title: How do I put multiple JPanels (3) in a JPanel Using JTabbedPane?
body: <p>I am trying to create a gui app using JTabbedPane to create 5 tabs connected to a database. Each tab contains a panel with 3 panels in it (one panel to hold JButtons another to hold JLabels and JTextFields and the last to hold a JTable. Each to the South, Center and North respectively). But after creating the tabs and its components, only the last tab displays and it displays incorrectly (it displays the JLabels, JTextfields and JButtons of all 5 tabs). If I remove all tabs and leave one it displays correctly but if more than one, it displays on the last tab. I don't know how to resolve it. Please help me.</p>
  
  <p>The source code is a bit lengthy so please bear with me and help me check it. If there is a better way to write the code please let me know.</p>
  
  <pre><code>import javax.swing.*;
  import java.awt.*;
  import java.awt.event.*;
  import java.awt.event.ActionListener;
  import java.sql.*;
  import java.util.Vector;
  
  public class Project_SalesDatabase extends JFrame {
  
  JTabbedPane tabbedPane = new JTabbedPane();
  ImageIcon icon = createImageIcon("images/middle.gif");
  JButton view = new JButton(" View ");
  JButton save = new JButton(" Save ");
  JButton addNew = new JButton(" Add New ");
  JButton exit = new JButton(" Exit Application ");
  JPanel displayBiscuitsPanel = new JPanel();
  JPanel displayCookingPanel = new JPanel();
  JPanel displayCustomersPanel = new JPanel();
  JPanel displayEmployeesPanel = new JPanel();
  JPanel displayProvisionsPanel = new JPanel();
  JPanel displayButton = new JPanel();
  JPanel displayContent = new JPanel((new GridLayout(10, 2)));
  JPanel displayTable = new JPanel(new GridLayout(1, 2));
  JTextField biscuitName = new JTextField();
  JTextField biscuitPrice = new JTextField();
  JTextField biscuitCompany = new JTextField();
  JTextField quantityOfBiscuitsBought = new JTextField();
  JTextField quantityOfBiscuitsSold = new JTextField();
  JTextField quantityInStock = new JTextField();
  JTextField itemName = new JTextField();
  JTextField itemPrice = new JTextField();
  JTextField itemType = new JTextField();
  JTextField quantityOfitemsBought = new JTextField();
  JTextField quantityOfitemsSold = new JTextField();
  JTextField firstName = new JTextField();
  JTextField lastName = new JTextField();
  JTextField customerAttendant = new JTextField();
  JTextField customerAttendantPosition = new JTextField();
  JTextField isCustomerADebtor = new JTextField();
  JTextField orderNumber = new JTextField();
  JTextField debtAmount = new JTextField();
  JTextField address = new JTextField();
  JTextField phoneNumber = new JTextField();
  JTextField position = new JTextField();
  JTextField age = new JTextField();
  JTextField salary = new JTextField();
  JTextField nextOfKin = new JTextField();
  JTextField relationshipWithNextOfKin = new JTextField();
  JTextField nextOfKinPhoneNumber = new JTextField();
  JTextField itemCompany = new JTextField();
  
  public static void main(String[] args) {
      Project_SalesDatabase mainFrame = new Project_SalesDatabase();
      mainFrame.setLocationRelativeTo(null);
      mainFrame.setVisible(true);
      mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
  
  public Project_SalesDatabase() {
  
      setTitle(" Database App ");
      setSize(1000, 500);
  
      // Create the tab pages
      biscuitsTable();
      cookingIngredientsTable();
      customersTable();
      employeesTable();
      provisionsTable();
  
      JPanel topPanel = new JPanel();
      topPanel.setLayout(new GridLayout(1, 3));
      getContentPane().add(topPanel);
      topPanel.add(tabbedPane, BorderLayout.CENTER);
  
