Centring items using SpringLayout

Question

I'm writing a dictionary program that uses Spring Layout to position things in exactly the way I want them.
However, some elements, such as the results table, or the masses of buttons to perform searches, don't stay centred and I don't know how to do this using Spring Layout.
Snippets of my code below. Centred Dictionary Window just sets the size, background colour, etc. There are 5 of each element (eg "Not" ComboBoxes, etc) except Operator ComboBoxes, of which there are 4. and yeah I understand that I can use 'object arrays' to shorten my code and avoid duplication but I've not worked out exactly how to do that yet >.<
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.lang.*;
import java.io.*;
public class searchWindowFrame extends CentredDictionaryWindow {
//Title image
          JLabel searchImage = new JLabel(new ImageIcon("resources/SearchImage.jpg"));
          boxFont = new Font("Tahoma", Font.PLAIN, 12);
          //First 'Not' ComboBox
          String[] notItems = { "", "NOT" };
          notCombo = new JComboBox(notItems);
          notCombo.setPreferredSize(new Dimension(95, 40));
          notCombo.setBackground(new Color(241, 239, 240));
          notCombo.setForeground(new Color(93, 58, 64));
          notCombo.setFont(boxFont);
          notCombo.setEnabled(true);
          //First 'Dictionary Type' ComboBox
          String[] dictTypeItems = { "<Dictionary Type>", "Orthography", "Pronunciation" };
          dictTypeCombo = new JComboBox(dictTypeItems);
          dictTypeCombo.setPreferredSize(new Dimension(135, 40));
          dictTypeCombo.setBackground(new Color(241, 239, 240));
          dictTypeCombo.setForeground(new Color(93, 58, 64));
          dictTypeCombo.setFont(boxFont);
          dictTypeCombo.setEnabled(true);
          //First 'Search Type' ComboBox
          String[] searchTypeItems = { "<Search Type>", "Contains", "Starts With",
               "Ends With", "Minimal Pairs" };
          searchTypeCombo = new JComboBox(searchTypeItems);
          searchTypeCombo.setPreferredSize(new Dimension(125, 40));
          searchTypeCombo.setBackground(new Color(241, 239, 240));
          searchTypeCombo.setForeground(new Color(93, 58, 64));
          searchTypeCombo.setFont(boxFont);
          searchTypeCombo.setEnabled(true);
          //First 'Query' TextField
          searchTermField = new JTextField("<Query>", 10);
          searchTermField.setBorder(new EtchedBorder(EtchedBorder.LOWERED));
          searchTermField.setPreferredSize(new Dimension(100, 40));
          searchTermField.setBackground(new Color(249, 249, 249));
          searchTermField.setForeground(new Color(93, 58, 64));
          searchTermField.setFont(boxFont);
          //First 'Operator' ComboBox
          String[] operatorItems = { "", "AND", "OR" };
          operatorCombo = new JComboBox(operatorItems);
          operatorCombo.setPreferredSize(new Dimension(95, 40));
          operatorCombo.setBackground(new Color(241, 239, 240));
          operatorCombo.setForeground(new Color(93, 58, 64));
          operatorCombo.setFont(boxFont);
          operatorCombo.setEnabled(true);
//Panel containing Not Combo Boxes
          firstQueryPanel = new JPanel();
          firstQueryPanel.setLayout(new GridLayout(5, 0, 10, 10));
          firstQueryPanel.setBackground(new Color(241, 239, 240));
          firstQueryPanel.setBorder(new EmptyBorder(10, 10, 0, 0));
          firstQueryPanel.add(notCombo);
          firstQueryPanel.add(notComboTwo);
          firstQueryPanel.add(notComboThree);
          firstQueryPanel.add(notComboFour);
          firstQueryPanel.add(notComboFive);
          //Panel containing Dictionary Type Combo Boxes
          secondQueryPanel = new JPanel();
          secondQueryPanel.setLayout(new GridLayout(5, 0, 10, 10));
          secondQueryPanel.setBackground(new Color(241, 239, 240));
          secondQueryPanel.setBorder(new EmptyBorder(10, 0, 0, 0));
          secondQueryPanel.add(dictTypeCombo);
          secondQueryPanel.add(dictTypeComboTwo);
          secondQueryPanel.add(dictTypeComboThree);
