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POWhy does this JTable get cut in half when repainting?
 

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  1. POWhy does this JTable get cut in half when repainting?
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    <p>Please help me debug code. I am making a calendar using JTable, but whenever I press the next or previous buttons, the calendar doesn't repaint properly. It gets "cut in half" and then another press it disappears. I have tried different ways to handle this but I really have no clue.</p> <p>Here is the code:</p> <pre><code>import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; import javax.swing.table.DefaultTableModel; import javax.swing.table.TableModel; import java.util.*; import java.lang.*; public class NewCalendar extends JFrame { private JFrame frame = new JFrame(); private Object[] colNames = {"Sun","Mon","Tue","Wed","Thurs","Fri","Sat"}; private Object[][] days = new Object[6][7]; private JLabel lblMonth, lblYear; private JButton btnPrev, btnNext, pinBoard, addEntry; private Container pane; private JPanel pnlCalendar; private JComboBox cmbYear; private int realYear, realMonth, realDay, currYear, currMonth; GregorianCalendar calx = new GregorianCalendar(); GregorianCalendar cal; JScrollPane scroll; JTable table; TableModel model; int row; int column; public NewCalendar() { realDay = calx.get(GregorianCalendar.DAY_OF_MONTH); realMonth = calx.get(GregorianCalendar.MONTH); realYear = calx.get(GregorianCalendar.YEAR); //cal = new GregorianCalendar(2012, 10, 27); //cal = new GregorianCalendar(realYear, 9, realDay); cal = new GregorianCalendar(realYear, realMonth+1, realDay); GregorianCalendar cald = new GregorianCalendar(realYear, realMonth, realDay); int nod = cald.getActualMaximum(GregorianCalendar.DAY_OF_MONTH); int som = cal.get(GregorianCalendar.DAY_OF_WEEK); System.out.println(realYear + " " + realMonth + " " + realDay); currYear = realYear; currMonth = realMonth; for( int i=1; i&lt;=nod; i++ ) { row = new Integer((i+som-2)/7); column = (i+som-2)%7; days[row][column] = new Integer(i); } TableModel model = new DefaultTableModel(days, colNames) { private static final long serialVersionUID = 1L; public boolean isCellEditable(int row, int column) { return days[row][column] != null; } }; table = new JTable(model); table.setRowHeight(38); table.setColumnSelectionAllowed(true); table.setRowSelectionAllowed(true); table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); for(int i=0; i&lt;7; i++) { table.getColumnModel().getColumn(i).setCellEditor(new ClientsTableRenderer(new JCheckBox())); } table.getTableHeader().setReorderingAllowed(false); table.setPreferredScrollableViewportSize(table.getPreferredSize()); table.setShowHorizontalLines(true); table.setShowVerticalLines(true); scroll = new JScrollPane(table); /*frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout( new BorderLayout() ); frame.pack(); frame.add(scroll); frame.setLocation(150,150); frame.setVisible(true); frame.setSize(325,450); frame.setResizable(false);*/ this.setTitle("Calendar"); this.setSize(325,450); pane = this.getContentPane(); pane.setLayout(null); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true); this.setResizable(false); //create controls lblMonth = new JLabel("January"); lblYear = new JLabel("Change year: "); cmbYear = new JComboBox(); btnPrev = new JButton("&lt;&lt;"); btnNext = new JButton("&gt;&gt;"); pinBoard = new JButton("Go to Pin Board"); addEntry = new JButton("Add Entry"); pnlCalendar = new JPanel(null); for( int i=realYear-100; i&lt;=realYear+100; i++) { cmbYear.addItem(String.valueOf(i)); } //register action listeners btnPrev.addActionListener( new btnPrev_Action() ); btnNext.addActionListener( new btnNext_Action() ); cmbYear.addActionListener( new cmbYear_Action() ); //add controls to pane pane.add(pnlCalendar); pnlCalendar.add(scroll); pnlCalendar.add(lblMonth); pnlCalendar.add(lblYear); pnlCalendar.add(cmbYear); pnlCalendar.add(btnPrev); pnlCalendar.add(btnNext); pnlCalendar.add(pinBoard); pnlCalendar.add(addEntry); //set bounds pnlCalendar.setBounds(0,0,500,500); lblMonth.setBounds(160-lblMonth.getPreferredSize().width/2, 25, 100,25); lblYear.setBounds(10,305,80,20); cmbYear.setBounds(230,305,80,20); btnPrev.setBounds(10,25,50,25); btnNext.setBounds(260,25,50,25); pinBoard.setBounds(10,340,300,25); addEntry.setBounds(10,380, 300, 25); scroll.setBounds(10,50,300,250); refreshCalendar( currMonth, currYear); //refresh calendar } public void refreshCalendar( int month, int year ) { String[] months = {"January","February","March","April","May","June","July","August","September","October","November","December"}; int nod, som; //number of days, start of month btnPrev.setEnabled(true); btnNext.setEnabled(true); days = new Object[6][7]; if( month == 0 &amp;&amp; year &lt;= realYear-100) btnPrev.setEnabled(false); if( month == 11 &amp;&amp; year &gt;= realYear+100 ) btnNext.setEnabled(false); lblMonth.setText(months[month]); //refresh