Вставка элементов массива строк в список

я считаю, что эта функция может вам помочь

 public String[] addString (String[] a , String c){

    List<String> list = new ArrayList<String>();
    if (a == null){

        list.add(c);

        String[] b = new String[list.size()];

        for (int j = 0 ; j<list.size() ; j++){
            b[j] = list.get(j);
        }
        return b;

    }else {
        for (int i = 0 ; i<a.length ; i++) {
            list.add(a[i]);
        }
        list.add(c);

        String[] b = new String[list.size()];

        for (int j = 0 ; j<list.size() ; j++){
            b[j] = list.get(j);
        }

        return b;

    }



}

используйте for () для добавления вашего массива

Этот код поможет вам получить правильный результат. Если я возьму этот массив строк в качестве примера: java

public <T> List<T> twoDArrayStringToList(T[][] dataArray) {
    List<T> list = new ArrayList<T>();
    for (T[] array : dataArray) {
        list.addAll(Arrays.asList(array));
    }
    return list;
}
public static void main(String args[]){

     String dataArray[][] = {{"Jones","Commercial","123 Mitchell","Arlington","Texas","76019","120000", "sales", "21000"},
             {"Smith","Residential","61 Bose Lane","Dallas","Texas","75002","310000", "65656"},
             {"Jones","Commercial","2500 West Seventh St"," Fort Worth","Texas","76015","575000","food", "15750"},
             {"Smith","Commercial","1225 Green Rd","Euless","Texas","76000","215500","entertainment","9500"},
             {"Jones","Residential","5214 Linda Lane","Houston","Texas","77700","195775", "98541"}};

     System.out.println(twoDArrayStringToList(dataArray));

}

[Jones, Commercial, 123 Mitchell, Arlington, Texas, 76019, 120000, sales, 21000, Smith, Residential, 61 Bose Lane, Dallas, Texas, 75002, 310000, 65656, Jones, Commercial, 2500 West Seventh St, Fort Worth, Texas, 76015, 575000, food, 15750, Smith, Commercial, 1225 Green Rd, Euless, Texas, 76000, 215500, Entertainment, 9500, Jones, Residential, 5214 Linda Lane, Houston, Texas, 77700, 195775, 98541]