我怎樣才能讓（不refernce）二維字符串的副本？

我練習使遊戲戰艦。我在這裏爲玩家制作了遊戲網格，並試圖爲電腦玩家複製網格。然而，當我改變AI的網格時，它會改變玩家的網格。我讀到這是因爲它們是一起引用的，而不是單個副本。我怎樣才能讓（不refernce）二維字符串的副本？

static String[] Row1 = new String[] {" ", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10"}; 
    static String[] Row2 = new String[] {"A", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"}; 
    static String[] Row3 = new String[] {"B", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"}; 
    static String[] Row4 = new String[] {"C", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"}; 
    static String[] Row5 = new String[] {"D", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"}; 
    static String[] Row6 = new String[] {"E", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"}; 
    static String[] Row7 = new String[] {"F", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"}; 
    static String[] Row8 = new String[] {"G", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"}; 
    static String[] Row9 = new String[] {"H", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"}; 
    static String[] Row10 = new String[] {"I", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"}; 
    static String[] Row11 = new String[] {"J", "-", "-", "-", "-", "-", "-", "-", "-", "-", "-"}; 

    static String[][] playerGrid = {Row1,Row2,Row3,Row4,Row5,Row6,Row7,Row8,Row9,Row10,Row11}; 

    static String[][] aiGrid = playerGrid;

我讀了關於使用clone（），但我不知道代碼中的位置。

我也試過

static String[][] aiGrid = new String[][](playerGrid.getText());

，但我得到一個錯誤，說明我是想一個String []存儲到一個String [] []

有什麼建議？

來源

2016-01-03 Bill

的可能的複製[複製在Java 2D陣列（http://stackoverflow.com/questions/1686425/copy-a-2d-array-in-java） – resueman

-1

這將做到這一點：

static String[][] aiGrid = playerGrid.clone();

在這裏，您使用對象的方法克隆來克隆String[][] playerGrid。這將複製變量playerGrid到aiGrid

來源

2016-01-03 20:46:22 Extremelyd1

感謝您的信息。我用這個，並編譯了代碼，但是當我更改aiGrid時，它也改變了playerGrid。 – Bill

這只是一個淺拷貝，並沒有複製的各個排的陣列。 –

嘗試Arrays.copyOf(...)在一個循環內：

https://docs.oracle.com/javase/7/docs/api/java/util/Arrays.html

實施例：

String[][] source = {{"a","b","c"},{"d","e","f"},{"g","h","i"}}; 
    String[][] copy = new String[source.length][]; 
    for(int i = 0 ; i < source.length ; i++) { 
     copy[i] = Arrays.copyOf(source[i],source[i].length); 
    }

的clone()克隆包圍陣列，而不是內部陣列。例如：

String[][] source = {{"a","b","c"},{"d","e","f"},{"g","h","i"}}; 
    String[][] copy = source.clone(); 
    boolean areTheSame = true; 
    for(int i = 0 ; i < source.length ; i++) { 
     areTheSame = areTheSame && (source[i] == copy[i]); 
    } 
    System.out.println("areTheSame = " + areTheSame);

輸出爲areTheSame = true

來源

2016-01-03 20:59:56 Mario

克隆只會複製的第一個維度。

你可以試試這個：

static String[][] playerGrid = {Row1.clone,Row2.clone,Row3.clone,Row4.clone,Row5.clone,Row6.clone,Row7.clone,Row8.clone,Row9.clone,Row10.clone,Row11.clone};

來源

2016-01-03 21:29:46

我會去建立兩個數組的方式是，通過使它們都通過一個方法來初始化網格。

public String[][] playerGrid; 
public String[][] aiGrid; 

public static void main(String[] args){ 

    initBoard(playerBoard); 
    initBoard(aiBoard); 

} 

public static void initBoard(String[][] board){ 

    String[] digits=new String[]{"1","2","3","4","5","6","7","8","9","10"}; 
    String[] chars=new String[]{"A","B","C","D","E","F","G","H","I","J"}; 
    board = new String[11][11]; 
    for(int y=0;y<11;y++){ 
     for(int x=0;x<11;x++){ 
      if(x == 0 && y == 0){ 
       board[y][x] = " "; 
      } else if(x == 0){ 
       board[y][x] = chars[y-1]; 
      } else if(y == 0){ 
       board[y][x] = digits[x-1]; 
      } else { 
       board[y][x] = "-"; 
      } 
     } 
    } 
}

如果您添加重新啓動遊戲的能力，您也可以稍後使用此方法。只需再次通過網格通過該方法，他們會像新的一樣好。

來源

2016-01-03 21:33:18 JereTheJuggler

我怎樣才能讓（不refernce）二維字符串的副本？

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