Question

如何在同一个数组中连接两列？

示例：

AA AB AC AD

1  0  2  0

2  1  3  3

3  3  0  2

0  2  1  1

输出：应该是这样的。

AAAB AAAC  AAAD  ABAC  ABAD  ACAD

10   12     10    02    00    20

21   23     23    13    13    33

33   30     32    30    32    02

02   01     01    21    21    11

我如何在java中编写代码？

for（int i = 0; i＆lt; row.size（）; i ++）{

for（int j = 0; j＆lt; col.size（）; j ++）{

for（int k = j + 1; k＆lt; col.size（）; k ++）{

col1.add（VAL [J]）;

col2.add（VAL [K]）;

finalval.add（col1.get（j）+ col2.get（k））;

}

的System.out.println（ “finalval”）;

}

Answer 1

public static void main(String[] args) {
    String[][] elements = new String[][] {
            { "AA",  "AB",  "AC",  "AD" },
            { "1",  "0", "2", "0" },
            { "2",  "1",  "3",  "3" },
            { "3", "3", "0", "2" },
            { "0", "2", "1", "1" }
    };

    for (int row = 0; row < elements.length; row++) {
        for (int col = 0; col < elements[0].length; col++) {
            for (int x = col + 1; x < elements[0].length; x++) {
                System.out.print(elements[row][col] + elements[row][x] + " ");
            }
        }
        System.out.println();
    }
}

输出：

AAAB AAAC AAAD ABAC ABAD ACAD 
10 12 10 02 00 20 
21 23 23 13 13 33 
33 30 32 30 32 02 
02 01 01 21 21 11

Answer 2

public static void main(String[] args) {

    String[][] input = new String[][] { { "AA", "AB", "AC", "AD" },
               { "1", "0", "2", "0" },
               { "2", "1", "3", "3" }, 
               { "3", "3", "0", "2" }, 
               { "0", "2", "1", "1" } };
    String[][] output = new String[input.length][];
    for (int i = 0; i < output.length; i++)
        output[i] = concat(input[i]);
    print(output);

}

private static String[] concat(String[] strings) {
    int n = strings.length;
    String[] result = new String[(n * (n - 1)) / 2];
    int m = 0;
    for (int i = 0; i < n; i++)
        for (int j = i + 1; j < n; j++)
            if (i != j)
                result[m++] = strings[i] + strings[j];
    return result;
}

private static void print(String[][] strings) {
    for (int i = 0; i < strings.length; i++)
        System.out.println(Arrays.asList(strings[i]));
}

如何连接同一个数组中的两列？

2 个答案: