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POJDialog to get input, instead get error
 

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    <p>I wrote a class that extends <code>JDialog</code>, to be shown when I press save (save is a <code>JMenuItem</code> object). However, when I press save, I get the dialog with an error of having file name as null, and I didn't get the chance to type anything.</p> <p>What am I doing wrong here? Any help would be appreciated.</p> <p>Thanks.</p> <p>Here is the code for my <code>JDialog</code> extended class:</p> <pre><code>package ui; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JTextField; import javax.swing.border.EmptyBorder; public class SaveImageView extends JDialog { private final JPanel contentPanel = new JPanel (); private JTextField txtFilename; public int type; // 0 -&gt; png, 1 -&gt; jpg, 2 -&gt; gif public String filename; public SaveImageView () { setTitle("Save Image"); setBounds(100, 100, 450, 230); getContentPane().setLayout(null); contentPanel.setBounds(0, 0, 434, 229); contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5)); getContentPane().add(contentPanel); contentPanel.setLayout(null); { JLabel lblFilename = new JLabel("Filename: "); lblFilename.setBounds(10, 95, 58, 20); contentPanel.add(lblFilename); } { txtFilename = new JTextField(); txtFilename.setBounds(78, 95, 123, 20); contentPanel.add(txtFilename); txtFilename.setColumns(10); } { JRadioButton rdbtnGif = new JRadioButton("GIF"); rdbtnGif.setBounds(123, 11, 43, 23); contentPanel.add(rdbtnGif); rdbtnGif.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { type = 2; } }); } { JRadioButton rdbtnJpg = new JRadioButton("JPG"); rdbtnJpg.setBounds(123, 37, 43, 23); contentPanel.add(rdbtnJpg); rdbtnJpg.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { type = 1; } }); } { JRadioButton rdbtnPng = new JRadioButton("PNG"); rdbtnPng.setBounds(123, 63, 45, 23); contentPanel.add(rdbtnPng); rdbtnPng.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { type = 0; } }); } JLabel lblImageTypeTo = new JLabel("Image type to save: "); lblImageTypeTo.setBounds(10, 11, 144, 23); contentPanel.add(lblImageTypeTo); JLabel lblNote = new JLabel("NOTE: Images will be saved in \"output\" folder."); lblNote.setBounds(10, 132, 273, 22); contentPanel.add(lblNote); { JPanel buttonPane = new JPanel(); buttonPane.setBounds(0, 160, 434, 33); contentPanel.add(buttonPane); buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT)); { JButton okButton = new JButton("OK"); okButton.setActionCommand("OK"); buttonPane.add(okButton); getRootPane().setDefaultButton(okButton); okButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { filename = txtFilename.getText(); } }); } { JButton cancelButton = new JButton("Cancel"); cancelButton.setActionCommand("Cancel"); buttonPane.add(cancelButton); } } } } </code></pre> <p>And this is in my main GUI class, this is when I add the <code>ActionListener</code> to the item:</p> <pre><code>////////////////////////////////////////////////////////// // Save - Menu Item // ////////////////////////////////////////////////////////// JMenuItem saveItem = new JMenuItem("Save"); saveItem.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { SaveImageView siv = new SaveImageView(); siv.setVisible(true); String typeStr = (siv.type == 0) ? "png" : ((siv.type == 1) ? "jpg" : "gif"); try { ImageIO.write(img, typeStr, new File("output/" + siv.filename + "." + typeStr)); } catch (IOException e1) { e1.printStackTrace(); } } }); menu.add(saveItem); </code></pre> <p>This is the error I'm getting:</p> <pre><code>java.io.FileNotFoundException: output\null.png (The system cannot find the path specified) at java.io.RandomAccessFile.open(Native Method) at java.io.RandomAccessFile.&lt;init&gt;(Unknown Source) at javax.imageio.stream.FileImageOutputStream.&lt;init&gt;(Unknown Source) at com.sun.imageio.spi.FileImageOutputStreamSpi.createOutputStreamInstance(Unknown Source) at javax.imageio.ImageIO.createImageOutputStream(Unknown Source) at javax.imageio.ImageIO.write(Unknown Source) at ui.PPMViewer$1.actionPerformed(PPMViewer.java:40) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.AbstractButton.doClick(Unknown Source) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$400(Unknown Source) at java.awt.EventQueue$2.run(Unknown Source) at java.awt.EventQueue$2.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.imageio.ImageIO.write(Unknown Source) at ui.PPMViewer$1.actionPerformed(PPMViewer.java:40) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.AbstractButton.doClick(Unknown Source) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$400(Unknown Source) at java.awt.EventQueue$2.run(Unknown Source) at java.awt.EventQueue$2.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) </code></pre>
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    1. UShakuna matata
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    1. COLooks like the code: `filename = txtFilename.getText();` doesn't ever get called. Are you clicking the OK button before saving the image?
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    2. CONo, as soon as I click on save, I get the dialog, and the error immediately
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      1. UShakuna matata
    3. COOh, I see: you create a new SaveImageView when you click the save button, but it doesn't give you time to click the OK button?
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      1. USeboix
 

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