swing - Java: vertical alignment within JPanel

Question

I am trying to vertically align (center) both JLabels inside one JPanel.

JPanel panel = new JPanel();
panel.setPreferredSize(size);
JLabel label1 = new JLabel(icon);
JLabel label2 = new JLabel("text");
panel.add(label1);
panel.add(label2);

I have tried using setAligmentY() with no success. Both labels always appear on the top of JPanel.

UPD: Labels should be located next to each other like using FlowLayout, but in the middle of the JPanel.

Answer 1

Use a GridBagLayout with the default constraints. Here is a small demo code:

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class TestVerticalAlignement {

    protected void initUI() {
        final JFrame frame = new JFrame();
        frame.setTitle("Test vertical alignement");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        panel.setLayout(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        JLabel label1 = new JLabel("label1");
        JLabel label2 = new JLabel("label2");
        panel.add(label1, gbc);
        panel.add(label2, gbc);
        frame.add(panel);
        frame.setSize(300, 300);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new TestVerticalAlignement().initUI();
            }
        });
    }

}