Displaying 2 tables in 1 frame

Question

Hi guys,
I have this problem. I need to display 2 tables (with scroll panes) on a frame. I have tried it a couple of different ways.
1) Using 1 JPanel that has 1 table and then adding that and another table to a JFrame (GridLayout)
2) Using GridLayout on a JPanel and adding that to a JFrame
3) Using 2 JPanel and adding it to a JFrame
4) Placing both JTables on 1 JPanel and then adding that to the JFrame
but it doesn't work. It seems that the table that is added first (not to mention the buttons and textfields) doesn't appear (not visible) only the 2nd table is visible.
This this the latest "version" I've tried.
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.table.TableColumn;
public class Main {
    //Variable declarations
    private JFrame f;
    private JScrollPane ladderSP, resSP;
    private JPanel p0, p1;
    public Main() {
        createTable();
        createResTable();
        createPanelZero();
        createPanelOne();
        createAndShowGUI();
    private void createAndShowGUI() {
        f = new JFrame("Calculate MW");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setLayout(new GridLayout(1,2));
        f.setLocation(100, 100);
        f.add(p0);
        f.add(p1);
        f.pack();
        f.setResizable(false);
        f.setVisible(true);
    private void createPanelZero() {
        p0 = new JPanel(new GridLayout(1,2));
        p0.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        p0.add(ladderSP);
        p0.add(resSP);
    private void createPanelOne() {
        p1 = new JPanel(new GridLayout(1,1));
        p1.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        p1.add(resSP);
    private JTextField setObjSize (JTextField com) {
        Dimension d = new Dimension(80, 23);
        com.setPreferredSize(d);
        com.setMaximumSize(d);
        com.setMinimumSize(d);
        return com;
    private void createTable() {
        // Variables
        String[] colNames = {"Molecular Weight", "Length (cm)"};
        String[][] data;
        data = getLadder(new File("ladder.txt"));
        JTable table = new JTable(data, colNames);
        table.setPreferredScrollableViewportSize(new Dimension(220, 300));
        // Set 1st column uneditable
        JTextField tf = new JTextField();
        tf.setEditable(false);
        TableColumn wtCol = table.getColumnModel().getColumn(0);
        wtCol.setCellEditor(new DefaultCellEditor(tf));
        // Set the table width
        table.setColumnSelectionAllowed(false);
        table.getTableHeader().setResizingAllowed(false); //not allowing resizing of columns
        table.getTableHeader().setReorderingAllowed(false); //not allowing reordering of columns
        table.setRowSelectionAllowed(false);
        ladderSP = new JScrollPane(table);
    private void createResTable() {
        String[] colNames = {"Partition", "Molecular Weight"};
        String[][] data = new String[1][1];
        JTable table = new JTable(data, colNames);
        table.setPreferredScrollableViewportSize(new Dimension(220, 401));
        //table.setEnabled(false);
        table.setRowSelectionAllowed(false);
        table.getTableHeader().setResizingAllowed(false);
        table.getTableHeader().setReorderingAllowed(false);
        resSP = new JScrollPane(table);
        //resSP.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
    private String[][] getLadder(File file) {
        String line;
        String[] temp = new String[2];
        String[][] sA = new String[30][2];
        int x = 0;
        try {
            BufferedReader reader = new BufferedReader(
                    new FileReader(file));
            while ((line = reader.readLine()) != null) {
                if (line.length() > 0) {
                    temp = line.split("\\t");
                    sA[x][0] = temp[0];
                    sA[x][1] = temp[1];
                    x++;
        catch (IOException e) {
            System.out.println(e.getStackTrace());
            System.out.println(e.getMessage());
        String[][] tempArr = new String[x][2];
        for (int y=0; y<x; y++) {
            tempArr[y][0] = sA[y][0];
            tempArr[y][1] = sA[y][1];
        return tempArr;
    public static void main(String[] args) {
        Main black = new Main();
}There are labels and textfields and such but I've cut them out because it seems that having 2 JTables causes the problem to happen.
Am I doing something wrong?
Thanks.
Desmond

