java - 需要从文件创建对象并将其放入数组中

Question

我试图为每一行文本创建一个对象，并在创建每个对象时将其放入一个数组中。我正在努力将其放入数组中。这是我的代码:

    File inFile = new File("shareholders.txt");
    Scanner inputFile = new Scanner(inFile);
    String str;
    Shareholder shareholder = new Shareholder();

    while (inputFile.hasNext()) {

        str = inputFile.nextLine();
        String tokens[] = str.split(",");
        shareholder.setID(tokens[0]);
        shareholder.setName(tokens[1]);
        shareholder.setAddress(tokens[2]);
        shareholder.setPortfolioID(tokens[3]);

    }

Answer 1

如果你有固定数量的股东，你可以这样做 -

  File inFile = new File("shareholders.txt");
    Scanner inputFile = new Scanner(inFile);
    String str;
    int i=0;
    Shareholder[] shareholder = new Shareholder[n];

    while (inputFile.hasNext()) {
        str = inputFile.nextLine();
        String tokens[] = str.split(",");
        shareholder[i++] = new Shareholder(tokens[0],tokens[1],tokens[2],tokens[3]);
    }

或者如果不知道股东人数，那么您可以使用列表 -

File inFile = new File("shareholders.txt");
Scanner inputFile = new Scanner(inFile);
String str;
List<Shareholder> list = new ArrayList<>();

while (inputFile.hasNext()) {
    Shareholder shareholder = new Shareholder();
    str = inputFile.nextLine();
    String tokens[] = str.split(",");
    list.add(new Shareholder(tokens[0],tokens[1],tokens[2],tokens[3]));
}