  
      // Create tabs in tabbedPane
      tabbedPane.addTab("Biscuits Database", icon, displayBiscuitsPanel,
              "Allows you to view or Enter Data into the Biscuits Database");
  
      tabbedPane.addTab("Cooking Ingredients Database", icon, displayCookingPanel,
              "Allows you to view or Enter Data into the Cooking Ingredients Database");
  
      tabbedPane.addTab("Customers Database", icon, displayCustomersPanel,
              "Allows you to view or Enter Data into the Customers Database");
  
      tabbedPane.addTab("Employees Database", icon, displayEmployeesPanel,
              "Allows you to view or Enter Data into the Employees Database");
  
      tabbedPane.addTab("Provisions Database", icon, displayProvisionsPanel,
              "Allows you to view or Enter Data into the Provisions Database");
  
      //Enable scrolling in tabs.
      tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
  }
  
  public static ImageIcon createImageIcon(String path) {
      java.net.URL imgURL = Project_SalesDatabase.class.getResource(path);
      if (imgURL != null) {
          return new ImageIcon(imgURL);
      } else {
          System.err.println("Couldn't find file: " + path);
          return null;
      }
  }
  
  public final void biscuitsTable() {
      displayBiscuitsPanel.setLayout(new BorderLayout());
      displayBiscuitsPanel.add(displayContent, BorderLayout.CENTER);
      displayBiscuitsPanel.add(displayButton, BorderLayout.SOUTH);
      displayBiscuitsPanel.add(displayTable, BorderLayout.NORTH);
  
      displayContent.add(new JLabel("Biscuit Name"));
      displayContent.add(biscuitName);
      displayContent.add(new JLabel("Biscuit Price"));
      displayContent.add(biscuitPrice);
      displayContent.add(new JLabel("Biscuit Company"));
      displayContent.add(biscuitCompany);
      displayContent.add(new JLabel("Quantity Of Biscuits Bought"));
      displayContent.add(quantityOfBiscuitsBought);
      displayContent.add(new JLabel("Quantity Of Biscuits Sold"));
      displayContent.add(quantityOfBiscuitsSold);
      displayContent.add(new JLabel("Quantity In Stock"));
      displayContent.add(quantityInStock);
  
      displayButton.add(addNew);
      displayButton.add(save);
      displayButton.add(view);
      displayButton.add(exit);
  
      view.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
  
              String db_url = "jdbc:odbc:ProjectSalesDatabase";
              String username = "";
              String password = "";
              Connection con = null;
  
              try {
                  Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                  con = DriverManager.getConnection(db_url, username, password);
              } catch (ClassNotFoundException | SQLException f) {
                  JOptionPane.showMessageDialog(rootPane, f.getMessage());
              }
  
              Statement state = null;
              ResultSet set = null;
  
              try {
  
                  String Query = "SELECT * FROM Biscuits";
                  state = con.createStatement();
                  set = state.executeQuery(Query);
  
                  boolean nextrec = set.next();
                  if (!nextrec) {
                      JOptionPane.showMessageDialog(rootPane, "No Record");
                  } else {
                      Vector col = new Vector();
                      Vector row = new Vector();
  
                      ResultSetMetaData rsm = set.getMetaData();
  
                      for (int x = 1; x &lt;= rsm.getColumnCount(); x++) {
                          col.addElement(rsm.getColumnName(x));
                      }
                      do {
                          row.addElement(getNextRow(set, rsm));
                      } while (set.next());
  
                      JTable tab = new JTable(row, col);
                      displayContent.removeAll();
                      displayTable.removeAll();
                      displayTable.add(new JScrollPane(tab), BorderLayout.CENTER);
  
                      validate();
                  }
                  state.close();
              } catch (SQLException sql) {
                  JOptionPane.showMessageDialog(rootPane, sql.getMessage());
              }
          }
      });
  
      save.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
  
              try {
                  String Query = "INSERT INTO Biscuits VALUES ('" + biscuitName.getText() + "',"
                          + "          '" + biscuitPrice.getText() + "',"
                          + "          '" + biscuitCompany.getText() + "',"
                          + "          '" + quantityOfBiscuitsBought.getText() + "',"
                          + "          '" + quantityOfBiscuitsSold.getText() + "',"
                          + "          '" + quantityInStock.getText() + "')";
  
