public void onPaint(Graphics g) {
    g.setColor(Color.RED);
    Trade t = new Trade(this);
    if (t.isOpen()) {
        TradeItem[] all = t.getMyTradeInv();
        for (TradeItem one : all) {
        g.drawRect(one.rect.x, one.rect.y, one.rect.width,
            one.rect.height);
        }
        all = t.getOtherTradeInv();
        for (TradeItem one : all) {
        g.drawRect(one.rect.x, one.rect.y, one.rect.width,
            one.rect.height);
        }
    }
    }