How to set vertical alignment for a component in Java?

For vertical alignment, create a frame and set the layout using the BoxLayout manager −

JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.Y_AXIS));

Above, we have set the BoxLayout to set the alignment since it is a layout manager that allows multiple components to be laid out either vertically or horizontally. We have set vertical alignment here −

BoxLayout.X_AXIS

The following is an example to set vertical alignment for a component −

Example

package my; import java.awt.Component; import java.awt.Dimension; import javax.swing.BorderFactory; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo {    public static void main(String[] args) {       JFrame frame = new JFrame();       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.Y_AXIS));       JPanel panel = new JPanel();       JButton btn1 = new JButton("Clear");       JButton btn2 = new JButton("Reset");       JButton btn3 = new JButton("Submit");       panel.add(btn1);       panel.add(btn2);       panel.add(btn3);       panel.setAlignmentX(Component.LEFT_ALIGNMENT);       panel.setPreferredSize(new Dimension(100, 500));       panel.setMaximumSize(new Dimension(100, 500));       panel.setBorder(BorderFactory.createTitledBorder("demo"));       frame.getContentPane().add(panel);       frame.setSize(550, 300);       frame.setVisible(true);    } }

Output