java - 将文本文件写入数组列表-ArrayIndexOutOfBoundsException错误

Question

文本文件：

Europe, France, Paris

Asia, China, Beijing
Africa, Congo

我正在尝试将此txt文件写入数组列表。我在第四行出现错误。

public class Address {
private String continent;
private String country;
private String city;

public Adresa(String continent, String country, String city) {
    this.continent = continent;
    this.country = country;
    this.city = city;
}

private static List<Address> readAddressFromFile(String fileName) {
    List<Address> addresses = new ArrayList<>();
    Path pathToFile = Paths.get(fileName);

    try (BufferedReader br = Files.newBufferedReader(pathToFile, StandardCharsets.UTF_8)) {
        String line = br.readLine();
        while (line.length() > 0) {
                String[] attributes = line.split(", ");
                Address address = createAddress(attributes);
                addresses.add(address);
                line = br.readLine();
        }

    } catch (IOException ioe) {
        ioe.printStackTrace();
    }

    return addresses;
}

private static Adresa createAddress(String[] metadata) {
    String continent = metadata[0];
    String country = metadata[1];
    String city = metadata[2];
    return new Address(continent, country, city);
}

我懂了


“ ArrayIndexOutOfBoundsException：2”


错误，因为我在第四行只有2个元素。我该如何解决？

Answer 1

我建议您在第三个元素上添加一个if

private static Adresa createAddress(String[] metadata) {
    String continent = metadata[0];
    String country = metadata[1];
    String city = "";
    if(metadata.length>2){
        city = metadata[2];
    }
    return new Address(continent, country, city);
}