使用StringTokenizer将.txt文件转换为二维数组

File file = new File("file.txt");
FileReader fileReader = new FileReader(file);
BufferedReader bufferedReader = new BufferedReader(fileReader);

ArrayList<String> lines = new ArrayList<>();
String line;
while ((line = bufferedReader.readLine()) != null) {
    lines.add(line);
}

int numRows = lines.size();
int numCols = new StringTokenizer(lines.get(0)).countTokens();
String[][] array = new String[numRows][numCols];

for (int i = 0; i < numRows; i++) {
    StringTokenizer tokenizer = new StringTokenizer(lines.get(i));
    for (int j = 0; j < numCols; j++) {
        array[i][j] = tokenizer.nextToken();
    }
}

bufferedReader.close();