Swing course feedback form

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Locale;

public class Main {

javax.swing supplies buttons, labels, panels and frames. java.awt supplies layouts, colours and fonts. java.awt.event supplies listener/event types. Locale is available where text formatting needs it. Main matches the source filename.

    static JPanel root(String title) {
        for(String key:new String[]{"Label.font","Button.font","RadioButton.font","CheckBox.font","TextField.font","TextArea.font","ComboBox.font"})UIManager.put(key,new Font(Font.SANS_SERIF,Font.PLAIN,18));

root configures the selected UIManager font keys to an 18-point sans-serif font before creating the form’s components. This affects the Java application, not the website’s CSS.

        JPanel panel=new JPanel(new BorderLayout(12,12));panel.setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
        JLabel heading=new JLabel(title);heading.setFont(new Font(Font.SANS_SERIF,Font.BOLD,24));panel.add(heading,BorderLayout.NORTH);return panel;
    }

BorderLayout places the heading in NORTH and leaves CENTER for each experiment’s form. The empty border adds padding; the heading uses a larger bold font. Return the JPanel for further assembly.

    static void show(String title,JPanel panel) {
        JFrame frame=new JFrame(title);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setContentPane(panel);frame.pack();frame.setLocationRelativeTo(null);frame.setVisible(true);
    }

show creates a JFrame, installs its content, packs it to component sizes, centres it and makes it visible. EXIT_ON_CLOSE ends this demonstration application when its window closes. The desktop main calls this helper on the event-dispatch thread.

    public static JPanel createPanel(){
        JPanel panel=root("Course Feedback");JPanel form=new JPanel();form.setLayout(new BoxLayout(form,BoxLayout.Y_AXIS));
        String[] questions={"Clarity of explanation","Practice usefulness","Overall experience"};ButtonGroup[] groups=new ButtonGroup[questions.length];

createPanel returns the assembled UI. A vertical BoxLayout stacks question rows. Each ButtonGroup enforces one radio selection for its own question, rather than one selection across the whole survey.

        for(int q=0;q<questions.length;q++){
            JPanel row=new JPanel(new FlowLayout(FlowLayout.LEFT));row.add(new JLabel(questions[q]));groups[q]=new ButtonGroup();
            for(int r=1;r<=5;r++){JRadioButton button=new JRadioButton(Integer.toString(r));button.setActionCommand(Integer.toString(r));button.setName("rating-"+q+"-"+r);groups[q].add(button);row.add(button);}form.add(row);
        }

For each question, make a row and five radio buttons labelled 1–5. Action commands store the selected numeric rating; names identify components for tests. Add the radio buttons to both their logical group and the visible row.

        JTextArea comments=new JTextArea(5,42);comments.setLineWrap(true);comments.setWrapStyleWord(true);comments.setName("comments");form.add(new JLabel("Suggestions / comments"));form.add(new JScrollPane(comments));
        JTextArea output=new JTextArea(5,42);output.setEditable(false);output.setLineWrap(true);output.setWrapStyleWord(true);output.setName("summary");form.add(new JScrollPane(output));

Comments wrap within a scroll pane. The output area is not editable by the student but its text can be updated by the listener. Component names support finding the correct fields in tests.

        JButton submit=new JButton("Submit"),clear=new JButton("Clear");JPanel buttons=new JPanel();buttons.add(submit);buttons.add(clear);form.add(buttons);
        submit.addActionListener(e->{

Creating an ActionListener does not submit anything immediately. Its lambda runs later when Submit generates an action event.

            StringBuilder result=new StringBuilder();
            for(int q=0;q<groups.length;q++){if(groups[q].getSelection()==null){output.setText("Please answer every rating question.");return;}result.append(questions[q]).append(": ").append(groups[q].getSelection().getActionCommand()).append("/5\n");}
            result.append("Comments: ").append(comments.getText().trim());output.setText(result.toString());
        });

Use StringBuilder to accumulate the selected action commands. If any group has no selection, display the instruction and return from the listener. Otherwise append trimmed comments and replace the output text. No network request is made.

        clear.addActionListener(e->{for(ButtonGroup group:groups)group.clearSelection();comments.setText("");output.setText("");});
        panel.add(form,BorderLayout.CENTER);return panel;
    }

The Clear listener resets every radio group, comments and summary. Add the form to CENTER and return panel to the caller.

    public static void main(String[] args){SwingUtilities.invokeLater(()->show("Course Feedback",createPanel()));}

}

SwingUtilities.invokeLater schedules the lambda on Swing’s event-dispatch thread. The lambda creates the panel and calls show. This main needs a graphical desktop; the panel and its event handlers are separate from console input.