Question

我想从我的程序中打印出2d字符串数组中字符数最多的列的索引

public static int columns(String [][] matrix) {
    int numCol = matrix[0].length;
    int indexCol = -1;
    for(int col = 0; col < numCol; col++) {
        int count = 0;
        int countEach = 0;
        for(String[] row : matrix) {
            count += row[col].length();
            if(count > countEach){
                countEach = count;
            }

            System.out.println("count one by one (rows) : " + countEach +" "+"Column :" + col);
        }
        System.out.println();
        System.out.println("SumChar : " + count +" " + "column : "+col + "###############");
    }
    System.out.println("Index of the highest array of characters by columns : ");
    return indexCol;
}

到目前为止，我的代码看起来像这样，但我仍然坚持如何比较我的结果，有人可以帮我解释一下如何继续吗？非常感谢你！

Answer 1

问题出在您的if子句和变量countEach的位置。 countEach将在外循环的每次迭代中设置为0，使得if子句始终为真，因此无效工作。你想要的是使用countEach作为变量来保存某些列所具有的最大字符总和的值。这样，您就可以将if子句传递给外部循环，并向其添加具有更多字符的列索引的更新。

检查下面的修改：

完整代码

public static int columns(String [][] matrix) {
    int numCol = matrix[0].length;
    int indexCol = -1;
    int countEach = 0; // Put countEach outside the for loop

    for(int col = 0; col < numCol; col++) {
        int count = 0;

        for(String[] row : matrix) {
            count += row[col].length();

            System.out.println("count one by one (rows) : " + count +" "+"Column :" + col);
        }

        // Move if clause to here
        if(count > countEach){
            countEach = count;
            indexCol = col; // Update column index with more chars
        }

        System.out.println("SumChar : " + count +" " + "column : "+col + "###############");
        System.out.println();
    }

    System.out.println("Index of the highest array of characters by columns : ");
    return indexCol;
}

比较字符串

1 个答案: