I’m not sure that I quite understand your question — are you wishing to create a two dimensional array? If so, then it depends whether or not you are wishing to create an array of Objects or of primitives:
// declares a 5×5 arrays of int and each element is set to 0
public int intArray;
// declare a 5×5 array of Strings; each element then needs
// to be set
public String stringArray;
Of course, the above is assuming you want a rectangular array, if you want to have an array where each row can be different lengths, you go about it differently.
Can you give explain your question in more detail?