boxlayoutdemo3.java

来自「java 完全探索的随书源码」· Java 代码 · 共 50 行

// BoxLayoutDemo3.java

import javax.swing.*;
import javax.swing.border.*;

import java.awt.*;
import java.awt.event.*;

class BoxLayoutDemo3 extends JFrame
{
   BoxLayoutDemo3 (String title)
   {
      super (title);

      addWindowListener (new WindowAdapter ()
                         {
                             public void windowClosing (WindowEvent e)
                             {
                                System.exit (0);
                             }
                         });

      JPanel jp = new JPanel ();
      jp.setLayout (new BoxLayout (jp, BoxLayout.Y_AXIS));

      JButton jb = new JButton ("Top row");
      jb.setMaximumSize (new Dimension (300, 100));
      jp.add (jb);

      JLabel jl = new JLabel ("Middle row");
      jl.setMaximumSize (new Dimension (300, 100));
      jp.add (jl);
      jl.setBorder (new LineBorder (Color.red));

      jb = new JButton ("Bottom row");
      jb.setMaximumSize (new Dimension (300, 100));
      jp.add (jb);

      getContentPane ().add (jp);

      setSize (300, 100);
      setVisible (true);
   }

   public static void main (String [] args)
   {
      new BoxLayoutDemo3 ("Box Layout Demo3");
   }
}