java outer while loop is not iterating

Question

I wrote the following code and the inner for loop works fine, but the outer loop does not iterate. Here is my code:

BufferedReader userfeatures = new BufferedReader(new FileReader("userFeatureVectorsTest.csv"));
BufferedReader itemfeatures = new BufferedReader(new FileReader("ItemFeatureVectorsTest.csv"));         

while ((Uline = userfeatures.readLine()) != null) 
{
    for (String Iline = itemfeatures.readLine(); Iline != null; Iline = itemfeatures.readLine()) 
    {           
         System.out.println(intersect(Uline, Iline).size()); 
         System.out.println(union(Uline, Iline).size());  
    }
}
userfeatures.close();
itemfeatures.close();

}

It finds the intersection and union of the first line of the first file with every line of the 2nd file and then it stops. However, I need to continue and repeat the same procedure for next lines of the first file. So, I think there is some problems related to my outer while loop, but I could not find what is the proble :| Could someone help me please? Thanks

Answer 1

itemfeatures has to be initialized just before for loop each time you read from userfeatures. Otherwise your itemfeatures is fully read after first while iteration