java - How to concatinate two columns in same array? -

how concatinate 2 columns in same array?

example:

aa ab ac ad  1  0  2  0  2  1  3  3  3  3  0  2  0  2  1  1 

output:should this.

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 

how can code in java ?

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

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

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

col1.add(val[j]);

col2.add(val[k]);

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

}

}

system.out.println("finalval");

}

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][];     (int = 0; < 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;     (int = 0; < n; i++)         (int j = + 1; j < n; j++)             if (i != j)                 result[m++] = strings[i] + strings[j];     return result; }  private static void print(string[][] strings) {     (int = 0; < strings.length; i++)         system.out.println(arrays.aslist(strings[i])); }