java - 如何改用 ArrayList

Question

ArrayList 会比 Vector 更好用吗？我已尝试将所有 Vector 值的代码更改为 ArrayList，但我在 myTableModel 方法末尾的 return 语句中收到错误

编辑:为了澄清，我听说和读到一些人提到 2017 年 vector 的使用很差(首选 ArrayList)。对 Java 仍然很陌生，所以我的想法显然不在应该的地方(正如其他用户明确指出的那样):)

public static DefaultTableModel myTableModel(){
        csvData = new Vector();
    readInData();
    String header = csvData.get(0);
    String[] columns = header.split("[,]");
    Vector<String> colNames = new Vector<>();
    int columnCount = columns.length;
    for (int column = 0; column < columnCount; column++) {
        colNames.add(columns[column]);
    }
    Vector<Vector<Object>> data = new Vector<>();


    for(int j = 1 ; j < csvData.size() ; j++){
        String row = csvData.get(j);
        String[] elements = row.split("[,]");
            Vector<Object> vector = new Vector<>();
        for (int columnIndex = 0; columnIndex < columnCount; columnIndex++) {
            vector.add(elements[columnIndex]);
        }
        data.add(vector);
    }

    return new DefaultTableModel(data, colNames);

Answer 1

要简单!

public static DefaultTableModel myTableModel() {
    String[] csv = readInData();
    String[] columnNames = csv[0].split(",");
    Object[][] data = new Object[csv.length - 1][];

    for (int row = 1; row < data.length; row++)
        data[row] = csv[row].split(",");

    return new DefaultTableModel(data, columnNames);
}