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POHow do I close a single frame in Java?
 

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  1. POHow do I close a single frame in Java?
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    <p>So, I have a frame(awt) with a button, and if you click "Sync" it makes a popup. Right now, I simply want it so you can click the X on that popup, and the popup will go away. I have a comment showing where I want it to go away.</p> <pre><code>import java.awt.*; import java.awt.event.*; public class Main { public static void main(String[] args) { ActionListener listen=new MyActionListener(); Frame frame= new Frame("frame");//make the frame Button exit=new Button("Exit"); exit.setActionCommand("Exit"); exit.addActionListener(listen); Button Sync=new Button("Sync"); Sync.setActionCommand("Sync"); Sync.addActionListener(listen);//create Exit and Sync buttons. frame.add(exit); frame.add(Sync); frame.setLayout(new GridLayout(2, 1)); frame.setSize(100,80); frame.setVisible(true); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); } public void MyActionListener(ActionEvent e) { System.exit(0); } } class MyActionListener implements ActionListener{ public void actionPerformed(ActionEvent ae) { String s = ae.getActionCommand(); if (s.equals("Exit")) { System.exit(0); }//note that the exit button DOES work, so this system is working. if (s.equals("Sync")) { Frame frame2= new Frame("Popup!"); frame2.setVisible(true); frame2.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { //Remove frame2 here. } }); } } } </code></pre> <p>I saw a very similar (if not the same) question asked before, and the "answer" was to use dispose. ("frame2.dispose();") I tried that, and i got the following error report:</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Uncompilable source code - local variable frame2 is accessed from within inner class; needs to be declared final at vexscouting.MyActionListener$1.windowClosing(Main.java:76) at java.awt.Window.processWindowEvent(Window.java:1865) at java.awt.Window.processEvent(Window.java:1823) at java.awt.Component.dispatchEventImpl(Component.java:4630) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Window.dispatchEventImpl(Window.java:2478) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) </code></pre> <p>Note: I'm using NetBeans</p>
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      1. POHow do I close a single frame in Java?
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    1. COYou're trying to run uncompilable code -- never do that. First fix the compilation issues, then and only then run the code. Either make frame2 variable final or make it a class field. Why are you using AWT components and not Swing components anyway? If this were a Swing application, you'd show the second window as a JDialog, and all would work well.
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    2. COI only ran the uncompilable code to see exactly what it said. With netbeans I can run the uncompilable code and test the parts that do work(the above program is crippled so I can get my point across without tons of extra code). I'm fairly new to java btw. I'm kind of just playing with this, and I'm going to play a little with swing later.
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    3. CORegardless if you *can* run uncompilable code, you really *shouldn't*. NetBeans or any decent IDE will tell you what compilation errors you may have and may even offer suggestions on how to fix them.
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