                  String db_url = "jdbc:odbc:ProjectSalesDatabase";
                  String username = "";
                  String password = "";
                  Connection con = null;
                  try {
                      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                      con = DriverManager.getConnection(db_url, username, password);
                  } catch (ClassNotFoundException | SQLException f) {
  
                      JOptionPane.showMessageDialog(rootPane, f.getMessage());
                  }
                  Statement state = con.createStatement();
                  int rep = state.executeUpdate(Query);
                  if (rep == 0) {
                      JOptionPane.showMessageDialog(rootPane, "No Data Saved");
                  } else {
                      JOptionPane.showMessageDialog(rootPane, "Data Saved");
                  }
              } catch (SQLException sqle) {
                  sqle.getMessage();
              }
          }
      });
  
      addNew.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
  
              try {
  
                  biscuitName.setText("");
                  biscuitPrice.setText("");
                  biscuitCompany.setText("");
                  quantityOfBiscuitsBought.setText("");
                  quantityOfBiscuitsSold.setText("");
                  quantityInStock.setText("");
  
                  displayTable.removeAll();
                  displayContent.removeAll();
  
                  displayContent.add(new JLabel("Biscuit Name"));
                  displayContent.add(biscuitName);
                  displayContent.add(new JLabel("Biscuit Price"));
                  displayContent.add(biscuitPrice);
                  displayContent.add(new JLabel("Biscuit Company"));
                  displayContent.add(biscuitCompany);
                  displayContent.add(new JLabel("Quantity Of Biscuits Bought"));
                  displayContent.add(quantityOfBiscuitsBought);
                  displayContent.add(new JLabel("Quantity Of Biscuits Sold"));
                  displayContent.add(quantityOfBiscuitsSold);
                  displayContent.add(new JLabel("Quantity In Stock"));
                  displayContent.add(quantityInStock);
  
                  validate();
  
              } catch (Exception f) {
                  f.getMessage();
              }
          }
      });
  
      exit.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
              System.exit(0);
          }
      });
  }
  
  public final void cookingIngredientsTable() {
      displayCookingPanel.setLayout(new BorderLayout());
      displayCookingPanel.add(displayContent, BorderLayout.CENTER);
      displayCookingPanel.add(displayButton, BorderLayout.SOUTH);
      displayCookingPanel.add(displayTable, BorderLayout.NORTH);
  
      displayContent.add(new JLabel("Item Name"));
      displayContent.add(itemName);
      displayContent.add(new JLabel("Item Price"));
      displayContent.add(itemPrice);
      displayContent.add(new JLabel("Item Type"));
      displayContent.add(itemType);
      displayContent.add(new JLabel("Quantity Of Items Bought"));
      displayContent.add(quantityOfitemsBought);
      displayContent.add(new JLabel("Quantity Of Items Sold"));
      displayContent.add(quantityOfitemsSold);
      displayContent.add(new JLabel("Quantity In Stock"));
      displayContent.add(quantityInStock);
  
      displayButton.add(addNew);
      displayButton.add(save);
      displayButton.add(view);
      displayButton.add(exit);
  
      view.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
              String db_url = "jdbc:odbc:ProjectSalesDatabase";
              String username = "";
              String password = "";
              Connection con = null;
              try {
                  Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                  con = DriverManager.getConnection(db_url, username, password);
              } catch (ClassNotFoundException | SQLException f) {
                  JOptionPane.showMessageDialog(rootPane, f.getMessage());
              }
  
              Statement state = null;
              ResultSet set = null;
  
              try {
  
                  String Query = "SELECT * FROM CookingIngredients";
                  state = con.createStatement();
                  set = state.executeQuery(Query);
  
                  boolean nextrec = set.next();
                  if (!nextrec) {
                      JOptionPane.showMessageDialog(rootPane, "No Record");
                  } else {
                      Vector col = new Vector();
                      Vector row = new Vector();
  
