第一题

Scanner sc = new Scanner(System.in);

ArrayList<Integer> list = new ArrayList<Integer>();

while (sc.hasNextInt()) {

    list.add(sc.nextInt());

}

第二题

Scanner sc = new Scanner(System.in);

ArrayList<Integer> list = new ArrayList<Integer>();

string s = sc.nextLine();

int k = sc.nextInt();

String[] numString = in.nextLine().split(" ");

for (String t:numString) {

    list.add(Integer.parseInt(t));

}