import java.io.IOException;
import java.util.Arrays;
* CSVReader} provides a stateful API for streaming individual CSV rows
Copyright By PowCoder代写 加微信 powcoder
* as arrays of strings that have been read from a given CSV file.
* @author YOUR-NAME-HERE
public class CSVReader {
@SuppressWarnings(“unused”)
private static final long serialVersionUID = 5130490650040L;
private final CharacterReader reader;
public CSVReader(CharacterReader reader) {
this.reader = reader;
* This method uses the class’s CharacterReader} to read in just enough
* characters to process a single valid CSV row, represented as an array of
* strings where each element of the array is a field of the row. If formatting
* errors are encountered during reading, this method throws a
* CSVFormatException} that specifies the exact point at which the error
* occurred.
* @return a single row of CSV represented as a string array, where each
* element of the array is a field of the row; or null} when
* there are no more rows left to be read.
* @throws IOException when the underlying reader encountered an error
* @throws CSVFormatException when the CSV file is formatted incorrectly
public String[] readRow() throws IOException, CSVFormatException {
return null;
* Feel free to edit this method for your own testing purposes. As given, it
* simply processes the CSV file supplied on the command line and prints each
* resulting array of strings to standard out. Any reading or formatting errors
* are printed to standard error.
* @param args command line arguments (1 expected)
public static void main(String[] args) {
if (args.length != 1) {
System.out.println(“usage: CSVReader
* This block of code demonstrates basic usage of CSVReader’s row-oriented API:
* initialize the reader inside try-with-resources, initialize the CSVReader
* using the reader, and repeatedly call next() until null is encountered. Since
* CharacterReader implements AutoCloseable, the reader will be automatically
* closed once the try block is exited.
var filename = args[0];
try (var reader = new CharacterReader(filename)) {
var csvReader = new CSVReader(reader);
String[] row;
while ((row = csvReader.readRow()) != null) {
System.out.println(Arrays.toString(row));
} catch (IOException | CSVFormatException e) {
System.err.println(e.getMessage());
e.printStackTrace();
程序代写 CS代考 加微信: powcoder QQ: 1823890830 Email: powcoder@163.com