試圖打印出一個數組作爲文件？

Question

我有一個數組中的迷宮板，但似乎無法弄清楚如何將其保存爲一個txt文件，然後打印出來？

String [][] board = new String [][] { 
     {"#","#","#"," "," ","#" ,"#","#","#"}, 
     {"#","#"," ","#"," ","#","#"," ","#"}, 
     {"#"," "," "," ","#"," "," "," "," "}, 
     {"#","#","#","#","#","#","#"," ","#"}, 
    }; 

    System.out.println(Arrays.toString(board)); 

    File boardFile = new File("board.txt"); 
    PrintWriter boardPW = new PrintWriter(boardFile); 
    boardPW.println(board); 
    Scanner scan = new Scanner(boardFile); 
    while(scan.hasNextLine()) { 
     System.out.println(scan.nextLine()); 

    } 

我覺得這是完全錯誤的，但它值得一試！哈哈

Answer 1

有兩點需要指出：

打印出Java數組時

1. ，你需要去通過他們，並打印每個元素 - 打印陣列println(board);的名字不會給你想要的結果。
2. 當使用Printwriters寫入文件時，請記得關閉它們。

我還添加了try/catch塊，但是我假設你使用了一個拋出異常的方法？

更新的代碼：

String [][] board = new String [][] { 
     {"#","#","#"," "," ","#" ,"#","#","#"}, 
     {"#","#"," ","#"," ","#","#"," ","#"}, 
     {"#"," "," "," ","#"," "," "," "," "}, 
     {"#","#","#","#","#","#","#"," ","#"}, 
    }; 

    File boardFile = new File("board.txt"); 
    try{ 
     PrintWriter boardPW = new PrintWriter(boardFile); 
     for(int i = 0 ; i < board.length; i++){ 
      for(int j = 0 ; j < board[i].length; j++){ 
       boardPW.print(board[i][j]); 
      } 
      boardPW.println(); 
     } 
     boardPW.close(); 
    } 
    catch(Exception e){ 
     e.printStackTrace(); 
    } 

    try{ 
     Scanner scan = new Scanner(boardFile); 
     while(scan.hasNextLine()) { 
      System.out.println(scan.nextLine()); 
     } 
    } 
    catch(Exception e){ 
     e.printStackTrace(); 
    }