[자바 GUI] BoxLayout

BoxLayout같은경우 항상 수직방향으로 컴포넌트가 추가된다. 

 
import java.awt.BorderLayout;
import java.awt.Color;
 
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
 
public class Layout {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Test");
        JPanel panel = new JPanel();
        
        
        
        JButton bt = new JButton("EAST");
        JButton bt1 = new JButton("WEST");
        JButton bt2= new JButton("SOUTH");
        JButton bt3 = new JButton("NORTH");
        JButton bt4 = new JButton("CENTER");
 
        panel.add(bt);
        panel.add(bt1);
        panel.add(bt2);
        panel.add(bt3);
        panel.add(bt4);
        
        
        panel.setLayout(new BoxLayout(panel,  BoxLayout.Y_AXIS));
        
        
        panel.setBackground(Color.BLACK);
        
        frame.getContentPane().add(BorderLayout.EAST,panel);
        
        
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 300);
        frame.setVisible(true);
    }
}