Regarding basic Java

Question

hello!!!!!!!!!!!!!!
i have a doubt .if u pls clarify it
the problem is when i want to initialise the elements of array in the class , i get error message
like this------------------------------
public class Dataman {
String[] aa= new String[10];
aa[0] = "bb";
but if i want to initialise in constructor no error messge is shown
public class Dataman {
public Dataman(){
String[] aa= new String[10];
aa[0] = new String("qq");
why it is so????????????????

Answer 1

The initializer allowed at the declaration of a variable is limited to a simple single assignment. If you need to do any fancier stuff, you need to put that into a code block. The appropriate place for such code is the constructor.
Initializing an array is also possible by an initializer. You, however, have to choose between specifying the length of the array explicitly, in which case the whole array is nulled, or an initializer, which implicitly specifies the length of the array:
String[]  s1 = { "ab", "cd", "ef" };   // an array of size 3, initialized with the provided values; syntax restricted to initializers
String[]  s2 = new String[] { "ab", "cd", "ef" };   // dito, but syntax also good in ordinary code
String[]  s3 = new String[7];                           // an array of size 7, initialized with nulls; good for initializers and ordinary code