Answer 1

Oh damn I forgot about that, sorry.
Here is the code again (amended). I've added all the JComponents and made it independent of external sources.
Does anyone else have this problem or is it only me?
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.table.TableColumn;
public class Main {
    //Variable declarations
    private JFrame f;
    private JScrollPane ladderSP, resSP;
    private JPanel p0, p1;
    public Main() {
        createTable();
        createResTable();
        createPanelZero();
        createPanelOne();
        createAndShowGUI();
    private void createAndShowGUI() {
        f = new JFrame("Calculate MW");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setLayout(new GridLayout(1,2));
        f.setLocation(100, 100);
        f.add(p0);
        f.add(p1);
        f.pack();
        f.setResizable(false);
        f.setVisible(true);
    private void createPanelZero() {
        p0 = new JPanel(new GridBagLayout());
        p0.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        //set global gridbag constraints
        GridBagConstraints c = new GridBagConstraints();
        c.anchor = GridBagConstraints.EAST;
        c.insets = new Insets(1, 1, 0, 1);
        //length label
        JLabel lengthLabel = new JLabel("Length (cm): ");
        c.gridx = 0;
        c.gridy = 0;
        p0.add(lengthLabel, c);
        //length text field
        JTextField lengthTF = new JTextField();
        lengthTF = setObjSize(lengthTF);
        c.gridx = 1;
        c.gridy = 0;
        p0.add(lengthTF, c);
        //partition label
        JLabel partitionLabel = new JLabel("Number of partititons: ");
        c.gridx = 0;
        c.gridy = 1;
        p0.add(partitionLabel, c);
        //partition text field
        JTextField partitionTF = new JTextField();
        partitionTF = setObjSize(partitionTF);
        c.gridx = 1;
        c.gridy = 1;
        p0.add(partitionTF, c);
        //ladder label
        JLabel ladderLabel = new JLabel("Ladder: ");
        c.gridx = 0;
        c.gridy = 2;
        p0.add(ladderLabel, c);
        //ladder combo box
        JComboBox ladderCB = new JComboBox();
        Dimension d = new Dimension(80, 23);
        ladderCB.setPreferredSize(d);
        ladderCB.setMaximumSize(d);
        ladderCB.setMinimumSize(d);
        c.gridx = 1;
        c.gridy = 2;
        p0.add(ladderCB, c);
        //calculate button
        JButton button = new JButton("Calculate");
        button.addActionListener(new ActionListener() {
           public void actionPerformed(ActionEvent e) {
               //blah
        c.gridwidth = 2;
        c.fill = GridBagConstraints.HORIZONTAL;
        c.gridx = 0;
        c.gridy = 3;
        p0.add(button, c);
        //table
        c.gridx = 0;
        c.gridy = 4;
        p0.add(ladderSP, c);       
    private void createPanelOne() {
        p1 = new JPanel(new GridLayout(1,1));
        p1.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        p1.add(resSP);
    private JTextField setObjSize (JTextField com) {
        Dimension d = new Dimension(80, 23);
        com.setPreferredSize(d);
        com.setMaximumSize(d);
        com.setMinimumSize(d);
        return com;
    private void createTable() {
        // Variables
        String[] colNames = {"Molecular Weight", "Length (cm)"};
        String[][] data = {
            {"220", "2.1"},
            {"160", "2.7"},
            {"120", "3.4"},
            {"100", "3.75"},
            {"90", "3.95"}
        JTable table = new JTable(data, colNames);
        table.setPreferredScrollableViewportSize(new Dimension(220, 300));
        // Set 1st column uneditable
        JTextField tf = new JTextField();
        tf.setEditable(false);
        TableColumn wtCol = table.getColumnModel().getColumn(0);
        wtCol.setCellEditor(new DefaultCellEditor(tf));
        // Set the table width
        table.setColumnSelectionAllowed(false);
        table.getTableHeader().setResizingAllowed(false); //not allowing resizing of columns
        table.getTableHeader().setReorderingAllowed(false); //not allowing reordering of columns
        table.setRowSelectionAllowed(false);
        ladderSP = new JScrollPane(table);
    private void createResTable() {
        String[] colNames = {"Partition", "Molecular Weight"};
        String[][] data = new String[1][1];
        JTable table = new JTable(data, colNames);
        table.setPreferredScrollableViewportSize(new Dimension(220, 401));
        table.setEnabled(false);
        table.setRowSelectionAllowed(false);
        table.getTableHeader().setResizingAllowed(false);
        table.getTableHeader().setReorderingAllowed(false);
        resSP = new JScrollPane(table);
    public static void main(String[] args) {
        Main black = new Main();
}