month label lblMonth.setBounds(160-lblMonth.getPreferredSize().width/2, 25,180,25); //re-align label with calendar cmbYear.setSelectedItem(String.valueOf(year)); cal = new GregorianCalendar(year, month, 1); System.out.println("refreshed: " + year + " " + month + " 1"); nod = cal.getActualMaximum(GregorianCalendar.DAY_OF_MONTH); som = cal.get(GregorianCalendar.DAY_OF_WEEK); for( int i=1; i&lt;=nod; i++ ) { row = new Integer((i+som-2)/7); column = (i+som-2)%7; days[row][column] = new Integer(i); } for(int i = 0; i &lt; 6; i++) { for(int j = 0; j &lt; 7; j++) { if(days[i][j] == null) System.out.print(" "); else System.out.print(days[i][j]+""); System.out.print("\t"); } System.out.println(); } TableModel model1 = new DefaultTableModel(days, colNames) { private static final long serialVersionUID = 1L; public boolean isCellEditable(int row, int column) { return days[row][column] != null; } }; JTable table1 = new JTable(model1); table1.setRowHeight(38); table1.setColumnSelectionAllowed(true); table1.setRowSelectionAllowed(true); table1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); for(int i=0; i&lt;7; i++) { table1.getColumnModel().getColumn(i).setCellEditor(new ClientsTableRenderer(new JCheckBox())); } table1.getTableHeader().setReorderingAllowed(false); table1.setPreferredScrollableViewportSize(table.getPreferredSize()); table1.setShowHorizontalLines(true); table1.setShowVerticalLines(true); JScrollPane scroll1 = new JScrollPane(table1); // scroll = scroll1; pnlCalendar.removeAll(); pnlCalendar.add(scroll1); pnlCalendar.add(lblMonth); pnlCalendar.add(lblYear); pnlCalendar.add(cmbYear); pnlCalendar.add(btnPrev); pnlCalendar.add(btnNext); pnlCalendar.add(pinBoard); pnlCalendar.add(addEntry); pnlCalendar.revalidate(); // pnlCalendar.repaint(); // pane.repaint(); } public static void main( String[] args ) throws Exception { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); /*EventQueue.invokeLater(new Runnable() { public void run() { new NewCalendar(); } });*/ new NewCalendar(); } class ClientsTableRenderer extends DefaultCellEditor { private JButton button; private String label; private boolean clicked; private int row, col; private JTable table; public ClientsTableRenderer(JCheckBox checkBox) { super(checkBox); button = new JButton(); button.setOpaque(true); button.addActionListener(new ActionListener() { public void actionPerformed( ActionEvent e ) { fireEditingStopped(); } }); } public Component getTableCellEditorComponent( JTable table, Object value, boolean isSelected, int row, int column) { this.table = table; this.row = row; this.col = column; button.setForeground(Color.black); button.setBackground(UIManager.getColor("Button background")); label = (value == null) ? "" : value.toString(); button.setText(label); clicked = true; return button; } public Object getCellEditorValue() { if(clicked) { //this is what happens when a cell is clicked JOptionPane.showMessageDialog( button, "Column with Value: "+table.getValueAt(row,col)+" - Clicked!\n Row: "+row+" Column: "+col); } clicked = false; return new String(label); } public boolean stopCellEditing() { clicked = false; return super.stopCellEditing(); } protected void fireEditingStopped() { super.fireEditingStopped(); } } class btnPrev_Action implements ActionListener { public void actionPerformed(ActionEvent e) { if( currMonth == 0 ) { currMonth = 11; currYear -= 1; } else { currMonth -= 1; } refreshCalendar(currMonth, currYear); } } class btnNext_Action implements ActionListener { public void actionPerformed(ActionEvent e) { if( currMonth == 11 ) { currMonth = 0; currYear += 1; } else { currMonth += 1; } refreshCalendar(currMonth, currYear); } } class cmbYear_Action implements ActionListener { public void actionPerformed(ActionEvent e) { if( cmbYear.getSelectedItem() != null ) { String b = cmbYear.getSelectedItem().toString(); currYear = Integer.parseInt(b); //ssrefreshCalendar(currMonth, currYear); } else { currMonth -= 1; } refreshCalendar(currMonth, currYear); } } } </code></pre>
    singulars
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. UStrashgod
    1. UScrispyfriedchicken
    plurals
    1. PL
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      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    2. PO
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      1. PTAnswer
    1. VO
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      1. POWhy does this JTable get cut in half when repainting?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThe `homework` tag is deprecated now, see the bulletin on the right.
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      1. POWhy does this JTable get cut in half when repainting?
      1. USErick Robertson
    2. CO+1 for providing an [sscce](http://sscce.org/); also consider [tag:jcalendar].
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      1. POWhy does this JTable get cut in half when repainting?
      1. UStrashgod
 

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