About Question enthuware.ocajp.i.v7.2.1387 :

[gparLondon]

Size of the dimensions is required to specified only at the time of instantiation and not at the time of declaration. For example, int[][] ia; //this is a valid declaration. int[][] ia = new int[2][3];//this is a valid declaration and a valid instantiation.

Just a little suggestion in the example also int[][] ia=new int[3][] is also valid,

as the choice 3, sasy

The number of rows and columns must be specified at the time it is declared.

Thanks,
GPAR

[admin]

Added.
thank you for your feedback!

[pbonito]

It seems that only the first dimension should be decalred in multidimensional array:
int [] [][]arr = new int[2][][];

but in choice 3 I read:
the last dimension can also be left out at the time of instantiation for an array of more than one dimension.

Thanks

[admin]

You are right the explanation is incorrect. Fixed.
thank you for your feedback.
Paul.