separate thread to change label icon

Question

I want to use a separate thread for changing a label's icon every 2 seconds.The icons (pictures actually, reclama1, reclama2, etc) are stored in the project's folder called "poze". So when i try the code below, I receive the following error every 2 seconds. What am I doing wrong?

error:

java.lang.RuntimeException: Uncompilable source code - Erroneous tree type:<any>

code:

public GUI() {
    initComponents();
    JTable.setModel(m);     
    JTable.setRowSorter(sorter);
    bFiltru.setVisible(false);
    bFiltru.setText("Afiseaza intreaga lista");

    TimerTask task = new TimerTask(){
    public void run(){
    for (int i=1; i<5, i++){
    ImageIcon iconLogo = new ImageIcon("poze/reclama"+i+".gif");
    jLabelReclama.setIcon(iconLogo);
    if (i == 4) i = 0;
    }
    }
}
    Timer t = new Timer();
    t.schedule(task, 0, 2000);
}

Answer 1

1. Use a Swing Timer not a java.util.Timer as that's what it's for -- to give you timer functionality but on the Swing event thread.
2. Your code, even if it worked would not do anything near what you desire as your for loop would loop immediately.
3. You shouldn't be using a for loop at all. The Timer provides your looping functionality. Increment a counter in the timer and use its value to get the next icon. Set the counter to 0 when it reaches the size of the collection.
4. What line causes your error, because it has nothing to do with the problem you describe.