Converting Integer to int - Junit

Question

Hello
I have a problem with a Junit test case. The search function did not return any helpful results, so I'm trying my luck here.
I'm using Junit 4.4 and JDK1.6.0_01
My class which I would like to test looks like this:
public class SortedIntArrayList<Integer> extends ArrayList<Integer> {
     public SortedIntArrayList(){
          super();
    /* adds an integer val such that the list is
       always sorted in ascending order
     public void addInt(Integer val){
     // @TODO implementation will follow
}and this is my test class
public class SortedIntArrayListTest extends TestCase {
     private SortedIntArrayList<Integer> saExp = new SortedIntArrayList<Integer>();
     private SortedIntArrayList<Integer> saAct = new SortedIntArrayList<Integer>();
     @Override
        public void setUp(){
          // set up the actual sortedIntArrayList
          saAct.add(-6);
          saAct.add(2);
          saAct.add(9);
          saAct.add(22);
          saAct.add(69);
          // set up the expected sortedIntArrayList
          saExp.add(-6);
          saExp.add(2);
          saExp.add(9);
          saExp.add(22);
          saExp.add(69);
     // add an element at the beginning of the arraylist
     public void testAddIntFirstElement(){
          int val = -10;
          this.saAct.add(0,val);
          this.saExp.addInt(new Integer(val));
          assertEquals(saAct,saExp);
}Now to my problem.
I'm trying to create a method addInt(Integer) in my SortedIntArrayList class, such that the resulting arrayList will be ordered.
In my addInt(Integer val) method I want to get the int value from the val Integer object to compare it to the values already in the arrayList.
What I tried to do:
public void addInt(Integer val){
     if(this.get(0).intValue()<val.intValue()){
         // do something
}Does not work! Also, Integer.parseInt and all these Integer methods do not show up.
When I open a new project and try something like
public static void main(String[] args) {
   int i;
   Integer itgr = new Integer(10);
   i = itgr.intValue();
}it does work.
What am I doing wrong? By the way, I tried it in Eclipse as well as in NetBeans.
Thanks for your help
Greetings, David
Edit: Well, after some research I found out that my actual problem is that I cannot Instantiate Integer in my extended class like:
Integer i = new Integer(30);
message: cannot instantiate integer.
Any ideas why that is?
Edited by: strad on Nov 9, 2007 8:43 AM

Answer 1

It sounds like you've defined a class and named it .... Integer! So the compiler thinks "Integer" is your class and not java.lang.Integer.
Solution: rename or get rid of your Integer class, or be forced to write this everywhere:
java.lang.Integer x = new java.lang.Integer(42);