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Thread: set frame title from another class

  1. #1
    Junior Member
    Join Date
    Aug 2013
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    Default set frame title from another class

    I have a frame which has tabs (code is below)--
    private JPanel mainPane;
    	private JFrame fr;	
    		public TabClass(){
                            super("change this title");
    			fr=new JFrame();
    			mainPane=new JPanel();
    			JTabbedPane jtp=new JTabbedPane();
    			jtp.addTab("General",  new General());
    			jtp.addTab("Options", new Options());
    			setSize(600, 600);
    	public static void main(String[] args) {
    		TabClass jp=new TabClass();		
    In the Option class (given above when adding tabs) I have a textfield where user will enter text and that text will be set as title of window.
    I did not get how to set title of frame from another class. The code of Option class is as below
    public void actionPerformed(ActionEvent e){
    				String getCompanyName=txtName.getText();	
    				TabClass tb=new TabClass();
    When I run above code a new widow is created and its title is set as text entered by user. Please tell me how to set frame title from another class? Any suggestion will also be appreciated.

  2. #2
    Super Moderator jps's Avatar
    Join Date
    Jul 2012
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    Thanked 263 Times in 232 Posts

    Default Re: set frame title from another class

    To change the state of any object from an outside class, you either need to make the field public or provide a method to access/change it.
    Considering JFrame's setTitle(String title), (inherited from Frame), you pass a string as the new title.
    Making fr public would allow fr.setTitle(title); to work.
    On the other hand the TabClass could have a method setTitle(String title); where inside the body you use the fr.setTitle(title); and keep fr private.
    (Using the method and keeping the field private would be my recommendation)

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