Is it possible to contruct array in Java without number of elements?

Question

I have some problem when using array in Java. If I declare an array of character like this, my program will throw exception "out of bound array":

char[] ipx = {};
for( int i =0; i <= 63 ; i++ ){
ipx[i] = myString.charAt(i);
}

I do not know why it is ok when i replace the first line by:

char[] ipx = new char[64];

I think both of them are correct because i used to delare new string like this:

String newString = "";

what's the difference between those ? Many thanks for any help you may be able to provide

Answer 1

I do not know why it is ok when i replace the first line by:

Because char[] ipx = {}; is equivalent to char[] ipx = new char[0]; // zero sized array;
and in latter case char[] ipx = new char[64]; you allocate 64 chars for your array.