Question

This is my class:

private class Node {
    public int[] pivot;
    public int pivotIndex;
}

I get warning in Eclipse that pivotIndex is not used, but
that is not true, it is used later in the code in the same file.
Is this a bug in Eclipse?

Answer 1

Just the fact that your variable is mentioned elsewhere doesn’t mean it is used. To demonstrate:

public class Test {
  public void x() {
    Node n = new Node();
    n.pivot = null;
    n.pivotIndex = 0;
  }
  private class Node {
    public int[] pivot;
    public int pivotIndex;
  }
}

Now both pivot and pivotIndex are marked as unused, and quite justified: the program never needs their value.