使用多個掃描儀失敗 - Java

Question

我遇到掃描儀類的問題。我有幾個方法從用戶讀取某些輸入，但是在調用第一個方法之後，其他方法會崩潰（無法讀取輸入）。我搜索瞭解決方案，它看起來像添加「scanner.nextLine（）」將解決問題，但它沒有。

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]); 
    } 

輸出：

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

Answer 1

你沒有得到來自任何scanner（在main方法），因爲你已經關閉System.in（收盤input時，在getPlayersNames方法結束）。

您不應該自己關閉System.in，因爲它會阻止將來嘗試從此流讀取任何內容。