如何从dart中的变量列表中获取值

void main() {
  List<int> numbers = [1, 2, 3, 4, 5];
  int firstNumber = numbers[0]; // 获取第一个元素
  print(firstNumber); // 输出: 1
}

void main() {
  List<int> numbers = [1, 2, 3, 4, 5];
  int thirdNumber = numbers.elementAt(2); // 获取第三个元素
  print(thirdNumber); // 输出: 3
}

void main() {
  List<int> numbers = [1, 2, 3];
  int invalidNumber = numbers[3]; // 索引越界
}

void main() {
  List<int> numbers = [1, 2, 3];
  int index = 3;
  if (index < numbers.length) {
    int validNumber = numbers[index];
    print(validNumber);
  } else {
    print('Index out of range');
  }
}