Question

This is part of my code.

Integer keyLocation = reducedFD.indexOf(KeyPlus.get(KEYindex));
someArrayList.remove(keyLocation);

So what I am doing here is I assign keyLocation(the first occurence of a string in the reducedFD arrayList). But when I want to remove from someArrayList the item with that keyLocation, it will not work.

If I input manually:

someArrayList.remove(0); //Let's say 0 is the actual keyLocation

This actually works.

What is weird is THAT THE FOLLOWING CODE ALSO WORKS:

someArrayList.remove(keyLocation + 1);

Any hints?

Here is the main loop:

for (int KEYindex = 0; KEYindex < KeyPlus.size(); KEYindex++){

 Integer keyLocation = reducedFD.indexOf(KeyPlus.get(KEYindex));

if (reducedFD.contains(KeyPlus.get(KEYindex))){

 KeyPlus.add(reducedFD.get(keyLocation+1));
 CheckedAttributesPlus.add(KeyPlus.get(KEYindex));
 reducedFD.remove(keyLocation);

}
}

Answer 1

The problem is you are passing an Integer to the remove method, and not an int. When you pass an Integer, it assumes that the Integer itself is what you are trying to remove, not the value at that index. Compare the methods

remove(Object o)
remove(int i)

so do:

int keyLocation = reducedFD.indexOf(KeyPlus.get(KEYindex));
someArrayList.remove(keyLocation);