                      ResultSetMetaData rsm = set.getMetaData();
  
                      for (int x = 1; x &lt;= rsm.getColumnCount(); x++) {
                          col.addElement(rsm.getColumnName(x));
                      }
                      do {
                          row.addElement(getNextRow(set, rsm));
                      } while (set.next());
                      JTable tab = new JTable(row, col);
                      displayContent.removeAll();
                      displayTable.removeAll();
                      displayTable.add(new JScrollPane(tab), BorderLayout.CENTER);
                      validate();
                  }
                  state.close();
  
              } catch (SQLException sql) {
                  JOptionPane.showMessageDialog(rootPane, sql.getMessage());
              }
          }
      });
  
      save.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
  
              try {
                  String Query = "INSERT INTO CookingIngredients VALUES ('" + itemName.getText() + "',"
                          + "          '" + itemPrice.getText() + "',"
                          + "          '" + itemType.getText() + "',"
                          + "          '" + quantityOfitemsBought.getText() + "',"
                          + "          '" + quantityOfitemsSold.getText() + "',"
                          + "          '" + quantityInStock.getText() + "')";
  
                  String db_url = "jdbc:odbc:ProjectSalesDatabase";
                  String username = "";
                  String password = "";
                  Connection con = null;
                  try {
                      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                      con = DriverManager.getConnection(db_url, username, password);
                  } catch (ClassNotFoundException | SQLException f) {
                      JOptionPane.showMessageDialog(rootPane, f.getMessage());
                  }
                  Statement state = con.createStatement();
                  int rep = state.executeUpdate(Query);
                  if (rep == 0) {
                      JOptionPane.showMessageDialog(rootPane, "No Data Saved");
                  } else {
                      JOptionPane.showMessageDialog(rootPane, "Data Saved");
                  }
              } catch (SQLException sqle) {
                  sqle.getMessage();
              }
          }
      });
  
      addNew.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
  
              try {
  
                  itemName.setText("");
                  itemPrice.setText("");
                  itemType.setText("");
                  quantityOfitemsBought.setText("");
                  quantityOfBiscuitsSold.setText("");
                  quantityOfitemsSold.setText("");
                  quantityInStock.setText("");
  
                  displayTable.removeAll();
                  displayContent.removeAll();
  
                  displayContent.add(new JLabel("Item Name"));
                  displayContent.add(itemName);
                  displayContent.add(new JLabel("Item Price"));
                  displayContent.add(itemPrice);
                  displayContent.add(new JLabel("Item Type"));
                  displayContent.add(itemType);
                  displayContent.add(new JLabel("Quantity Of Items Bought"));
                  displayContent.add(quantityOfitemsBought);
                  displayContent.add(new JLabel("Quantity Of Items Sold"));
                  displayContent.add(quantityOfitemsSold);
                  displayContent.add(new JLabel("Quantity In Stock"));
                  displayContent.add(quantityInStock);
  
                  validate();
  
              } catch (Exception f) {
                  f.getMessage();
              }
          }
      });
  }
  
  public final void customersTable() {
      displayCustomersPanel.setLayout(new BorderLayout());
      displayCustomersPanel.add(displayContent, BorderLayout.CENTER);
      displayCustomersPanel.add(displayButton, BorderLayout.SOUTH);
      displayCustomersPanel.add(displayTable, BorderLayout.NORTH);
  
