CODEWITHSUNDEEP
javaswingjtablejpanel
James
James

Reputation: 13

JTable not visible when added to Jpanel

I have JButton in the front panel. When it is clicked it should display the data in table format. I have assigned the data and column names to JTable parameter but it is not visible in the front end. I confirmed the values are assigned correctly but not sure why table is not visible in the panel. Here is my code:

private void disPlayDataActionPerformed(java.awt.event.ActionEvent evt) {                                        
    // TODO add your handling code here:
       sql = "select * from persons";   

    try {
              Statement  st = con.createStatement();
              ResultSet rs = st.executeQuery(sql);
              ResultSetMetaData metaData = rs.getMetaData();
              int columnCount=metaData.getColumnCount();
              String[]columnNames=new String[columnCount];

              for(int i=0;i< columnNames.length;i++){
                columnNames[i]=metaData.getColumnName(i+1);

        }                       
        ArrayList<String[]> rows=new ArrayList<>();
        while(rs.next()){
            String[]currentrow=new String[columnCount];
            for(int i=0;i<columnCount;i++){
                currentrow[i]=rs.getString(i+1);

        }

              rows.add(currentrow);
        }   
        String[][] rowsArray=new String[rows.size()][columnCount];
        rowsArray=rows.toArray(rowsArray);
        JTable jt=new JTable(rowsArray,columnNames);
        jPanel2.add(jt);
        jt.setVisible(true);



    } catch (SQLException ex) {
        Logger.getLogger(EmployeePanel.class.getName()).log(Level.SEVERE, null, ex);
    }

    finally{

    }

}

Upvotes: 1

Views: 1734

Answers (2)

MadProgrammer
MadProgrammer

Reputation: 347184

Swing's layout API is lazy, it's designed this way. You need to tell it when you're ready for it revalidate the container hirarcy.

JTable jt=new JTable(rowsArray,columnNames);
jPanel2.add(jt);
jPanel2.revalidate();
jPanel2.repaint();

Without knowing your full code, generally speaking, it's much easier to simply have a main JTable and change it's model when ever you need to.

Upvotes: 0

Vishal Gajera
Vishal Gajera

Reputation: 4207

can you try this one, 

JTable jt=new JTable(rowsArray,columnNames);  
jt.setBounds(30,40,200,300);   // you can put dimension as per your wish...

JScrollPane sp=new JScrollPane(jt);  
jPanel2.add(sp);
// code fore set visible true to jpanel2...

Upvotes: 1

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