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POHow to get acces to elements from another GUi?
 

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  1. POHow to get acces to elements from another GUi?
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    <p>First I have a GUI (gui1), when I press a button, a different GUI (gui2) is created. My question is: How I can get access to elements from gui2, using methods from gui1?</p> <p>Example: When I press a button from gui1, I want to <code>QuesHandText.setText(myVector[0]);</code> <code>QuesHandText</code> is a <code>JTextField</code> from gui1 and <code>myVector[0]</code> a var from gui2. The result error message: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException</p> <p>When I press Ok from Gui2 , I want to setText for the JTextField on Gui1 <a href="http://img72.imageshack.us/img72/2822/36185233.png" rel="nofollow">http://img72.imageshack.us/img72/2822/36185233.png</a></p> <pre><code> //imports public class Gui extends JFrame{ public JButton Simulate, Particular, Start, HandSelection; public JTextField QuesHandText, FlopTurnRiverText, RezultatText; public Gui g; public Gui() { QuesHandText = new JTextField(4); //instruct ClassParticular handler1 = new ClassParticular(); Particular.addActionListener(handler1); } public Gui(String t) { //instruct myVector[0]="some_string"; myVector[1]="some_string2"; } public class ClassParticular implements ActionListener{ public void actionPerformed(ActionEvent event){ //instruc HandSelection hs = new HandSelection(); HandSelection.addActionListener(hs); StartClass hndlr = new StartClass(); Start.addActionListener(hndlr); add(HandSelection); add(Start); } } public class HandSelection implements ActionListener{ public void actionPerformed(ActionEvent e){ g = new Gui("Hand selection"); g.setVisible(true); g.setSize(1135,535); g.setDefaultCloseOperation(HIDE_ON_CLOSE); g.setResizable(false); } } public class StartClass implements ActionListener{ public void actionPerformed(ActionEvent event){ QuesHandText.setText(myVector[0]); // THE PROBLEM IS HERE, I KNOW IT !! } } </code></pre> <p>}</p>
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    1. COFor pities sake. This question boils down to the [basic OO](http://docs.oracle.com/javase/tutorial/java/javaOO/index.html) section of the Java Tutorial. Note that is explained as the 3rd part in the Learning the Java Language trail. That trail happens to be before it gets to GUIs. So go back to the tutorial, and do the groundwork.
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      1. USAndrew Thompson
    2. CODid you initialize QuesHandText anywhere? You need to assign a JTextField object to QuesHandText before you can call any methods on QuesHandText. As of now, unless you initialize QuesHandText elsewhere it is just a null reference.
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      1. USAlderath
    3. CO@Alderath , yes I did .
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