write(myByteArray); }
java.io.FileOutputStream os = new java.io.FileOutputStream("d:/para.class"); os.write(arg1); os.close()
Files.write(outputFile.toPath(), dataForWriting);

//--------------------
// file read
//--------------------
// ref : https://www.baeldung.com/java-csv-file-array

// 1.
List<List<String>> records = new ArrayList<>();
try (BufferedReader br = new BufferedReader(new FileReader("book.csv"))) {
    String line;
    while ((line = br.readLine()) != null) {
        String[] values = line.split(COMMA_DELIMITER);
        records.add(Arrays.asList(values));
    }
}

// 2.
List<List<String>> records = new ArrayList<>();
try (Scanner scanner = new Scanner(new File("book.csv"));) {
    while (scanner.hasNextLine()) {
        records.add(getRecordFromLine(scanner.nextLine()));
    }
}

private List<String> getRecordFromLine(String line) {
    List<String> values = new ArrayList<String>();
    try (Scanner rowScanner = new Scanner(line)) {
        rowScanner.useDelimiter(COMMA_DELIMITER);
        while (rowScanner.hasNext()) {
            values.add(rowScanner.next());
        }
    }
    return values;
}

// ref : https://www.baeldung.com/java-file-to-arraylist

// 1.
ArrayList<String> result = new ArrayList<>();
try (BufferedReader br = new BufferedReader(new FileReader(filename))) {
    while (br.ready()) {
        result.add(br.readLine());
    }
}

// 2.
List<String> result = Files.readAllLines(Paths.get(filename));

// ref : https://www.baeldung.com/reading-file-in-java

// 1.
Path path = Paths.get("src/test/resources/fileTest.txt");
BufferedReader reader = Files.newBufferedReader(path);
String line = reader.readLine();

// 2.
private static String read(java.lang.String file) throws Exception {
  Path path = Paths.get(<>.class.getClassLoader().getResource(file).toURI());
  try (Stream<String> lines = Files.lines(path)) {
  return lines.collect(Collectors.joining("\n"));
  }
}

// 3.
Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
Stream<String> lines = Files.lines(path);
String data = lines.collect(Collectors.joining("\n"));
lines.close();

// 4.
String file = "src/test/resources/fileTest.txt";
Scanner scanner = new Scanner(new File(file));
scanner.useDelimiter(" ");
scanner.hasNext();