IChair chair = BetterChair. createChair (player, block ) ;
if (chair instanceof BedChair ) {
   BedChair bed = (BedChair )chair ;
    // YOUR STAFF
}
else if (chair instanceof BlockChair ) {
   BlockChair block = (BlockChair )chair ;
    // YOUR STAFF
}
else if (chair instanceof CarpetChair ) {
   CarpetChair carpet = (CarpetChair )chair ;
    // YOUR STAFF
}
else if (chair instanceof SlapChair ) {
   SlapChair slap = (SlapChair )chair ;
    // YOUR STAFF
}
else if (chair instanceof SnowChair ) {
   SnowChair snow = (SnowChair )chair ;
    // YOUR STAFF
}
else if (chair instanceof StairChair ) {
   StairChair stair = (StairChair )chair ;
    // YOUR STAFF
}

@EventHandler
public void onPlayerChairSwitch (PlayerChairSwitchEvent event ) {
    Player player = event. getPlayer ( ) ;
    IChair chair = event. getChair ( ) ;
    boolean enable = event. isEnable ( ) ;
    if (chair instanceof BedChair ) {
        BedChair bed = (BedChair )chair ;
        // YOUR STAFF
    }
    else if (chair instanceof BlockChair ) {
        BlockChair block = (BlockChair )chair ;
        // YOUR STAFF
    }
    else if (chair instanceof CarpetChair ) {
        CarpetChair carpet = (CarpetChair )chair ;
        // YOUR STAFF
    }
    else if (chair instanceof SlapChair ) {
        SlapChair slap = (SlapChair )chair ;
        // YOUR STAFF
    }
    else if (chair instanceof SnowChair ) {
        SnowChair snow = (SnowChair )chair ;
        // YOUR STAFF
    }
    else if (chair instanceof StairChair ) {
        StairChair stair = (StairChair )chair ;
        // YOUR STAFF
    }
}

@EventHandler
public void onPlayerChairCreate (PlayerChairCreateEvent event ) {
    IChair chair = event. getChair ( ) ;
    if (chair. getType ( ) == ChairType. SLAP ) return ;
    event. setCancelled ( true ) ;
    // YOUR STAFF
}
 

@EventHandler
public void onEntityPassengerRotate (EntityPassengerRotateEvent event ) {
    Entity entity = event. getEntity ( ) ;
    EntityType entityType = event. getEntityType ( ) ;
    Location from = event. getOldLocation ( ) ;
    Location to = event. getNewLocation ( ) ;
    // YOUR STAFF
}