Question

Even though it’s a valid method, JComboBox#setVisible doesn’t hide my JComboBox. Am I doing something wrong? If not, are there any alternatives?

Answer 1

Since you don’t show any interest in posting an SSCCE, here is mine showing that what you stated in question is false and nothing can be done until you post your code.

This works fine for me ,

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class FrameTest extends JFrame implements ActionListener {

    JComboBox test;

    public FrameTest() {
        setLayout(new FlowLayout());
        setSize(550, 100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JButton hideJCombo = new JButton("Hide my JCombobox!");
        JButton showJCombo = new JButton("Show my JCombobox!");

        String course[] = {"This", "is", "a", "sample", "for", "StackOverflow"};
        test = new JComboBox(course);

        add(hideJCombo);
        add(test);
        add(showJCombo);


        hideJCombo.setActionCommand("hide");
        showJCombo.setActionCommand("show");

        hideJCombo.addActionListener(this);
        showJCombo.addActionListener(this);

    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new FrameTest().setVisible(true);

            }
        });
    }

    @Override
    public void actionPerformed(ActionEvent e) {

        if ("hide".equals(e.getActionCommand())) {
            test.setVisible(false);
            System.out.println("hide");
        } else if ("show".equals(e.getActionCommand())) {
            test.setVisible(true);
        }

    }
}