java - 在Java中打印数组时跳过一些字符

Question

我正在使用下面的方法使用数组打印游戏的 map 。当我打印数组时，如何隐藏一些字符(它们没有特定的模式，因为它们是由计算机随机猜测的)？:

public static void print2D(char[][] ocean_map) {
        int j = 0;
        System.out.print("  ");
        for(int i = 0; i < ocean_map.length; i++){
            System.out.print(" " + i + " ");
        }
        System.out.println();
        for (char[] row : ocean_map) {
                System.out.println(j + "|" + Arrays.toString(row) + "|" + j);
                j++;
        }
        System.out.print("  ");
        for(int i = 0; i < ocean_map.length; i++) {
            System.out.print(" " + i + " ");
        }
        System.out.println();
    }

Answer 1

您可以编写一个方法来代替Arrays.toString(row)来处理这个问题。例如

String rowAsString(char[] row) {
    // this is the list of characters you want to show
    List<Character> whitelist = Arrays.asList('a', 'b', 'c');
    StringBuilder sb = new StringBuilder();
    for (char ch : row) {
        final String toAdd;
        if (whitelist.contains(ch)) {
            toAdd = ch;
        } else {
            toAdd = ' ';
        }
        sb.append(toAdd);
    }
    return sb.toString();
}