java - 使用多个扫描仪失败 - Java

Question

我对 Scanner 类有疑问。我有一些方法可以读取用户的某些输入，但是在调用第一个方法后，其他方法会崩溃(无法读取输入)。我搜索了解决方案，看起来添加“scanner.nextLine()”可以解决问题，但事实并非如此。

public class GameController {

private int numberOfPlayers = 2;

private Board board = new Board('.');
String players[] = new String[numberOfPlayers];
char playersMarkers[] = new char[numberOfPlayers];

public void getPlayersNames() {
    Scanner input = new Scanner(System.in);

    for (int i = 0; i < players.length; i++) {
        System.out.print("Insert player " + (i + 1) + "'s name: ");
        players[i] = input.nextLine();
    }
    input.nextLine(); // <- this one was suppose to solve the problem
    input.close();
}


public static void main(String[] args) {

    GameController gc = new GameController();
    gc.getPlayersNames();

    Scanner scanner = new Scanner(System.in);

    int array[] = new int[5];
    for (int i = 0; i < array.length; i++) {
        if (scanner.hasNext()) {
        array[i] = scanner.nextInt();
        }
    }

    scanner.close();

    for (int i = 0; i < array.length; i++) {
        System.out.println(array[i]);
    }

输出:

Insert player 1's name: John
Insert player 2's name: George
1
0
0
0
0
0

Answer 1

您没有从 scanner 中获取任何内容(在 main 方法中)，因为您已经关闭了 System.in(在关闭 时)输入，在 getPlayersNames 方法的末尾)。

您不应自行关闭 System.in，因为它会阻止将来尝试从此流中读取数据。