I am a real noob with bitcoin and bitcoin. I have a lot of questions and I don't know where to start. Let me try.

I have a bitcoin-qt client and I downloaded the chain (took me one day) and now I am playing with bitcoinj.

• Can I use the block chain downloaded with bitcoin-qt with bitcoinj ? If yes how ?

I created a wallet with bitcoinj client and I get the adress inside it and send money from my bitcoin-qt client to this address.

• Do I need to download the block chain to receive this btc ?

There is this code:

// We want to know when the balance changes.
wallet.addEventListener(new AbstractWalletEventListener() {
    public void onCoinsReceived(Wallet w, Transaction tx, BigInteger prevBalance, BigInteger newBalance) {
        // Running on a peer thread.
    }
}

• Do this code need the block chain ?

Thanks for your answers and the help.