How to declare enum has jtable header column

Question

Hi I have Jtable with some columns the first two are sortable,vegetarian column is combobox and now I Want to change the header column to enum . So I want to change the code such that enum should be my header column... please give me reply I am trying this program since last night

class MyTable extends JFrame  {

    /*public enum ColumNames {
        FIRSTNAME, LASTNAME, DEPARTMENT, SALARY,
        YEARS, VEGETARIAN, GENDER,AGE;


    }*/




    private JPanel topPanel;
    private JTable table;
    private JScrollPane scrollPane;
    private String[] columnNames;
    private Object[][] dataValues;
    JTextField textBox = new JTextField();

    public MyTable() {
        setTitle("MyTable");
        setSize(300, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        topPanel = new JPanel();
        topPanel.setLayout(new BorderLayout());
        getContentPane().add(topPanel);
        columnNames = new String[] { "FirstName", "LastName", "Department", "Salary", "Years", "Vegetarian", "Gender",
                "Age" };
        dataValues = new Object[][] {
                { "Kathy", "Smith", "Networking", new Integer(50000), new Integer(5), new Boolean(false), "Male",
                        new Integer(35) },
                { "John", "Doe", "Testing", new Integer(65000), new Integer(3), new Boolean(true), "Male",
                        new Integer(45) },
                { "Sue", "Black", "Testing", new Integer(60000), new Integer(2), new Boolean(false), "Male",
                        new Integer(40) },
                { "Jane", "White", "Developer", new Integer(70000), new Integer(20), new Boolean(true), "Male",
                        new Integer(35) },
                { "Joe", "Brown", "Networking", new Integer(60000), new Integer(10), new Boolean(false), "Male",
                        new Integer(30) } };

        myTableModel model = new myTableModel();


        table = new JTable();
        table.setRowHeight(50);
        table.setModel(model);
        TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(table.getModel()){


            @Override
            public boolean isSortable(int ColumnNames) {
                if(ColumnNames < (2))
                    return true;
                else 
                    return false;
            }};


        table.setRowSorter(sorter);


        setUpVegColumn(table,table.getColumnModel().getColumn(5));
        setUpSalColumn(table, table.getColumnModel().getColumn(3));


        table.setCellSelectionEnabled(true);
        scrollPane = new JScrollPane(table);
        topPanel.add(scrollPane, BorderLayout.CENTER);

    }





    private void setUpSalColumn(JTable table, TableColumn column) {
        TableColumn salary = table.getColumnModel().getColumn(3);
        salary.setCellEditor(new DefaultCellEditor(textBox));
        String s =textBox.getText();
        Pattern pattern = Pattern.compile("^[0-9]*$");
        Matcher m = pattern.matcher(s);
        if((!m.matches())){

            textBox.setEditable(false);

        JOptionPane.showMessageDialog(null, "enter numbers only");
            }
            else
            {
            textBox.setEditable(true);
            }
            }





    private void setUpVegColumn(JTable table, TableColumn column ) {
        JComboBox comboBox = new JComboBox();
        DefaultComboBoxModel model = new DefaultComboBoxModel();
        model.addElement("True");
        model.addElement("False");
        model.addElement("Both");

        model.addElement("None of the above");
        comboBox.setModel(model);
        column.setCellEditor(new DefaultCellEditor(comboBox));

        model = new DefaultComboBoxModel();
        model.addElement("True");
        model.addElement("False");

        model.addElement("Both");
        model.addElement("None of the above");
        // Set up tool tips for the sport cells.
        ComboBoxTableCellRenderer renderer = new ComboBoxTableCellRenderer();
        renderer.setModel(model);
        column.setCellRenderer(renderer);

    }


    class ComboBoxTableCellRenderer extends JComboBox implements TableCellRenderer {

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
                int row, int column) {
            setSelectedItem(value);
            return this;
        }

    }

    public class myTableModel extends DefaultTableModel {
        myTableModel() {
            super(dataValues, columnNames);
        }

        @Override
        public boolean isCellEditable(int row, int cols) {
            if(cols==3 || cols==5){

                return true;
            }
            else{
                return false;
            }
        }
    }

    public static void main(String args[]) {
        MyTable x = new MyTable();
        x.setVisible(true);
    }

You can use ColumNames.values(). The public DefaultTableModel(Object[][] data, Object[] columnNames) { setDataVector(data, columnNames); } , accept an array of objects. — hasnae, Jan 21 '16 at 12:02
For validation issue you can use CellEditor, you can find an example here http://stackoverflow.com/questions/7531513/how-to-mark-jtable-cell-input-as-invalid/7539298#7539298 — hasnae, Jan 21 '16 at 14:06

score 1 · Answer 1 · answered Jan 21 '16 at 12:00

An enum is a collection of static instances of that enum type. Therefore ColumNames.FIRSTNAME is of type ColumNames, while you need a String for header. You can either use the the value of the instance, however this might not give you what you want:

public enum ColumNames {
    FIRSTNAME, LASTNAME, DEPARTMENT, SALARY,
    YEARS, VEGETARIAN, GENDER,AGE;
}
final int numberOfColumns = ColumNames.values().length;
columnNames = new String[numberOfColumns ];
for (int i = 0; < numberOfColumns; i++) {
  columnNames[i] = ColumNames.values()[i].name();
}

This will give you the equivalent array to:

columnNames = new String[] { "FIRSTNAME", "LASTNAME", "DEPARTMENT", "SALARY", "YEARS", "VEGETARIAN", "GENDER", "AGE" };

Or you can define a display method on your enum and use that instead of name():

public enum ColumNames {
    FIRSTNAME("FirstName"), 
    LASTNAME("LastName"),
    DEPARTMENT("Department"),
    SALARY("Salary",
    YEARS("Years"),
    VEGETARIAN("Vegetarian"), 
    GENDER("Gender"),
    AGE("Age");
    private final displayName;
    private ColumNames(String displayName){
      this.displayName = displayName;
    }
    public String getDisplayName() {
      return displayName;
    }
}

However if internationalization is an issue, the first approach is the better one, as it uses a constant string independent of the local an can be replaced in the user interface.

score 0 · Answer 2 · answered Jan 25 '16 at 15:49

You need to use an action listener, otherwise the application would not be aware if an action has been performed, here is an example of the method setUpSalColumn:

private void setUpSalColumn(JTable table, TableColumn column) {
        TableColumn salary = table.getColumnModel().getColumn(3);
        textBox.getDocument().addDocumentListener(new DocumentListener() {
            public void changedUpdate(DocumentEvent e) {
                validateSal();
            }

            public void removeUpdate(DocumentEvent e) {
                validateSal();
            }

            public void insertUpdate(DocumentEvent e) {
                validateSal();
            }

            public void validateSal() {
                Pattern pattern = Pattern.compile("^[0-9]*$");
                String s = textBox.getText();
                Matcher m = pattern.matcher(s);
                if ((!m.matches())) {
                    JOptionPane.showMessageDialog(null, "enter numbers only");
                } else {
                    textBox.setEditable(true);
                }
            }
        });
        salary.setCellEditor(new DefaultCellEditor(textBox));

    }

How to declare enum has jtable header column

2 Answers2