Java Swing How to - Set preferred Size for BoxLayout Manager

Question

We would like to know how to set preferred Size for BoxLayout Manager.

Answer

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
// ww  w.  j  a v  a2 s .c  o  m
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel controlPane = new JPanel();
    JPanel buttonPane = new JPanel();

    controlPane.setLayout(new BoxLayout(controlPane, BoxLayout.PAGE_AXIS));
    controlPane.setPreferredSize(new Dimension(200, 200));
    controlPane.add(new JScrollPane(new JTextArea()));

    buttonPane.setLayout(new FlowLayout(FlowLayout.LEFT));
    buttonPane.setPreferredSize(new Dimension(100, 40));
    buttonPane.add(new JButton("Button1"));
    buttonPane.add(new JButton("Button2"));

    frame.add(controlPane, BorderLayout.NORTH);
    frame.add(buttonPane, BorderLayout.SOUTH);

    frame.pack();
    frame.setVisible(true);
  }
}