          secondQueryPanel.add(dictTypeComboFour);
          secondQueryPanel.add(dictTypeComboFive);
          //Panel containing Search Type Combo Boxes
          thirdQueryPanel = new JPanel();
          thirdQueryPanel.setLayout(new GridLayout(5, 0, 10, 10));
          thirdQueryPanel.setBackground(new Color(241, 239, 240));
          thirdQueryPanel.setBorder(new EmptyBorder(10, 0, 0, 0));
          thirdQueryPanel.add(searchTypeCombo);
          thirdQueryPanel.add(searchTypeComboTwo);
          thirdQueryPanel.add(searchTypeComboThree);
          thirdQueryPanel.add(searchTypeComboFour);
          thirdQueryPanel.add(searchTypeComboFive);
          //Panel containing Query Text Fields
          fourthQueryPanel = new JPanel();
          fourthQueryPanel.setLayout(new GridLayout(5, 0, 10, 10));
          fourthQueryPanel.setBackground(new Color(241, 239, 240));
          fourthQueryPanel.setBorder(new EmptyBorder(10, 0, 0, 0));
          fourthQueryPanel.add(searchTermField);
          fourthQueryPanel.add(searchTermFieldTwo);
          fourthQueryPanel.add(searchTermFieldThree);
          fourthQueryPanel.add(searchTermFieldFour);
          fourthQueryPanel.add(searchTermFieldFive);
          //Panel containing Operator Combo Boxes
          fifthQueryPanel = new JPanel();
          fifthQueryPanel.setLayout(new GridLayout(4,0,10,10));
          fifthQueryPanel.setBackground(new Color(241, 239, 240));
          fifthQueryPanel.setBorder(new EmptyBorder(10, 0, 0, 10));
          fifthQueryPanel.add(operatorCombo);
          fifthQueryPanel.add(operatorComboTwo);
          fifthQueryPanel.add(operatorComboThree);
          fifthQueryPanel.add(operatorComboFour);
          //Search button
          searchButton = new JButton("Search");
          searchButton.setFont(boxFont);
          searchButton.setBackground(new Color(249, 249, 249));
          searchButton.setForeground(new Color(93, 58, 64));
          searchButton.setToolTipText("Search with the set parameters");
          searchButton.setPreferredSize(new Dimension(100, 40));
          searchButton.setFocusPainted(false);
          //Back button
          backButton = new JButton("< Back");
          backButton.setFont(boxFont);
          backButton.setBackground(new Color(249, 249, 249));
          backButton.setForeground(new Color(93, 58, 64));
          backButton.setPreferredSize(new Dimension(100, 40));
          backButton.setFocusPainted(false);
          //Exit button
          exitButton = new JButton("Exit");
          exitButton.setFont(boxFont);
          exitButton.setBackground(new Color(249, 249, 249));
          exitButton.setForeground(new Color(93, 58, 64));
          exitButton.setPreferredSize(new Dimension(100, 40));
          exitButton.setFocusPainted(false);
layout = new SpringLayout();
          getContentPane().setLayout(layout);
          layout.putConstraint(SpringLayout.NORTH, searchImage, 10, SpringLayout.NORTH, getContentPane());
          layout.putConstraint(SpringLayout.EAST, searchImage, 0, SpringLayout.EAST, getContentPane());
          layout.putConstraint(SpringLayout.NORTH, firstQueryPanel, 10, SpringLayout.SOUTH, searchImage);
          layout.putConstraint(SpringLayout.WEST, secondQueryPanel, 10, SpringLayout.EAST, firstQueryPanel);
          layout.putConstraint(SpringLayout.NORTH, secondQueryPanel, 10, SpringLayout.SOUTH, searchImage);
          layout.putConstraint(SpringLayout.WEST, thirdQueryPanel, 10, SpringLayout.EAST, secondQueryPanel);
          layout.putConstraint(SpringLayout.NORTH, thirdQueryPanel, 10, SpringLayout.SOUTH, searchImage);
          layout.putConstraint(SpringLayout.WEST, fourthQueryPanel, 10, SpringLayout.EAST, thirdQueryPanel);
          layout.putConstraint(SpringLayout.NORTH, fourthQueryPanel, 10, SpringLayout.SOUTH, searchImage);
          layout.putConstraint(SpringLayout.WEST, fifthQueryPanel, 10, SpringLayout.EAST, fourthQueryPanel);
          layout.putConstraint(SpringLayout.NORTH, fifthQueryPanel, 10, SpringLayout.SOUTH, searchImage);
