Thread: Help with JTable and JButton both in separated class file

a) You have 2 instances of JPanelOne. Make a single instance so only this instance gets updated
b) Adding components dynamically at runtime (eg 'one.add(ScrollPane);') requires one to let the JVM know you've done so. Call revalidate and repaint on the parent.

Originally Posted by aussiemcgr

First off, this is something that is generally frowned upon in OOP:

class JPanelOne extends JPanel{
 
          JPanel one;
          JTable jTbl;
 
public JPanelOne()
{
    one = new JPanel();
    add(getJPanel1());
}

What you are doing is extending JPanel, but creating a JPanel inside the class that extends the JPanel. When you extend a JPanel, your class IS a JPanel. Since you are doing databasing, I would hope you have an understanding of inheritance. It doesn't hurt to have a look back at some previous inheritance work to refresh yourself.

Now, I don't have much experience with Databasing, but I have extensively played around with the hell that is JTables. You would think they could make them easier to work with. I believe the issue you are facing is that the JTable doesn't automatically update itself when you change its data vector. You have to actually reset the vectors using the setDataVectors (or whatever it is) method. I am not entirely sure if this is your issue however. I am having trouble reading your code when you have it in php highlights.

what i mean is.. i wanted to add data into JTable dynamically.. where when i click on the button on JPanelTwo class , the data from database will appear in JTable which in JPanelOne class..

Originally Posted by copeg

a) You have 2 instances of JPanelOne. Make a single instance so only this instance gets updated
b) Adding components dynamically at runtime (eg 'one.add(ScrollPane);') requires one to let the JVM know you've done so. Call revalidate and repaint on the parent.

so about the method revalidate and repaint method.. is it something like this??

 
public JPanelOne()
{
   // one = new JPanel();
    add(getJPanel1());
    super.revalidate();
}

Originally Posted by Azriq007

so about the method revalidate and repaint method.. is it something like this??

No. See my post above, and place the call of those methods directly after the call to the method I referred to. This is where you add components to a container after it has been validated, and must revalidate.

Originally Posted by copeg

No. See my post above, and place the call of those methods directly after the call to the method I referred to. This is where you add components to a container after it has been validated, and must revalidate.

have you been saying about his

  jTbl = new JTable(Mv_S.getRowData(), Mv_S.getColumnName());
  JScrollPane scrollPane = new JScrollPane(jTbl);
  one.add(ScrollPane);
  one.revalidate();
  one.repaint();

is it something like that???

maybe this code can make you all understand what i am trying to do here... which right now i am in failed status...

class jPanelButton

import java.awt.event.ActionEvent;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
public class jPanelButton extends JPanel {
 
    private JButton jbtnOne;
    private jPanelTable jPTblOne ;
    public jPanelButton()
    {
 
        jbtnOne = new JButton("Click It");
        jbtnOne.addActionListener(new ActionListener(){
 
            public void actionPerformed(ActionEvent e) {
                String[] columnName = {"School Name","Teachers Name"};
                String[][] rowData = {{"University 1","Mr Larry"},{"Universiti 2","Mr Harrold"}};
                jPTblOne = new jPanelTable(rowData,columnName);
                jPTblOne.revalidate();
            }
 
        });
        setLayout(new FlowLayout());
        add(jbtnOne);
    }
}

class jPanelTable

import javax.swing.*;
import java.awt.*;
public class jPanelTable extends JPanel {
 
    private JTable tblOne;
    private String rowData[][];
    private String columnData[];
    private JScrollPane sp1;
    public jPanelTable(String rowData[][],String columnData[])
    {
        this.rowData = rowData;
        this.columnData = columnData;
        add(getScrollPane());
        revalidate();
    }
    public JTable getTable()
    {
        tblOne = new JTable(rowData,columnData);
        return tblOne;
    }
    public JScrollPane getScrollPane()
    {
        sp1 = new JScrollPane(getTable());
        sp1.setPreferredSize(new Dimension(750,180));
        return sp1;
    }
 
}
 
class testClass

import javax.swing.*;
import java.awt.*;
public class testClass {
 
    public static void main(String[] args) {
        JFrame one = new JFrame("Test");
        String columnName[] = {"Name", "Address", "Location"};
        String[][] data = {
            {"Kathy", "Smith", "Snowboarding"},
            {"John", "Doe", "Rowing"},
            {"Sue", "Black", "Knitting"},
            {"Jane", "White", "Speed reading"},
            {"Joe", "Brown", "Pool"}};
        one.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container con = one.getContentPane();
        con.setLayout(new GridLayout(2,1,5,5));
        con.add(new jPanelTable(data,columnName));
        con.add(new jPanelButton());
        one.setSize(new Dimension(800,600));
        one.setVisible(true);
    }
}

so as i have said before.. i want the new data from the array of string into my JTable which mean replacing the old data in the JTable.. if there any mistakes in my code.. it run successfully but the new data cannot replace the old one in JTable.. help me out please...

Originally Posted by aussiemcgr

So basically, a button is pressed to add data to the table.

Why are they on separate JPanels? Why not just a JButton and a JTable? Where the button, when pressed, will add a row to the JTable. I can give you a piece of code once I get to work (where I have all my JTable stuff) later today.

First why i make it in separate JPanel class is because my real system is quite biq one.. so if the long code in one class can divided into a few class , that's make easier to manage my code and easier to find error if occur..

and if you want to give a code i would really glad to learn it...