      displayContent.add(new JLabel("First Name"));
      displayContent.add(firstName);
      displayContent.add(new JLabel("Last Name"));
      displayContent.add(lastName);
      displayContent.add(new JLabel("Customer Attendant"));
      displayContent.add(customerAttendant);
      displayContent.add(new JLabel("Customer Attendant's Position"));
      displayContent.add(customerAttendantPosition);
      displayContent.add(new JLabel("Is This Customer A Debtor?"));
      displayContent.add(isCustomerADebtor);
      displayContent.add(new JLabel("Order Number"));
      displayContent.add(orderNumber);
      displayContent.add(new JLabel("Debt Amount"));
      displayContent.add(debtAmount);
      displayContent.add(new JLabel("Customer's Address"));
      displayContent.add(address);
      displayContent.add(new JLabel("Customer's Phone Number"));
      displayContent.add(phoneNumber);
  
      displayButton.add(addNew);
      displayButton.add(save);
      displayButton.add(view);
      displayButton.add(exit);
  
      //button actions same as other methods. Removed it because of body character limits
  }
  
  public final void employeesTable() {
      displayEmployeesPanel.setLayout(new BorderLayout());
      displayEmployeesPanel.add(displayContent, BorderLayout.CENTER);
      displayEmployeesPanel.add(displayButton, BorderLayout.SOUTH);
      displayEmployeesPanel.add(displayTable, BorderLayout.NORTH);
  
      displayContent.add(new JLabel("First Name"));
      displayContent.add(firstName);
      displayContent.add(new JLabel("Last Name"));
      displayContent.add(lastName);
      displayContent.add(new JLabel("Position"));
      displayContent.add(position);
      displayContent.add(new JLabel("Age"));
      displayContent.add(age);
      displayContent.add(new JLabel("Salary"));
      displayContent.add(salary);
      displayContent.add(new JLabel("Employees's Address"));
      displayContent.add(address);
      displayContent.add(new JLabel("Employees's Phone Number(s)"));
      displayContent.add(phoneNumber);
      displayContent.add(new JLabel("Next of Kin"));
      displayContent.add(nextOfKin);
      displayContent.add(new JLabel("Relationship With Next of Kin"));
      displayContent.add(relationshipWithNextOfKin);
      displayContent.add(new JLabel("Next of Kin's Phone Number(s)"));
      displayContent.add(nextOfKinPhoneNumber);
  
      displayButton.add(addNew);
      displayButton.add(save);
      displayButton.add(view);
      displayButton.add(exit);
  
      //button actions same as other methods. Removed it because of body character limits
  }
  
  public final void provisionsTable() {
      displayProvisionsPanel.setLayout(new BorderLayout());
      displayProvisionsPanel.add(displayContent, BorderLayout.CENTER);
      displayProvisionsPanel.add(displayButton, BorderLayout.SOUTH);
      displayProvisionsPanel.add(displayTable, BorderLayout.NORTH);
  
      displayContent.add(new JLabel("Item Name"));
      displayContent.add(itemName);
      displayContent.add(new JLabel("Item Price"));
      displayContent.add(itemPrice);
      displayContent.add(new JLabel("Item Company"));
      displayContent.add(itemCompany);
      displayContent.add(new JLabel("Quantity Of Items Bought"));
      displayContent.add(quantityOfitemsBought);
      displayContent.add(new JLabel("Quantity Of Items Sold"));
      displayContent.add(quantityOfitemsSold);
      displayContent.add(new JLabel("Quantity In Stock"));
      displayContent.add(quantityInStock);
  
      displayButton.add(addNew);
      displayButton.add(save);
      displayButton.add(view);
      displayButton.add(exit);
  
      view.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
              String db_url = "jdbc:odbc:ProjectSalesDatabase";
              String username = "";
              String password = "";
              Connection con = null;
              try {
                  Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                  con = DriverManager.getConnection(db_url, username, password);
              } catch (ClassNotFoundException | SQLException f) {
                  JOptionPane.showMessageDialog(rootPane, f.getMessage());
              }
  
              Statement state = null;
              ResultSet set = null;
  
              try {
  
                  String Query = "SELECT * FROM Provisions";
                  state = con.createStatement();
                  set = state.executeQuery(Query);
  
                  boolean nextrec = set.next();
                  if (!nextrec) {
                      JOptionPane.showMessageDialog(rootPane, "No Record");
                  } else {
                      Vector col = new Vector();
                      Vector row = new Vector();
  
