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  1. #1
    nat45928 is offline Member
    Join Date
    Apr 2011
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    Default Passing JLabels between classes


    I'm trying to have multiple classes to complete a goal. I need multiple classes to access one JLabel and update it using the .setText() function. I have a variables class that just holds variables. this is its code:

    Java Code:
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    import javax.swing.Timer;
    public class variables {
    	public static String bUrl;
    	public static String username;
    	public static String votingip;
    	public static int vote_count;
    	public JFrame frame = new JFrame();
        public JLabel label = new JLabel ();
        public JLabel userlabel= new JLabel ();
        public JLabel iplabel = new JLabel ();
        public JLabel timerheadinglabel = new JLabel ();
        public JLabel votecountlabel = new JLabel ();
        public JLabel lastvoteinfolabel = new JLabel ();
        public JLabel totaltallylabel = new JLabel ();
        public JPanel panel = new JPanel();
    Now I have a class that accesses these to apply values and attributes as normal and it displays the JFrame.

    Java Code:
    import javax.swing.JFrame;
    import back_end.variables;
    public class label_set {
    	variables call_vars = new variables();
    	public void addMainResultsWindow(){
    		call_vars.frame.setSize(480, 250);
    	    call_vars.timerheadinglabel.setText("Time till next vote:");
    	    call_vars.lastvoteinfolabel.setText("Last Vote Info");
    	    call_vars.totaltallylabel.setText("Total Tally");
    	    call_vars.timerheadinglabel.setBounds(175, 47, 150, 14);
    	    call_vars.label.setBounds(214, 70, 60, 14);
    	    call_vars.iplabel.setBounds(90, 125, 150, 14);
    	    call_vars.userlabel.setBounds(90, 150, 120, 14);
    	    call_vars.votecountlabel.setBounds(250, 125, 100, 20);
    	    call_vars.lastvoteinfolabel.setBounds(95, 100, 100, 14);
    	    call_vars.totaltallylabel.setBounds(250, 100, 100, 14);
    	    //this item echos out the first line in the console
    Then once this is done i try and have the main class that runs this all print the call_vars.userlabel variable, the iteresting this is its not the same as the call in the label_set class. so that class is not updating the variable in the variiables class like i want it too. here is the main calss that excutes this:

    Java Code:
    import back_end.variables;
    import GUI_components.label_set;
    public class start_gui_bot {
    	variables call_vars = new variables();
    	public void startGuiBot (String url) throws Exception {
    		variables.bUrl = url;
    		call_vars.timeRemaining = variables.timertime;
    public static void main(String[] args) throws Exception {
    	start_gui_bot vb = new start_gui_bot ();
    	label_set ls = new label_set();
    	variables call_vars = new variables();
                    //this is the se3cond output in the console
    and this all out puts:

    javax.swing.JLabel[,90,150,120x14,invalid,alignmentX=0.0,alignmentY=0 .0,border=,flags=8388608,maximumSize=,minimumSize= ,preferredSize=,defaultIcon=,disabledIcon=,horizon talAlignment=LEADING,horizontalTextPosition=TRAILI NG,iconTextGap=4,labelFor=,text=Waiting,verticalAl ignment=CENTER,verticalTextPosition=CENTER]
    javax.swing.JLabel[,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.0,bor der=,flags=8388608,maximumSize=,minimumSize=,prefe rredSize=,defaultIcon=,disabledIcon=,horizontalAli gnment=LEADING,horizontalTextPosition=TRAILING,ico nTextGap=4,labelFor=,text=,verticalAlignment=CENTE R,verticalTextPosition=CENTER]

    in the console when the main class runs. So my question is how can i get the addMainResultsWindow(); method to change the variables in the class?

  2. #2
    Fubarable's Avatar
    Fubarable is offline Moderator
    Join Date
    Jun 2008
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    Your "out puts" is simply the toString() representation of a JLabel, and should be the expected output given your trying to call println on a JLabel rather than its text.

    More importantly, your design is very un-OOPish and is liable to break. I urge you to study a book on OOP (it doesn't have to be OOP as it applies to Java, but that would help too) before trying to create complex Java GUI's.

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