Clipboard

class ClipboardListener extends Thread implements ClipboardOwner {

    Clipboard sysClip = Toolkit.getDefaultToolkit().getSystemClipboard();
    boolean bEnough = false;

    @Override
    public void run() {
        Transferable trans = sysClip.getContents(this);
        regainOwnership(trans);
        while (true) {
            if (isitEnough()) {
                break;
            }
        }
    }

    public void itisEnough() {
        bEnough = true;
    }

    public void itisNotEnough() {
        bEnough = false;
    }

    boolean isitEnough() {
        return bEnough;
    }

    @Override
    public void lostOwnership(Clipboard c, Transferable t) {
        try {
            sleep(200);
        } catch (Exception e) {
            System.out.println("Exception: " + e);
        }
        try {
            Transferable contents = c.getContents(this);
            regainOwnership(contents);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    void processContents(Transferable t) {
        if (isitEnough()) {
            return;
        }
        DataFlavor[] flavors = t.getTransferDataFlavors();
        for (int i = flavors.length - 1; i >= 0; i--) {
            try {
                Object o = t.getTransferData(flavors[i]);
                if (o instanceof String) {

                    System.out.println(o.toString().toLowerCase());

                    break;
                }
            } catch (UnsupportedFlavorException | IOException exp) {
                exp.printStackTrace();
            }
        }
    }

    void regainOwnership(Transferable t) {
        sysClip.setContents(t, this);
        processContents(t);
    }

    public static void main(String[] args) {
        ClipboardListener b = new ClipboardListener();
        b.itisNotEnough();
        b.start();
    }
}