Answer 1

public class Testclass {

public static void main(String[] args) {
String line = "1,2,3,4,5,6\n" + "1,3,5,7,9\n";
String[] singleArray = line.split("\n");
String[][] stringMultiArray = new String[singleArray.length][];
for (int i = 0; i < stringMultiArray.length; i++) {
stringMultiArray[i] = singleArray[i].split(",");
}

// converting multidimensional String Array into multidimensional int Array
int[][] intMultiArray = new int[stringMultiArray.length][];
for (int i = 0; i < intMultiArray.length; i++) {
int[] toAdd = new int[stringMultiArray[i].length];
for (int j = 0; j < stringMultiArray[i].length; j++) {
toAdd[j] = Integer.valueOf(stringMultiArray[i][j]);
}
intMultiArray[i] = toAdd;
}
}
}