Anu Bhagat

I am trying to make a decision for data transfer appraoch in a java application.
I am not sure if I should use JSON or XML.
Any comments will be useful.

Thanks in advance.

Anu Bhagat

Please give any pointer hint that will help me to hilight the current line with different color than all the previously visited lines.

Thanks in advance Here is my java class

Anu


/** * * @author bhagata */ public class StepExer extends javax.swing.JFrame { /** Creates new form StepExer */ public StepExer() { initComponents(); } /** This method is called from within the constructor to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { loadButton = new javax.swing.JButton(); stepButton = new javax.swing.JButton(); jScrollPane1 = new javax.swing.JScrollPane(); jTextArea1 = new javax.swing.JTextArea(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); loadButton.setText("Load"); loadButton.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { loadButtonActionPerformed(evt); } }); stepButton.setText("Step"); stepButton.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { stepButtonActionPerformed(evt); } }); jTextArea1.setColumns(20); jTextArea1.setRows(5); jScrollPane1.setViewportView(jTextArea1); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(50, 50, 50) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 335, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(80, Short.MAX_VALUE)) .addGroup(layout.createSequentialGroup() .addGap(78, 78, 78) .addComponent(loadButton) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 130, Short.MAX_VALUE) .addComponent(stepButton) .addGap(147, 147, 147)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(23, 23, 23) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 149, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 50, Short.MAX_VALUE) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(loadButton) .addComponent(stepButton)) .addGap(21, 21, 21)) ); pack(); }// </editor-fold> private void loadButtonActionPerformed(java.awt.event.ActionEvent evt) { JFileChooser fileChooser = new JFileChooser(); fileChooser.setCurrentDirectory( new File( "./output/cmd") ); fileChooser.addChoosableFileFilter(new TextFilter()); int caretPosition = 0; //at the start the file //typeString = null; int actionDialog = fileChooser.showOpenDialog(this); if (actionDialog == JFileChooser.APPROVE_OPTION) { File selectedFile = fileChooser.getSelectedFile(); try{ BufferedReader input = new BufferedReader(new FileReader(selectedFile)); String line; //load the contents of the selected file in jTextArea1 while (( line = input.readLine()) != null){ jTextArea1.append(line + "\n"); numLines++; } //System.out.println("number of lines in the laoded file = " + numLines); input.close(); jTextArea1.setCaretPosition(caretPosition); }catch(FileNotFoundException fnfe){ System.out.println("An error has occurred" + fnfe); }catch(IOException ioe) { System.out.println("An error has occurred" + ioe); } } } private void stepButtonActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: try { // TODO add your handling code here: hasDiagramChanged = true; int executedStartIndex = 0; int executedEndIndex = 0; //System.out.print(" numLines = " + numLines + " lineNumber " + lineNumber); if (lineNumber <= numLines) { startIndex = jTextArea1.getLineStartOffset(lineNumber); endIndex = jTextArea1.getLineEndOffset(lineNumber); //System.out.println(" startIndex = " + startIndex + " endIndex= " + endIndex); jTextArea1.setCaretPosition(endIndex); //PAINT CURRENTLY VISITED LINE WITH YELLOW- WORKS yellowpainter = new DefaultHighlighter.DefaultHighlightPainter(Color.YELLOW); jTextArea1.getHighlighter().addHighlight(startIndex, endIndex, yellowpainter); lineNumber++; //System.out.println(" lineNumber " + lineNumber); } else { System.out.println("end of the file"); //jTextArea1.setCaretPosition(jTextArea1.getText().length() -1); } //for (int i = 0; i < lineNumber; i++) {//WANT TO PAINT GRAY HERE- DOES NOT WORK- PREVIOUSLY VISITED LINE REMIAN GRAY executedStartIndex = jTextArea1.getLineStartOffset(0);; //jTextArea1.getLineStartOffset(i); System.out.println("lineNumber= " + lineNumber ); executedEndIndex = jTextArea1.getLineEndOffset(lineNumber-1); System.out.println(" (lineNumber-1) = " + (lineNumber-1) + " executedStartIndex = " + executedStartIndex + " executedEndIndex = " + executedEndIndex ); graypainter = new DefaultHighlighter.DefaultHighlightPainter(Color.GRAY); jTextArea1.getHighlighter().addHighlight(executedStartIndex, executedEndIndex, graypainter); //System.out.println(" DID WE GET HERE MUST HAVE PAINTED GRAY "); //} } catch (BadLocationException ex) { System.out.println("We got exception in stepButtonActionPerformed"); Logger.getLogger(StepExer.class.getName()).log(Level.SEVERE, null, ex); } } //Class to create a filer for filechooser //change the filer to .cmd files class TextFilter extends javax.swing.filechooser.FileFilter { public boolean accept(File file) { String filename = file.getName(); //return filename.endsWith(".txt"); return filename.endsWith(".cmd"); } public String getDescription() { //return "*.txt"; return "*.cmd"; } } /** * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new StepExer().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextArea jTextArea1; private javax.swing.JButton loadButton; private javax.swing.JButton stepButton; // End of variables declaration private Highlighter.HighlightPainter graypainter; private Highlighter.HighlightPainter yellowpainter; int numLines = 0; int lineNumber = 0; int startIndex = 0; int endIndex = 0; boolean hasDiagramChanged = false; }

I can highlight visited lines in one color. I want to highlight previously visited lines with gray and the current line with yellow.
My code is as follows. With this all visted lines are highlighted with yellow. When step button is clicked the actionPerformed method is invoked.

Please help Thanks in advance.

