CODEWITHSUNDEEP
javaswinguser-interface
Aakash Sasikumar
Aakash Sasikumar

Reputation: 27

How To Change JTable After Initialization?

Im pretty new to Swing development in Java. I need some help with populating a table with some values that I have, after the initialization is done.

someClass extends JPanel{
private JLabel something;
static private JTable Table;
private JPanel temp;

someClass(){
    setLayout(new BorderLayout());
    selectSong = new JLabel("some text");
    temp = new JPanel();
    temp.setLayout(new FlowLayout());
    temp.add(something);
    Table = new JTable();
    //Table.setVisible(false);
    add(temp, BorderLayout.NORTH);

    add(new JScrollPane(Table), BorderLayout.CENTER);

}
static void populateTable(ArrayList<String> list){
    DefaultTableModel dtm = new DefaultTableModel();
    dtm.addColumn("title", list.toArray());
    Table = new JTable(dtm);
    Table.setVisible(true);
    new someClass().add(new JScrollPane(Table), BorderLayout.CENTER);
}
}

This class called someClass is a subclass of JPanel. I am using an object of this and appending it to the Main Frame(not shown here). According to this, initially a GUI form is created with an empty table, and after some operations are done, I call the populateTable function, I want this to change the values of the table to have one column (named title) and containing the arraylist elements in the subsequent rows.

Upvotes: 0

Views: 879

Answers (3)

Igor Vuković
Igor Vuković

Reputation: 764

You should use fireTableDataChanged method

https://docs.oracle.com/javase/7/docs/api/javax/swing/table/AbstractTableModel.html#fireTableDataChanged()

Upvotes: 0

Aelop
Aelop

Reputation: 156

someClass extends JPanel{
    private JLabel something;
    static private JTable Table;
    private JPanel temp;
    private DefaultTableModel dtm;

    someClass(){
        setLayout(new BorderLayout());
        selectSong = new JLabel("some text");
        temp = new JPanel();
        temp.setLayout(new FlowLayout());
        temp.add(something);
        dtm= new DefaultTableModel();
        Table = new JTable(dtm);
        add(temp, BorderLayout.NORTH);

        add(new JScrollPane(Table), BorderLayout.CENTER);

    }
    static void populateTable(ArrayList<String> list){
        dtm.addColumn("title", list.toArray());
    }
    }

this is how your class should look like

Upvotes: 1

Thibstars
Thibstars

Reputation: 1083

Assuming you called your JTable 'table':

static void populateTable(ArrayList<String> list){
        DefaultTableModel dtm = new DefaultTableModel();
        dtm.addColumn("title", list.toArray());
        table.setModel(dtm);
    }
    }

You should also not call table.setVisible(true); in that method, as it has nothing to do with populating the table.

Edit: as suggested by others: it would also be better to make use of a class attribute for the DefaultTableModel.

Upvotes: 2

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