Error: Generic Error Creation

Question

Hi All,
Following in the line which is giving error "Generic Error Creation" on compile:
Line:
public static Queue<String>[] mqPrcLst = new LinkedList<String>[BankerAndFifo.miNoOfPrc];
Result:
FIFO.java:12: generic array creation
public static Queue<String>[] mqPrcLst = new LinkedList<String>[BankerAndFifo.miNoOfPrc];
Here is what I am trying to do:
Create an array of Queue objects where each process will have its own queue containing a set of instructions pertaining to that process.
I am a novice in this field[Collections].
Kindly guide me.
Regards,
java_learner_s

Answer 1

jverd wrote:
java_learner_s wrote:
@jverd
What would you have me do? Either use a List instead of an array, or don't use generics here. Those are your only real options.Or fake it:
   public static void main(String[] args) {
      List<String>[] x = createGenericArray(10);
      x[0] = new LinkedList<String>();
   @SuppressWarnings("unchecked")
   public static <T> T[] createGenericArray(int length) {
      return (T[]) new Object[length];
   }Use at your own risk (though, to be honest, I don't see anything unsafe about it. Except the ClassCastException...give me a sec to fix).
Edit Here we go.
   public static void main(String[] args) {
      List<String>[] x = createGenericArray(List.class, 10);
      x[0] = new LinkedList<String>();
      x[1] = new ArrayList<String>();
//      x[2] = new LinkedList<Integer>(); // doesn't compile
   @SuppressWarnings("unchecked")
   public static <U, T extends U> T[] createGenericArray(Class<U> type, int length) {
      return (T[]) Array.newInstance(type, length);
   }I don't like it and would probably never use it, but is it unsafe?
Edited by: endasil on 12-Nov-2009 2:28 PM