Java by API/javax.swing/BoxLayout

BoxLayout.X_AXIS

import java.awt.BorderLayout;
import java.awt.ruponent;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass {
  public static void main(String[] a) {
    JFrame frame = new JFrame("Alignment Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    String labels[] = { "--", "----", "--------", "------------" };
    JPanel container = new JPanel();
    BoxLayout layout = new BoxLayout(container, BoxLayout.X_AXIS);
    container.setLayout(layout);
    for (int i = 0; i < labels.length; i++) {
      JButton button = new JButton(labels[i]);
      button.setAlignmentX(Component.TOP_ALIGNMENT);
      container.add(button);
    }
    frame.add(container, BorderLayout.CENTER);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

BoxLayout.Y_AXIS

import java.awt.BorderLayout;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass {
  public static void main(String[] a) {
    JFrame frame = new JFrame("Alignment Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    String labels[] = { "--", "----", "--------", "------------" };
    JPanel container = new JPanel();
    BoxLayout layout = new BoxLayout(container, BoxLayout.Y_AXIS);
    container.setLayout(layout);
    for (int i = 0; i < labels.length; i++) {
      JButton button = new JButton(labels[i]);
      container.add(button);
    }
    frame.add(container, BorderLayout.CENTER);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

new BoxLayout(Container target, int axis)

import java.awt.BorderLayout;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass {
  public static void main(String[] a) {
    JFrame frame = new JFrame("Alignment Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    String labels[] = { "--", "----", "--------", "------------" };
    JPanel container = new JPanel();
    BoxLayout layout = new BoxLayout(container, BoxLayout.Y_AXIS);
    container.setLayout(layout);
    for (int i = 0; i < labels.length; i++) {
      JButton button = new JButton(labels[i]);
      container.add(button);
    }
    frame.add(container, BorderLayout.CENTER);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}