                      ResultSetMetaData rsm = set.getMetaData();
  
                      for (int x = 1; x &lt;= rsm.getColumnCount(); x++) {
                          col.addElement(rsm.getColumnName(x));
                      }
                      do {
                          row.addElement(getNextRow(set, rsm));
                      } while (set.next());
  
                      JTable tab = new JTable(row, col);
                      displayContent.removeAll();
                      displayTable.removeAll();
                      displayTable.add(new JScrollPane(tab), BorderLayout.CENTER);
  
                      validate();
                  }
                  state.close();
              } catch (SQLException sql) {
                  JOptionPane.showMessageDialog(rootPane, sql.getMessage());
              }
          }
      });
  
      save.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
  
              try {
                  String Query = "INSERT INTO Provisions VALUES ('" + itemName.getText() + "',"
                          + "          '" + itemPrice.getText() + "',"
                          + "          '" + itemCompany.getText() + "',"
                          + "          '" + quantityOfitemsBought.getText() + "',"
                          + "          '" + quantityOfitemsSold.getText() + "',"
                          + "          '" + quantityInStock.getText() + "')";
  
                  String db_url = "jdbc:odbc:ProjectSalesDatabase";
                  String username = "";
                  String password = "";
                  Connection con = null;
                  try {
                      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                      con = DriverManager.getConnection(db_url, username, password);
                  } catch (ClassNotFoundException | SQLException f) {
                      JOptionPane.showMessageDialog(rootPane, f.getMessage());
                  }
                  Statement state = con.createStatement();
                  int rep = state.executeUpdate(Query);
                  if (rep == 0) {
                      JOptionPane.showMessageDialog(rootPane, "No Data Saved");
                  } else {
                      JOptionPane.showMessageDialog(rootPane, "Data Saved");
                  }
              } catch (SQLException sqle) {
                  sqle.getMessage();
              }
          }
      });
  
      addNew.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
  
              try {
  
                  itemName.setText("");
                  itemPrice.setText("");
                  itemCompany.setText("");
                  quantityOfitemsBought.setText("");
                  quantityOfitemsSold.setText("");
                  quantityInStock.setText("");
  
                  displayTable.removeAll();
                  displayContent.removeAll();
  
                  displayContent.add(new JLabel("Item Name"));
                  displayContent.add(itemName);
                  displayContent.add(new JLabel("Item Price"));
                  displayContent.add(itemPrice);
                  displayContent.add(new JLabel("Item Company"));
                  displayContent.add(itemCompany);
                  displayContent.add(new JLabel("Quantity Of Items Bought"));
                  displayContent.add(quantityOfitemsBought);
                  displayContent.add(new JLabel("Quantity Of Items Sold"));
                  displayContent.add(quantityOfitemsSold);
                  displayContent.add(new JLabel("Quantity In Stock"));
                  displayContent.add(quantityInStock);
  
                  validate();
  
              } catch (Exception f) {
                  f.getMessage();
              }
          }
      });
  }
  
  Vector getNextRow(ResultSet set, ResultSetMetaData rsm) {
      Vector currentRow = new Vector();
      try {
          for (int x = 1; x &lt;= rsm.getColumnCount(); x++) {
              switch (rsm.getColumnType(x)) {
                  case Types.VARCHAR:
                      currentRow.addElement(set.getString(x));
                      break;
                  case Types.INTEGER:
                      currentRow.addElement(new Long(set.getLong(x)));
                      break;
                  default:
                      System.out.println("No column type known");
                      break;
              }
          }
      } catch (SQLException sqle) {
          sqle.getMessage();
      }
      return currentRow;
  }
  }
  </code></pre>
  
  <p>I don't know why its not working correctly. Please if anybody can try and compile/run it to see what I'm saying. Thanks.</p>