JTables

Hi everyone,

I am trying to save the contents the of the jtable together with all its fonts and everything else. The program compiles without any errors but When i try to save the contents of the JTable an exception is thrown in the tablesaveas method in the below method

Please note that i am saving the jtable as an object. I am providing the below runnable example so you guys can compile and run and see what i mean.

Here is the code

Code:

import java.awt.*; import java.io.*; import java.util.*; import java.awt.print.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.table.*; public class JTablesui implements ActionListener, ItemListener { JFrame fr = new JFrame ("Frame"); JDialog Dialog1 = new JDialog (fr, "Row Height"); JLabel Label1 = new JLabel("Label1 ", SwingConstants.RIGHT); JLabel Label2 = new JLabel(" ", SwingConstants.LEFT); JLabel Label3 = new JLabel("Enter table row height in pixels"); JButton Button6 = new JButton("Save As"); JButton Button19 = new JButton("Set Row Height"); JButton Button20 = new JButton("Set Height"); JButton Button21 = new JButton("Close"); JButton Button22 = new JButton("Foreground Color For Cells"); JTextField TextField1 = new JTextField("", 10); JTextField TextField2 = new JTextField("", 20); JTextField TextField3 = new JTextField("", 10); JComboBox ComboBox1; JComboBox ComboBox2 = new JComboBox(); //The below command line sets the model for the JTable which //has two arguments as explained below //The first argument specifies the number of rows for the JTable to display upon //it's initialization //The second argument specifies the number of columns for the JTable to display upon //it's initialization DefaultTableModel TableModel1 = new DefaultTableModel(5, 10); //The below command line sets the table model to the JTable JTable Table1 = new JTable(TableModel1); JScrollPane ScrollPane1 = new JScrollPane(Table1, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS); JFileChooser FileChooser1 = new JFileChooser(); JColorChooser ColorChooser3 = new JColorChooser(); Color Color3; Dimension Size1 = new Dimension(); int FontSize = 12; String FontFamily = "Arial"; String SF = ""; public void initialize () { Container pane = fr.getContentPane(); pane.setLayout(new FlowLayout()); fr.setSize(250,300); fr.setLocation(300,300); fr.setBackground(Color.lightGray); //The below command line must be set to false so that user //resizing is allowed Table1.setAutoCreateColumnsFromModel(false); Size1.width = 350; Size1.height = 250; ScrollPane1.setPreferredSize(Size1); Table1.setModel(TableModel1); //The below command line must be set to JTable.AUTO_RESIZE_OFF so that user //resizing is allowed Table1.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); pane.add(ScrollPane1); pane.add(Button6); pane.add(Button19); pane.add(Button22); combofontfamilyinitialize(); pane.add(ComboBox1); combofontsizeinitialize(); pane.add(ComboBox2); pane.add(Label1); // Use the JAVA constant JFrame.HIDE_ON_CLOSE for subsequent forms in multi form // applications fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Button6.addActionListener(this); Button19.addActionListener(this); Button22.addActionListener(this); ComboBox1.addItemListener(this); ComboBox2.addItemListener(this); fr.pack(); fr.setVisible(true); } public void combofontfamilyinitialize () { //This function fills the combo box with the system available font families GraphicsEnvironment ge1 = GraphicsEnvironment.getLocalGraphicsEnvironment(); String[] k = ge1.getAvailableFontFamilyNames(); ComboBox1= new JComboBox(k); } public void combofontsizeinitialize () { //This function fills the combo box with font sizes ComboBox2.addItem("8"); ComboBox2.addItem("9"); ComboBox2.addItem("10"); ComboBox2.addItem("11"); ComboBox2.addItem("12"); ComboBox2.addItem("14"); ComboBox2.addItem("16"); ComboBox2.addItem("18"); ComboBox2.addItem("20"); ComboBox2.addItem("22"); ComboBox2.addItem("24"); ComboBox2.addItem("26"); ComboBox2.addItem("28"); ComboBox2.addItem("36"); ComboBox2.addItem("48"); ComboBox2.addItem("72"); } public void initializedialog1 () { Container pane1 = Dialog1.getContentPane(); pane1.setLayout(new BoxLayout(pane1, BoxLayout.Y_AXIS)); Dialog1.setSize(250,300); Dialog1.setLocation(300,300); Dialog1.setBackground(Color.lightGray); pane1.add(Label3); pane1.add(TextField3); pane1.add(Button20); pane1.add(Button21); //Use the JAVA constant JDialog.HIDE_ON_CLOSE for subsequent forms in multi form //applications Dialog1.setDefaultCloseOperation(JDialog.HIDE_ON_CLOSE); Button20.addActionListener(this); Button21.addActionListener(this); Dialog1.pack(); Dialog1.setVisible(true); } public void tablesaveas () { //This function saves the model of the table to disk using the user //specified file name //This is the function in which the exception is thrown if(FileChooser1.showSaveDialog(fr) != JFileChooser.APPROVE_OPTION) { return; } try { File f = FileChooser1.getSelectedFile(); SF = (f.toString() + ".DAT"); FileOutputStream fStream = new FileOutputStream(SF); ObjectOutput stream = new ObjectOutputStream(fStream); //The below two command lines saves the table model and table column data //as an object using the user specified file name stream.writeObject(Table1.getModel()); stream.writeObject(Table1.getColumnModel()); stream.writeObject(Table1.getFont()); stream.writeObject(Table1.getForeground()); stream.writeObject(TextField3.getText()); stream.writeObject(Label2); stream.flush(); stream.close(); fStream.close(); } catch (Exception e) { Label1.setText("A table saving error has occurred"); } } public void actionPerformed(ActionEvent event) { JComponent b = (JComponent)event.getSource(); int d, d1; String str3; if(b == Button6) { //This is the function in which the exception is thrown tablesaveas(); } else if(b == Button19) { d = Table1.getRowHeight(); str3 = Integer.toString(d); TextField3.setText(str3); initializedialog1(); } else if(b == Button20) { str3 = TextField3.getText(); d = Integer.parseInt(str3); Table1.setRowHeight(d); } else if(b == Button21) { Dialog1.setVisible(false); } else if(b == Button22) { Color3 = ColorChooser3.showDialog(fr, "Color Chooser", Color.black); //The below command line test to see if the Ok button or the Cancel button //was clicked on the JColorChooser as if no color is selected the JColorChooser //simply returns a null if(Color3 != null) { Table1.editCellAt(0,0); TextField1 = (JTextField)Table1.getEditorComponent(); if(TextField1 != null) { TextField1.setForeground(Color3); } Table1.setSelectionForeground(Color3); Table1.setForeground(Color3); } } } public void itemStateChanged(ItemEvent event) { JComponent c = (JComponent)event.getSource(); if(c == ComboBox1) { Table1.editCellAt(0,0); FontFamily = (String)ComboBox1.getSelectedItem(); Font Font1 = new Font(FontFamily, Font.PLAIN, FontSize); TextField1 = (JTextField)Table1.getEditorComponent(); if(TextField1 != null) { TextField1.setFont(Font1); } Table1.setFont(Font1); } else if(c == ComboBox2) { String h = (String)ComboBox2.getSelectedItem(); FontSize = Integer.parseInt(h); Table1.editCellAt(0,0); Font Font2 = new Font(FontFamily, Font.PLAIN, FontSize); TextField1 = (JTextField)Table1.getEditorComponent(); if(TextField1 != null) { TextField1.setFont(Font2); } Table1.setFont(Font2); } } public static void main(String args[]) { JTablesui a = new JTablesui(); a.initialize(); } }

To be continued on the below thread as this post is longer than
10000 characters, i apologize