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copied!<p><img src="https://i.stack.imgur.com/aGdqU.png" alt="Calculator GUI"></p> <pre><code>import java.awt.*; import javax.swing.*; import javax.swing.border.EmptyBorder; // no need to extend frame! //public class Calculator extends JFrame { public class Calculator { public Calculator(){ initComponents(); } private void initComponents(){ // I find it easier to create a panel and SET it as the content pane JPanel gui = new JPanel(new BorderLayout(5,5)); // add some padding to the main GUI gui.setBorder(new EmptyBorder(4,4,4,4)); // not needed if only a single compoinent is to be added! //JPanel panelScreen = new JPanel(new GridLayout(0,1)); // add some constraints to make the output field bigger. // if it is intended to be single line, a JTextField should be used. JTextArea screen = new JTextArea(2,25); gui.add(screen, BorderLayout.NORTH); //panelScreen.add(screen); JFrame frame = new JFrame("CALCULATOR"); frame.setContentPane(gui); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // add padding around the buttons JPanel panelButtons = new JPanel(new GridLayout(3,3,4,4)); JButton oneButton = new JButton("1"); panelButtons.add(oneButton); JButton twoButton = new JButton("2"); panelButtons.add(twoButton); JButton threeButton = new JButton("3"); panelButtons.add(threeButton); JButton fourButton = new JButton("4"); panelButtons.add(fourButton); JButton fiveButton = new JButton("5"); panelButtons.add(fiveButton); JButton sixButton = new JButton("6"); panelButtons.add(sixButton); JButton sevenButton = new JButton("7"); panelButtons.add(sevenButton); JButton eightButton = new JButton("8"); panelButtons.add(eightButton); JButton nineButton = new JButton("9"); panelButtons.add(nineButton); //frame.getContentPane().add(new JSeparator(), BorderLayout.CENTER); // Add the buttons to the CENTER and they will // fill whatever space they are provided. gui.add(panelButtons, BorderLayout.CENTER); //frame.setBounds(50, 50, 500, 500); //frame.setResizable(false); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { new Calculator(); } }); } } </code></pre>

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