import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.SpringLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.border.Border;
import javax.swing.border.LineBorder;

import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class springLayout {

    public static void createAndShowGUI() {

    	// SpringLayout DialogBox
    	final JDialog springLayoutDialogBox = new JDialog();
    	springLayoutDialogBox.setSize(500,300);
    	springLayoutDialogBox.setLocationRelativeTo(null); // center
    	springLayoutDialogBox.setTitle("SpringLayout");
    	JPanel panel = new JPanel();

    	SpringLayout springLay = new SpringLayout();
    	panel.setLayout(springLay);

    	// create A
    	JButton A = new JButton("A");
    	A.setPreferredSize(new Dimension (100,25));
    	// placement of button A
    	springLay.putConstraint(SpringLayout.WEST, A,
                             7,	SpringLayout.WEST, panel);

    	springLay.putConstraint(SpringLayout.NORTH, A,
                			 7,	SpringLayout.NORTH, panel);
    	// add button A to panel
    	panel.add(A);

    	// create button B
    	JButton B = new JButton("B");
    	B.setPreferredSize(new Dimension (50,25));
    	// placement of button B
    	springLay.putConstraint(SpringLayout.WEST, B,
                			 7, SpringLayout.EAST, A);

    	springLay.putConstraint(SpringLayout.NORTH, B,
                 			 7, SpringLayout.NORTH, panel);
    	// add button B to panel
    	panel.add(B);

    	// create button C
    	JButton C = new JButton("C");
    	// placement of button C
    	springLay.putConstraint(SpringLayout.SOUTH, C,
    						 7, SpringLayout.SOUTH, panel);
    	springLay.putConstraint(SpringLayout.WEST, C,
    						 7, SpringLayout.WEST, panel);

    	springLay.putConstraint(SpringLayout.SOUTH, C,
    						-7, SpringLayout.SOUTH, panel);
    	springLay.putConstraint(SpringLayout.EAST, C,
    						 7, SpringLayout.EAST, panel);

    	springLay.putConstraint(SpringLayout.EAST, C,
    						-7, SpringLayout.EAST, panel);
    	springLay.putConstraint(SpringLayout.NORTH, C,
    						 7, SpringLayout.SOUTH, A);
    	// add button C to panel
    	panel.add(C);

    	springLayoutDialogBox.add(panel);

        //Display the window.
    	springLayoutDialogBox.setVisible(true);

    	 // Exit
        ActionListener exit = (new ActionListener()
        {
            public void actionPerformed(ActionEvent arg0)
            {
            	springLayoutDialogBox.dispose();
            }

        });

        A.addActionListener(exit);
        B.addActionListener(exit);
        C.addActionListener(exit);
    }
    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}