StackOverflow2013

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POneed assistance with GUIs and java swing
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copied!<p>This is my program below and I am trying to figure out where my main method should be. I have seen a few examples of it being implemented at the very end of the program but there main is different from mine. </p> <p>Main method (to be implemented):</p> <pre><code> public class JFrame { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setTitle("Components File"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } </code></pre> <p>My Program</p> <pre><code> import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; public class Lab_10 extends JFrame { private final double EARTHQUAKE_RATE= 8.0; private final int FRAME_WIDTH= 300; private final int FRAME_HEIGHT= 200; private JLabel rLabel; private JTextField eField; private JButton button; private JLabel earthLabel; public Lab_10() { JLabel earthLabel = new JLabel("Most structures fall"); makeTextField(); makeButton(); makePanel(); setSize(FRAME_WIDTH, FRAME_HEIGHT); } private void makeTextField() { JLabel rLabel = new JLabel("Richter"); final int FIELD_WIDTH = 10; eField = new JTextField(FIELD_WIDTH); eField.setText("" + EARTHQUAKE_RATE); } class AddLabelListener implements ActionListener { public void actionPerformed(ActionEvent event) { earthLabel.setText("Most structures fall"); } } private void makeButton() { JButton button = new JButton("Enter"); ActionListener listener = new AddLabelListener(); button.addActionListener(listener); } private void makePanel() { JPanel panel = new JPanel(); panel.add(rLabel); panel.add(eField); panel.add(button); panel.add(earthLabel); add(panel); } } </code></pre> <p>Updated Code (which is compiling but and running but with logic errors because it implements an empty frame [guess as much from the main method I have]):</p> <pre><code> import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; public class Lab_10 extends JFrame { private final double EARTHQUAKE_RATE= 8.0; private final int FRAME_WIDTH= 300; private final int FRAME_HEIGHT= 200; private JLabel rLabel; private JTextField eField; private JButton button; private JLabel earthLabel; public Lab_10() { JLabel earthLabel = new JLabel("Most structures fall"); makeTextField(); makeButton(); makePanel(); setSize(FRAME_WIDTH, FRAME_HEIGHT); } private void makeTextField() { JLabel rLabel = new JLabel("Richter"); final int FIELD_WIDTH = 10; eField = new JTextField(FIELD_WIDTH); eField.setText("" + EARTHQUAKE_RATE); } class AddLabelListener implements ActionListener { public void actionPerformed(ActionEvent event) { earthLabel.setText("Most structures fall"); } } private void makeButton() { JButton button = new JButton("Enter"); ActionListener listener = new AddLabelListener(); button.addActionListener(listener); } private void makePanel() { JPanel panel = new JPanel(); panel.add(rLabel); panel.add(eField); panel.add(button); panel.add(earthLabel); add(panel); } public static void main(String[] args){ javax.swing.SwingUtilities.invokeLater(new Runnable(){ @Override public void run() { JFrame frame = new JFrame(); frame.setTitle("Components File"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }); } } </code></pre>

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