Table Header is not displaying on Java Swing

Question

I add full code Here. Check the following code which I am using to create the table. While executing the program, Values are displaying clearly, but the header is not displaying.

public class Table extends JFrame implements ActionListener {

    JFrame f;
    JPanel p1;
    JPanel jPanel1;
    JTable jTable1;

    Table() {

        f=new JFrame("Home123");
        f.setSize(getMaximumSize());
        f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setLayout(null);

        p1=new JPanel();
        p1.setBackground(Color.red);
        p1.setVisible(true);
        p1.setLayout(null);
        f.add(p1);

        String[] headers = {"First Name","Last Name","Age"};
        Object[][] data = {
        {"Kathy", "Smith",new Integer(25)},
        };  

         jTable1 =new JTable(data, headers);
         JScrollPane scrollPane = new JScrollPane(jTable1);

         p1.add(jTable1);

         p1.setBounds(200, 100, 500, 500);
         jTable1.setBounds(70,250, 375,80);
    }

    public static void main(String[] args) {
                new Table();
    }
}

read Oracle tutorial - How to use Tables for working code examples — mKorbel, Aug 22 '14 at 06:03
Welcome to SO. May be this [SO-link](http://stackoverflow.com/questions/2320812/jtable-wont-show-column-headers) help you. — Mandar Pandit, Aug 22 '14 at 06:50
You code does not compile. See [How to create a Minimal, Complete, and Verifiable example](http://stackoverflow.com/help/mcve). — DavidPostill, Aug 22 '14 at 07:32

Kishan Bheemajiyani · Accepted Answer · 2014-08-22T08:47:22.563

4

public class TableExample extends JFrame implements ActionListener {

        JFrame f;
        JPanel p1;
        JPanel jPanel1;
        JTable jTable1;

        TableExample() {

            JFrame f;
        JPanel p1;
        JPanel jPanel1;
        JTable jTable1;

        f = new JFrame("Home123");
        f.setSize(getMaximumSize());

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        p1 = new JPanel();
        p1.setBackground(Color.red);
        p1.setLayout(new BorderLayout());
        f.add(p1);

        String[] headers = {"First Name", "Last Name", "Age"};
        Object[][] data = {
            {"Kathy", "Smith", new Integer(25)},};

        jTable1 = new JTable(data, headers);
        JScrollPane scrollPane = new JScrollPane(jTable1);
        scrollPane.setSize(500,500);
        jTable1.setSize(500,500);
        p1.add(scrollPane);
        f.pack();
        f.setVisible(true);
        }

    public static void main(String[] args) {
            EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new TableExample();
            }
        });
        }

        @Override
            public void actionPerformed(ActionEvent e) {
            try {
                System.out.println("");

            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

try this its working and showing all thing that u need. enter image description here

edited Aug 22 '14 at 08:47

answered Aug 22 '14 at 07:36

Kishan Bheemajiyani

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in mine case its working dont know what is the prob with your way of doing it. wait. – Kishan Bheemajiyani Aug 22 '14 at 07:45
look the screen shot what i am getting. – Kishan Bheemajiyani Aug 22 '14 at 07:49
@mKorbel what u trying to say? – Kishan Bheemajiyani Aug 22 '14 at 07:51
three important mistakes, isn't it :-) – mKorbel Aug 22 '14 at 07:52
@Krishna.. If i use p1.setVisible(true);.. Table displaying, otherwise it not displaying... – Shaji SS Aug 22 '14 at 08:18
@Krishna see my answer here, I'm hope that explain more – mKorbel Aug 22 '14 at 08:21
@ShajiSS according to me u adding main panel as p1 so if u add it in content pane of main frame then and then it will show content na isnt it? – Kishan Bheemajiyani Aug 22 '14 at 08:28
@mKorbel okey i got your point brother. that u have run code in Thread and ya u have maintain important thing that is about panel about not need to set it visible it will be by default. – Kishan Bheemajiyani Aug 22 '14 at 08:32

score 4 · Answer 2 · answered Aug 22 '14 at 08:20

to @Sergiy Medvynskyy and @Krishna about 1. f.setVisible(true); 2. Initial Thread 3. p1.setVisible(true);

e.g.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class Table /*extends JFrame implements ActionListener*/ {

    private JFrame f;
    private JPanel p1;
    private JPanel jPanel1;
    private JTable jTable1;

    public Table() {
        p1 = new JPanel();
        p1.setBackground(Color.red);
        p1.setLayout(new BorderLayout(5, 5));        
        String[] headers = {"First Name", "Last Name", "Age"};
        Object[][] data = {
            {"Kathy", "Smith", new Integer(25)},};        
        jTable1 = new JTable(data, headers);
        JScrollPane scrollPane = new JScrollPane(jTable1);
        jTable1.setPreferredScrollableViewportSize(jTable1.getPreferredSize());
        p1.add(scrollPane);        
        f = new JFrame("Home123");
        //f.setSize(getMaximumSize());
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(p1);
        f.pack();
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Table();
            }
        });
    }
}

Yeah, i was too lazy to check whether the code can be at least compiled — Sergiy Medvynskyy, Aug 22 '14 at 08:24
@Sergiy Medvynskyy reason why I'm leaving to answer and questions here, hmmmm and my endless lazyness is top one of reasons — mKorbel, Aug 22 '14 at 08:27

score 1 · Answer 3 · answered Aug 22 '14 at 07:27

You're adding the table directly to the frame's panel, instead of adding the scroll pane wrapping the table, and displaying the headers.

Change

p1.add(jTable1);

to

p1.add(scrollPane);

And definitely stop using a null layout and setting bounds. Learn using layout managers.

Sergiy Medvynskyy · Answer 4 · 2014-08-22T08:18:52.263

You should add scroll pane to panel

import java.awt.BorderLayout;
import java.awt.Color;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class Table extends JFrame {
    JFrame f;
    JPanel p1;
    JPanel jPanel1;
    JTable jTable1;

    Table() {

        p1=new JPanel();
        p1.setBackground(Color.red);
        p1.setVisible(true);
        p1.setLayout(new BorderLayout());

        final String[] headers = {"First Name","Last Name","Age"};
        final Object[][] data = {
                {"Kathy", "Smith",new Integer(25)},
        };

        jTable1 =new JTable(data, headers);
        final JScrollPane scrollPane = new JScrollPane(jTable1);

        p1.add(scrollPane);

        f=new JFrame("Home123");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(p1);
        f.pack();
        f.setVisible(true);
    }
    public static void main(String[] args) {
        new Table();
    }
}

P.S. Never use null-layout.

Table Header is not displaying on Java Swing

4 Answers4