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    <p>A few suggestions:</p> <ol> <li>Don't set the JFrame's size, and in fact don't set any sizes.</li> <li>Call pack to all the components to set their own sizes.</li> <li>If you want the buttons bigger, consider changing the size of their fonts.</li> </ol> <p>e.g.,</p> <p><img src="https://i.stack.imgur.com/fLKZJ.png" alt="Calc2 GUI"></p> <pre><code>import java.awt.BorderLayout; import java.awt.Font; import java.awt.GridLayout; import javax.swing.*; public class Calc2 { public static final String[][] BUTTON_TEXTS = { {"7", "8", "9", "+"}, {"4", "5", "6", "-"}, {"1", "2", "3", "*"}, {"0", ".", "/", "="} }; public static final Font BTN_FONT = new Font(Font.SANS_SERIF, Font.BOLD, 24); private static void createAndShowGui() { JTextField field = new JTextField(10); field.setFont(BTN_FONT.deriveFont(Font.PLAIN)); JPanel btnPanel = new JPanel(new GridLayout(BUTTON_TEXTS.length, BUTTON_TEXTS[0].length)); for (int i = 0; i &lt; BUTTON_TEXTS.length; i++) { for (int j = 0; j &lt; BUTTON_TEXTS[i].length; j++) { JButton btn = new JButton(BUTTON_TEXTS[i][j]); btn.setFont(BTN_FONT); btnPanel.add(btn); } } JPanel mainPanel = new JPanel(new BorderLayout()); mainPanel.add(field, BorderLayout.PAGE_START); mainPanel.add(btnPanel, BorderLayout.CENTER); JFrame frame = new JFrame("Calc2"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(mainPanel); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } } </code></pre>
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    1. POabout layouts in simple calculator
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    1. USAndrew Thompson
    1. USHovercraft Full Of Eels
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    1. CObut if i dont resize the JFrame than it has very little size. and i want bigger buttons with text area_?
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      1. USquartaela
    2. COAgain, set the font, but don't set the size else you'll see the problem you're seeing above, and you'll have incompatible GUI when run on other OS's or this OS with a different screen resolution. See edit above.
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    3. CO@Andrew: Please make a screen shot. :)
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