如何將 ArrayList 轉換為 Java 中的二維數組 7

Question

I am trying to convert a Integer list in a 2D array in java 7. I first converted a String list to Integer and then Integer list to 2D array. 然后我會根據需要做更多的操作。 我累的是

List<String> list = Arrays.asList("1110", "1010", "1011", "1110");
    List<Integer> intList = new ArrayList<>();
    for (String s : list) {
        intList.add(Integer.valueOf(s));
    }
    //the problem is from here
    int[][] array = new int[intList.size()][];
    for (int i = 0; i < list.size(); i++) {
        for (int j = 0; j < list.size(); j++) {
            array[i][j] = intList.get(j + (list.size() * i));
        }
    }

I tried solving my issue looking at this Converting an ArrayList into a 2D Array and this Convert ArrayList into 2D array containing varying lengths of arrays but majority of the answers are given in java 8 which I don't want? 我知道這是一個基本問題，但我被困住了！ 有人可以幫我解決這個問題嗎？ 提前致謝！

生成的二維數組應該像

1110

1010

1011

1110

Answer 1

您可以使用.charAt()在每個字符串中獲取 position 的字符。

List<String> list = Arrays.asList("1110", "1010", "1011", "1110");
int[][] array = new int[list.size()][list.get(0).length()];
for (int i = 0; i < list.size(); i++) {
    for (int j = 0; j < list.get(i).length(); j++) {
        array[i][j] = list.get(i).charAt(j)-'0';
    }
}