Anu


public class stepper { private javax.swing.JButton stepButton; private Highlighter.HighlightPainter graypainter; private Highlighter.HighlightPainter yellowpainter; int numLines = 0; int lineNumber = 0; int startIndex = 0; int endIndex = 0; private void stepButtonActionPerformed(java.awt.event.ActionEvent evt) { try { hasDiagramChanged = true; int executedStartIndex = 0; int executedEndIndex = 0; if (lineNumber <= numLines) { startIndex = jTextArea1.getLineStartOffset(lineNumber); endIndex = jTextArea1.getLineEndOffset(lineNumber); //System.out.println(" startIndex = " + startIndex + " endIndex= " + endIndex); jTextArea1.setCaretPosition(endIndex); //graypainter = new DefaultHighlighter.DefaultHighlightPainter(Color.GRAY); yellowpainter = new DefaultHighlighter.DefaultHighlightPainter(Color.YELLOW); jTextArea1.getHighlighter().addHighlight(startIndex, endIndex, yellowpainter); lineNumber++; //System.out.println(" lineNumber " + lineNumber); } else { System.out.println("end of the file"); //jTextArea1.setCaretPosition(jTextArea1.getText().length() -1); } //Now use gray painter for previously visited lines except for the current line. THIS DOES NOT WORK. I NEED HELP WITH THIS. executedStartIndex = jTextArea1.getLineStartOffset(0); executedEndIndex = jTextArea1.getLineEndOffset(lineNumber-1); graypainter = new DefaultHighlighter.DefaultHighlightPainter(Color.GRAY); jTextArea1.getHighlighter().addHighlight(executedStartIndex, executedEndIndex, graypainter); } catch (BadLocationException ex) { System.out.println("We got exception in stepButtonActionPerformed"); Logger.getLogger(SequenceStepper.class.getName()).log(Level.SEVERE, null, ex); } } }

setVisible(false) and dispose() dit it. Sorry to bother.

Thanks any way...

Anu

I have implemented a JOptionPane confirm dialog with YES NO option with the code below
int result = JOptionPane.showConfirmDialog((Component) null,
"Do you really want to quit?",
"alert", JOptionPane.YES_NO_OPTION);

I can get the user response with the code below
if (result == JOptionPane.YES_OPTION) {
System.out.println(" you selected YES option");}

I want to close the parent window when user selects YES_OPTION.

How can I do this?

Thanks in advance.

Anu

Hi Michael,

Thanks much. This is exactly what I wanted to do.

Regards,

Anu Bhagat

Michael Dunn wrote:> I want to hilight certain line when mouse os on that line in the TextArea.

by mouse on that line, if you mean the caret i.e. click the line, the line is highlighted
something like this perhaps, or look up the Highlighter class

(easier to show it, than try to explain it)
import javax.swing.*; import javax.swing.text.*; import java.awt.event.*; import java.awt.*; class Testing { String text = "Mary had a little lamb\nwhose fleece was white as snow\nand everywhere that mary went\nthe lamb was sure to go"; JTextArea ta = new JTextArea(text,10,20); public void buildGUI() { JFrame f = new JFrame(); f.getContentPane().add(new JScrollPane(ta),BorderLayout.CENTER); f.pack(); f.setLocationRelativeTo(null); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); ta.addMouseListener(new MouseAdapter(){ public void mouseReleased(MouseEvent me){ Element root = ta.getDocument().getDefaultRootElement(); ta.setCaretPosition(root.getElement(root.getElementIndex(ta.getCaretPosition())).getEndOffset()-1); ta.moveCaretPosition(root.getElement(root.getElementIndex(ta.getCaretPosition())).getStartOffset()); } }); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable(){ public void run(){ new Testing().buildGUI(); } }); } }

Thanks for the response.
I can get text in textarea by following line of code

String taContains = myTextArea.getText();

taContains string contains text with new lines.

I want to hilight certain line when mouse os on that line in the TextArea. How to achieve this? Thanks

Anu

I want to step through the text in JTextArea.
I can display text from a file using JFileChooser, and I can save the contents of text in JTextArea to a file.

I need to know hot to step trhough the text in JtextArea. Please any pointer, code sample will be greatly appreciated.

Thanks.

Anu

I solved it. It was a simple oversight on my part. Thanks for listening to me.

Anu

I am stuck on the repaint issue.

Here is the description of the problem

I have a myFrame which extends from JFrame,
I have myPanel (JPanel) and I add this to myFrame,

I then make few components and add them to myPanel

I move these components around in myPanel.. now I set a new size of myPanel.

I repaint myPanel. My components appear fine but myPanel does not resize to the new size that I set above.

This is done in a large application so I don not have code to provide.

I am really stuck on this problem, and would deeply appreciate any help.

Thanks in advance..

Anu

I am new to javaFx. I have build my first hello world JavaFx Application. still trying to understand what are the benefits of using JavaFX? Can we add JavaFX GUI to existing Swing GUI? Can we Use JavaFx GUI from Java code?

Are there any good web sites, books, that will help some one to get started and understand it well? may be something like Head First series....

Thanks.

Anu Bhagat

Congratulations!

Andrew,

Actually I tried to send you an email regarding the error today at
scjd@apress.com (To contact the authors this is the address mentioned in the book ), and my email did not make it. i got delivery failed due to incorrect address.

I was going to contact you through this forum about this error, but then I found this post on the forum, which helped me to solve the issue.

The book still has the same error on Page 309. I was able to run the client in the networked mode only after I found this post.

Thanks for the post.

Anu Bhagat

Thank you for your wishes for SCJD.

Regards,

Anu