Two dimensional array list

Question

I\'ve heard of using a two dimensional array like this :

String[][] strArr;

But is there any way of doing this with a list?

Maybe s

Answer 1

Infact, 2 dimensional array is the list of list of X, where X is one of your data structures from typical ones to user-defined ones. As the following snapshot code, I added row by row into an array triangle. To create each row, I used the method add to add elements manually or the method asList to create a list from a band of data.

package algorithms;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class RunDemo {

/**
 * @param args
 */
public static void main(String[] args) {
    // Get n
    List> triangle = new ArrayList>();

    List row1 = new ArrayList(1);
    row1.add(2);
    triangle.add(row1);

    List row2 = new ArrayList(2);
    row2.add(3);row2.add(4);
    triangle.add(row2);

    triangle.add(Arrays.asList(6,5,7));
    triangle.add(Arrays.asList(4,1,8,3));

    System.out.println("Size = "+ triangle.size());
    for (int i=0; i

Running the sample, it generates the output:

Size = 4
[2]
[3, 4]
[6, 5, 7]
[4, 1, 8, 3]