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    <p>The default layout manager for a <code>JFrame</code> is <code>BorderLayout</code>. <code>BorderLayout</code> only allows a single component to occupy any of the available spaces it managers.</p> <p>Instead, try changing the layout manager to something like <code>GridLayout</code></p> <p>Something like <code>frame.setLayout(new GridLayout(9, 9));</code> for example might help</p> <p>You should not be using <code>setBounds</code> as it will have no effect on components under the control of layout managers. Instead, you should use the cols and rows constructor of <code>JTextArea</code> to provide details about how you want the text area sized to</p> <p><strong>Update with <code>GridLayout</code> example</strong></p> <p><img src="https://i.stack.imgur.com/4uR9y.png" alt="GridLayout example"></p> <p>Each <code>JTextArea</code> will be give equal amount of the available space, so as you resize the window, the fields will also change size...</p> <pre><code>import java.awt.Color; import java.awt.EventQueue; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.GridLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import static javax.swing.JFrame.EXIT_ON_CLOSE; import javax.swing.JTextArea; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class TestLayout101 { public static void main(String[] args) { new TestLayout101(); } public TestLayout101() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { ex.printStackTrace(); } JFrame frame = new JFrame(); frame.setTitle("Sudoku"); frame.setLocation(500, 0); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setLayout(new GridLayout(9, 9)); JTextArea[][] field = new JTextArea[9][9]; //Initiate faces for (int j = 0; j &lt; 9; j++) { for (int i = 0; i &lt; 9; i++) { field[i][j] = new JTextArea(1, 3); field[i][j].setBorder(BorderFactory.createLineBorder(Color.BLACK)); field[i][j].setText(i + " " + j); frame.add(field[i][j]); } } frame.pack(); frame.setVisible(true); } }); } } </code></pre> <p><strong>Updated with <code>GridBagLayout</code> example</strong></p> <p>This will provide each <code>JTextArea</code> with it's preferred size, if enough space is available.</p> <p><img src="https://i.stack.imgur.com/xqmZO.png" alt="enter image description here"></p> <p>This will mean as you resize the window, the fields won't change in size, unless there isn't enough space available to honour the preferred or minimum size...</p> <pre><code>import java.awt.Color; import java.awt.EventQueue; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.GridLayout; import javax.swing.BorderFactory; import javax.swing.JFrame; import static javax.swing.JFrame.EXIT_ON_CLOSE; import javax.swing.JTextArea; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class TestLayout101 { public static void main(String[] args) { new TestLayout101(); } public TestLayout101() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { ex.printStackTrace(); } JFrame frame = new JFrame(); frame.setTitle("Sudoku"); frame.setLocation(500, 0); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setLayout(new GridBagLayout()); JTextArea[][] field = new JTextArea[9][9]; //Initiate faces GridBagConstraints gbc = new GridBagConstraints(); for (int j = 0; j &lt; 9; j++) { gbc.gridy = j; for (int i = 0; i &lt; 9; i++) { gbc.gridx = i; field[i][j] = new JTextArea(1, 3); field[i][j].setBorder(BorderFactory.createLineBorder(Color.BLACK)); field[i][j].setText(i + " " + j); frame.add(field[i][j], gbc); } } frame.pack(); frame.setVisible(true); } }); } } </code></pre>
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