StackOverflow2013

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copied!<p>I have a couple of recommendations:</p> <ul> <li>set the GridLayout constants when calling its constructor. e.g., <code>GridLayout gridLayout1 = new GridLayout(0, 3);</code></li> <li>Don't set the bounds of your GUI but let the GUI's layout managers do this for you based on its preferred size.</li> <li>Don't forget to call pack() on the JFrame after adding all components</li> <li>I usually call <code>setLocationRelativeTo(null);</code> after calling <code>pack();</code> and before calling <code>setVisible(true);</code></li> <li>Don't forget to call <code>setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);</code> in your class's (JFrame) constructor.</li> <li>One way to set the button's size is to set the Font of the button to be larger.</li> </ul> <p>e.g.,</p> <pre><code>import java.awt.*; import javax.swing.*; public class TPad extends JPanel { public static final String[][] BTN_TEXTS = { {"1", "2", "3"}, {"4", "5", "6"}, {"7", "8", "9"}, {"*", "0", "#"} }; private static final int GAP = 5; private static final int FONT_POINTS = 36; private static final Font BTN_FONT = new Font(Font.SANS_SERIF, Font.BOLD, FONT_POINTS); public TPad() { int rows = BTN_TEXTS.length; int cols = BTN_TEXTS[0].length; setLayout(new GridLayout(rows, cols, GAP, GAP)); setBorder(BorderFactory.createEmptyBorder(GAP, GAP, GAP, GAP)); for (int row = 0; row < BTN_TEXTS.length; row++) { for (int col = 0; col < BTN_TEXTS[row].length; col++) { JButton btn = new JButton(BTN_TEXTS[row][col]); btn.setFont(BTN_FONT); add(btn); } } } private static void createAndShowUI() { JFrame frame = new JFrame("TPad"); frame.getContentPane().add(new TPad()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { createAndShowUI(); } }); } } </code></pre>

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