          layout.putConstraint(SpringLayout.SOUTH, backButton, -10, SpringLayout.SOUTH, getContentPane());
          layout.putConstraint(SpringLayout.WEST, backButton, 10, SpringLayout.WEST, getContentPane());
          layout.putConstraint(SpringLayout.WEST, exitButton, 10, SpringLayout.EAST, backButton);
          layout.putConstraint(SpringLayout.SOUTH, exitButton, -10, SpringLayout.SOUTH, getContentPane());
          layout.putConstraint(SpringLayout.EAST, helpButton, -10, SpringLayout.WEST, searchButton);
          layout.putConstraint(SpringLayout.SOUTH, helpButton, -10, SpringLayout.SOUTH, getContentPane());
          layout.putConstraint(SpringLayout.SOUTH, searchButton, -10, SpringLayout.SOUTH, getContentPane());
          layout.putConstraint(SpringLayout.EAST, searchButton, -10, SpringLayout.EAST, getContentPane());
          getContentPane().setBackground(new Color(241, 239, 240));
          getContentPane().add(searchImage);
          getContentPane().add(firstQueryPanel);
          getContentPane().add(secondQueryPanel);
          getContentPane().add(thirdQueryPanel);
          getContentPane().add(fourthQueryPanel);
          getContentPane().add(fifthQueryPanel);
          getContentPane().add(backButton);
          getContentPane().add(exitButton);
          getContentPane().add(searchButton);
...

Answer 1

-__- On searchWindowFrame I want to centre all 24 input components. On resultsFrame I want to centre the scroll pane containing the JTable.
To say I rewrote most of the program I had to completely redo this to get it to run, nor can I even use them all because that's 'too much', so that was fun.
Like I said, I can centre things, just when the window resizes, it doesn't move with it.
Originally the window is set to the right size, so everything is in its correct place.
import javax.swing.*;
import java.awt.*;
import java.io.*;
public class searchFrame extends JFrame
     public searchFrame()
          setTitle("Dictionary A'la Lewis");
          // Get the toolkit for reading System information
          Toolkit tk = Toolkit.getDefaultToolkit();
          // Get the dimensions of the screen
          Dimension screenDimension = tk.getScreenSize();
          // Set the size
          setSize(620, 535);
          // Centre window on screen
          setLocation(new Point((screenDimension.width - 600) / 2, (screenDimension.height - 535) / 2));
          JComboBox notCombo = new JComboBox();
          notCombo.setPreferredSize(new Dimension(95, 40));
          notCombo.setEnabled(true);
          JComboBox notCombo2 = new JComboBox();
          notCombo2.setPreferredSize(new Dimension(95, 40));
          notCombo2.setEnabled(true);
          JComboBox dictionaryType = new JComboBox();
          dictionaryType.setPreferredSize(new Dimension(95, 40));
          dictionaryType.setEnabled(true);
          JComboBox dictionaryType2 = new JComboBox();
          dictionaryType2.setPreferredSize(new Dimension(95, 40));
          dictionaryType2.setEnabled(true);
          JPanel notPanel = new JPanel();
          JPanel dictionaryPanel = new JPanel();
          notPanel.setLayout(new GridLayout(2, 0, 10, 10));
          notPanel.add(notCombo);
          notPanel.add(notCombo2);
          dictionaryPanel.setLayout(new GridLayout(2, 0, 10, 10));
          dictionaryPanel.add(dictionaryType);
          dictionaryPanel.add(dictionaryType2);
          //Search button
          JButton searchButton = new JButton("Search");
          //Back button
          JButton backButton = new JButton("< Back");
          //Exit button
          JButton exitButton = new JButton("Exit");
          SpringLayout layout = new SpringLayout();
          getContentPane().setLayout(layout);
          layout.putConstraint(SpringLayout.NORTH, notPanel, 10, SpringLayout.NORTH, getContentPane());
          layout.putConstraint(SpringLayout.WEST, notPanel, 10, SpringLayout.WEST, getContentPane());
          layout.putConstraint(SpringLayout.NORTH, dictionaryPanel, 10, SpringLayout.NORTH, getContentPane());
          layout.putConstraint(SpringLayout.WEST, dictionaryPanel, 10, SpringLayout.EAST, notPanel);
