Cant change window Icon in a JFrame

Question

I cannot seem to set the icon in the upper left of the window or in the task. I am using NetBeans and it created my JFrame for me using the following code to initialize:
java.awt.EventQueue.invokeLater(new Unable() {
            public void run() {
                new MainFrame().setVisible(true);
        });I have checked online tutorials and this seem to be a trully easy task BUT my JFrame, MainFrame, seems not to have the method I need....
I should be able too do this:
MainFrame.setIconImage(Image image); But it seems I cannot get that method in my JFrame at all, it just doesnt show up in NetBeans and wont allow me to compile. I have tried looking at the base JFrame class and see no setIconImage there either. Any help would be apriciated.
KN

Answer 1

Can you post the code for your MainFrame class. Use
code tags.Ok, 1st excuse the messy code, I am teaching myself Java and the code is a bit unproffesional. Also the code is large as it is a calendar program that allows you to input text into the actual calendar day boxes, loads, saves etc. Here is the declaration of the MainFrame class and the MainFrame constructor.
public class MainFrame extends javax.swing.JFrame {
    // Constants
    public final int DATE_HEIGHT = 17;
    public final int DAY_HEIGHT = 80;
    public final boolean DBG = true;
    public boolean Init = true;
    public int curMonth = 0;
    public int curYear = 0;
    /** Creates new form MainFrame */
    public MainFrame() {
        initComponents();
        for(int x = 0;x < 12;x = x + 2){
            jTable1.setRowHeight(x,DATE_HEIGHT);
            jTable1.setRowHeight(x+1,DAY_HEIGHT);
        jTable1.setDefaultRenderer(Object.class, new ColorCellRenderer());
        DateFormat dateFormat =
                DateFormat.getDateInstance(DateFormat.FULL);
        // Create our Gregorian Calendar.
        GregorianCalendar cal = new GregorianCalendar();
        cal.setTime(new Date());
        DaYear.setYear(cal.get(cal.YEAR));
        DaMonth.setMonth(cal.get(cal.MONTH));
        Init = false;
        LoadIt(curMonth, curYear);
    }KN