int[][]intMyArr = new int[2][]; 
   intMyArr[0] = new int[4]{6, 1, 4, 3}; 
   intMyArr[1] = new int[3]{9, 2, 7};
  intMyArr is a reference to a 2-D jagged array.
  The two rows of the jagged array intMyArr are stored in adjacent memory locations.
  intMyArr[0] refers to the zeroth 1-D array and intMyArr[1] refers to the first 1-D array.
  intMyArr refers to intMyArr[0] and intMyArr[1].
  intMyArr refers to intMyArr[1] and intMyArr[2].