Length of a 2D Array

Answer:

int[][] uneven = 
    { { 1, 9, 4 },
      { 0, 2},
      { 0, 1, 2, 3, 4 } };

Which of the following exist?

uneven[ 0 ][ 2 ] OK
uneven[ 1 ][ 1 ] OK
uneven[ 2 ][ 5 ] WRONG
uneven[ 3 ][ 0 ] WRONG

The length of a 2D array is the number of rows it has. You might guess that "length" could be defined as a number pair (rows, columns). But the number of columns may vary from row to row so this will not work. However, the number of rows does not change so it works as a length. Here is an example program:

class UnevenExample2
{
  public static void main( String[] arg )
  {
    // declare and construct a 2D array
    int[][] uneven = 
        { { 1, 9, 4 },
          { 0, 2},
          { 0, 1, 2, 3, 4 } };

    System.out.println("Length is: " + uneven.length );
  }
}

QUESTION 9:

What does the program print out?