          layout.putConstraint(SpringLayout.SOUTH, backButton, -10, SpringLayout.SOUTH, getContentPane());
          layout.putConstraint(SpringLayout.WEST, backButton, 10, SpringLayout.WEST, getContentPane());
          layout.putConstraint(SpringLayout.WEST, exitButton, 10, SpringLayout.EAST, backButton);
          layout.putConstraint(SpringLayout.SOUTH, exitButton, -10, SpringLayout.SOUTH, getContentPane());
          layout.putConstraint(SpringLayout.SOUTH, searchButton, -10, SpringLayout.SOUTH, getContentPane());
          layout.putConstraint(SpringLayout.EAST, searchButton, -10, SpringLayout.EAST, getContentPane());
          getContentPane().add(notPanel);
          getContentPane().add(dictionaryPanel);
          getContentPane().add(searchButton);
          getContentPane().add(backButton);
          getContentPane().add(exitButton);
     public static void main(String[] args) throws IOException
          JFrame search = new searchFrame();
          search.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          search.show();
}On this one I want to keep the scroll pane centred (which it won't be at the mo) and I also want to keep the label saying so many results found to the scroll pane's right edge (which it won't be at the moment if the table moves because of the screen resizing).
import javax.swing.*;
import java.awt.*;
import java.io.*;
public class resultsFrame extends JFrame
     public resultsFrame()
          setTitle("Dictionary A'la Lewis");
          // Get the toolkit for reading System information
          Toolkit tk = Toolkit.getDefaultToolkit();
          // Get the dimensions of the screen
          Dimension screenDimension = tk.getScreenSize();
          // Set the size
          setSize(620, 535);
          // Centre window on screen
          setLocation(new Point((screenDimension.width - 600) / 2, (screenDimension.height - 535) / 2));
          //Search button
          JButton refineButton = new JButton("Refine");
          //Back button
          JButton homeButton = new JButton("Home");
          //Exit button
          JButton exitButton = new JButton("Exit");
          //Results Table
          JTable resultsTable = new JTable();
          resultsTable.doLayout();
          //Table's Scroll Pane
          JScrollPane tableScrollPane = new JScrollPane(resultsTable);
          tableScrollPane.setPreferredSize(new Dimension(520, 290));
          //Number of Results
          JLabel numberOfResults = new JLabel("0 results found.");
          SpringLayout layout = new SpringLayout();
          getContentPane().setLayout(layout);
          layout.putConstraint(SpringLayout.SOUTH, homeButton, -10, SpringLayout.SOUTH, getContentPane());
          layout.putConstraint(SpringLayout.WEST, homeButton, 10, SpringLayout.WEST, getContentPane());
          layout.putConstraint(SpringLayout.WEST, exitButton, 10, SpringLayout.EAST, homeButton);
          layout.putConstraint(SpringLayout.SOUTH, exitButton, -10, SpringLayout.SOUTH, getContentPane());
          layout.putConstraint(SpringLayout.SOUTH, refineButton, -10, SpringLayout.SOUTH, getContentPane());
          layout.putConstraint(SpringLayout.EAST, refineButton, -10, SpringLayout.EAST, getContentPane());
          layout.putConstraint(SpringLayout.NORTH, tableScrollPane, 10, SpringLayout.NORTH, getContentPane());
          layout.putConstraint(SpringLayout.WEST, tableScrollPane, 50, SpringLayout.WEST, getContentPane());
          layout.putConstraint(SpringLayout.EAST, numberOfResults, 0, SpringLayout.EAST, tableScrollPane);
          layout.putConstraint(SpringLayout.NORTH, numberOfResults, 5, SpringLayout.SOUTH, tableScrollPane);
          getContentPane().add(tableScrollPane);
          getContentPane().add(refineButton);
          getContentPane().add(homeButton);
          getContentPane().add(exitButton);
          getContentPane().add(numberOfResults);
     public static void main(String[] args) throws IOException
          JFrame result = new resultsFrame();
          result.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          result.show();
}