JCheckBox 检查 JTable 列中的值

Question

I am a beginner at Java GUIs.

I have a JTable with a few columns and one of those columns has values for some rows and for some other rows there are no values.

I would like to make a JCheckBox listener see if there are values inside that column of the JTable, and if the box is selected to resort the table showing those values. If I uncheck the box, I want the table to be shown with the no values in that column. How could the above be done? Thank you. Here is my code. I also have some two JComboBox that do what I want them to do.

public class myGui extends JPanel implements ActionListener{

JPanel pane = new JPanel();
JPanel pane2 = new JPanel();    
AccomodationList list;
String[] roomOrCabin = {"Room","Cabin"};
String[] booked = {"Booked","Not Booked","All"};
JComboBox dropRoom = new JComboBox(roomOrCabin); 
JComboBox dropBook = new JComboBox(booked);
JCheckBox ownerButton = new JCheckBox("Owner",true);
JTable table;
DefaultTableModel model;
Vector<String> columnNames;
TableRowSorter<TableModel> trs;

public myGui(AccomodationList list){

    super(new BorderLayout());
    pane.setLayout( new BorderLayout() );

    columnNames = new Vector<String>();             

    columnNames.addElement("Accomodation Number");
    columnNames.addElement("Number of Beds");
    columnNames.addElement("Number of Rooms");
    columnNames.addElement("Type");
    columnNames.addElement("Cost per Night");
    columnNames.addElement("Owner");
    columnNames.addElement("Booked");
    columnNames.addElement("Client");
    columnNames.addElement("Booked Statistics");        

    Vector<Vector> f = populateTable(list);

    table = new JTable(f, columnNames);
    JScrollPane scroll = new JScrollPane(table);
    model = new DefaultTableModel(f,columnNames){
        @Override
        public Class getColumnClass(int column) {
          Class returnValue;
          if ((column >= 0) && (column < getColumnCount())) {
            returnValue = getValueAt(0, column).getClass();
          } else {
            returnValue = Object.class;
          }
          return returnValue;
        }
    };
    trs = new TableRowSorter<TableModel>(model);


    table.setRowSorter(trs);

    this.list = list;
    pane.add(table);
    JScrollPane scrollPane = new JScrollPane( table );
    table.setAutoCreateRowSorter(false);
    pane.add( scrollPane, BorderLayout.CENTER );

    pane2.add(dropRoom);
    pane2.add(dropBook);
    pane2.add(ownerButton);
    pane.add(pane2,BorderLayout.SOUTH);
    this.add(pane);
    dropRoom.addActionListener(this);
    dropBook.addActionListener(this);
    ownerButton.addActionListener(this);

}

public Vector<Vector> populateTable(AccomodationList list){

    Vector<Vector> f = new Vector<Vector>();

    String t;

    for(Accomodation a: list.getList()){
        Vector<Object> v = new Vector<Object>();
        t=String.valueOf(a.getNoAcc());
        v.addElement(a.getNoAcc()); 
        t=String.valueOf(a.getSumOfBeds());
        v.addElement(t);    
        t=String.valueOf(a.getNoBedrooms());
        v.addElement(t);    
        t=String.valueOf(a.getType());
        v.addElement(t);
        t=String.valueOf(a.getCost());
        v.addElement(t);
        t=String.valueOf(a.getInitials(a.getOwner()));
        v.addElement(t);
        t=String.valueOf(a.getBooked().toString());
        v.addElement(t);
        t=String.valueOf(a.getInitials(a.getClient()));
        v.addElement(t);
        t=String.valueOf(a.getBookedCnt());
        v.addElement(t);

        f.addElement(v);
    }
    return f;

}

@Override
public void actionPerformed(ActionEvent e) {

    if(e.getSource() == dropRoom){
                String text = dropRoom.getSelectedItem().toString();
                System.out.println("text: "+text);
                if (text.length() == 0) {
                  trs.setRowFilter(null);
                } else {
                  try {
                    trs.setRowFilter(
                        RowFilter.regexFilter(text));
                  } catch (PatternSyntaxException pse) {
                    System.err.println("Bad regex pattern");
                  }
                }                                  
    }

    if(e.getSource() == dropBook){
                String selected = dropBook.getSelectedItem().toString();
                String text="";
                if ("Booked".equals(selected)){text = "true";}else if("Not Booked".equals(selected)){text = "false";}else{text = "";}
                if (text.length() == 0) {
                  trs.setRowFilter(null);
                } else {
                    try {
                      trs.setRowFilter(
                          RowFilter.regexFilter(text));
                    } catch (PatternSyntaxException pse) {
                      System.err.println("Bad regex pattern");
                    }
                } 

    }
    if(e.getSource() == ownerButton){
        JCheckBox cb = (JCheckBox) e.getSource();
        if (cb.isSelected()) {

                System.out.println("Owner is enabled");

        } 
        else {
            System.out.println("Owner is disabled");


        }

    }
}


}

Each row can have or not have a String value for the column Owner. I want to sort the table on those two facts using the JCheckBox.

Answer 1

Firstly you need to add a listener to your checkbox like so :

checkbox.addItemListener(new ItemListener() {

    @Override
    public void itemStateChanged(ItemEvent e) {
        if(e.getStateChange() == ItemEvent.SELECTED) {


        }else {


        }
    }
});

Now the question is what do you want to do when you select the checkbox. You want some kind of sorting algorithm in your table model. There is a good example at this website :

http://www.java2s.com/Tutorial/Java/0240__Swing/SampleSortingTableModel.htm

You just need to add some kind of Comparable to your entity objects which are represented in the table model. By default empty values will be shown at the bottom anyway.