Irrlicht Engine

I wanna create my own subclass of ISceneNodeAnimator, but it doesn't work.
for example, I simply create a class A.
class A extends ISceneNodeAnimator {
public A() {
...
}

public void animateNode(ISceneNode node, long timeMs) {
System.out.println("called");
}
}

nothing is ouputed. So I ...

Thank you. Now I understand.

Look the following codes in OctTree
...
OctTree(const core::array<SMeshChunk>& meshes, s32 minimalPolysPerNode=128)
{
nodeCount = 0;

IndexDataCount = meshes.size();

//some problems here
IndexData = new SIndexData[IndexDataCount];

core::array<SIndexChunk>* indexChunks = new core::array ...