Referencing an Entity?

I am writing code that I don't find efficient at all. I want to make a class in which I reference a couple things and just do it there, so I won't have to write it again and again for each entity.

Code:

@EventHandler
    public void onDamageEntity(PlayerInteractEntityEvent e) {
            if (e.getRightClicked() instanceof Cow) {
                onDamageEntity();
            }
 
// Deal with it here
private void onDamageEntity(Entity e) {
    e.damage(int);
}

Is this possible?

 

This should work:

Code:

@EventHandler
public void onDamageEntity(PlayerInteractEntityEvent e) {
    if (e.getRightClicked() instanceof Cow) {
        Cow cow = (Cow) e.getRightClicked();
        onDamageEntity(cow);
    }
}
 
private void onDamageEntity(Entity e) {
    if (e instanceof LivingEntity) {
        ((LivingEntity) e).damage(double);
    }
}