import javax.swing.SpringLayout;import javax.swing.Spring;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JTextField;import java.awt.Container;import java.awt.Component;public class SpringDemo4 {    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        //Make sure we have nice window decorations.        JFrame.setDefaultLookAndFeelDecorated(true);        //Create and set up the window.        JFrame frame = new JFrame("SpringDemo4");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Set up the content pane.        Container contentPane = frame.getContentPane();        SpringLayout layout = new SpringLayout();        contentPane.setLayout(layout);        //Create and add the components.        JLabel label = new JLabel("Label: ");        JTextField textField = new JTextField("Text field", 15);        contentPane.add(label);        contentPane.add(textField);        //Adjust constraints for the label so it's at (5,5).        SpringLayout.Constraints labelCons =                layout.getConstraints(label);        labelCons.setX(Spring.constant(5));        labelCons.setY(Spring.constant(5));        //Adjust constraints for the text field so it's at        //(<label's right edge> + 5, 5).        SpringLayout.Constraints textFieldCons =                layout.getConstraints(textField);        textFieldCons.setX(Spring.sum(                Spring.constant(5),                labelCons.getConstraint(SpringLayout.EAST)));        textFieldCons.setY(Spring.constant(5));        //Adjust constraints for the content pane.        setContainerSize(contentPane, 5);        //Display the window.        frame.pack();        frame.setVisible(true);    }    public static void main(String[] args) {        //Schedule a job for the event-dispatching thread:        //creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }    public static void setContainerSize(Container parent,                                        int pad) {        SpringLayout layout = (SpringLayout) parent.getLayout();        Component[] components = parent.getComponents();        Spring maxHeightSpring = Spring.constant(0);        SpringLayout.Constraints pCons = layout.getConstraints(parent);        //Set the container's right edge to the right edge        //of its rightmost component + padding.        Component rightmost = components[components.length - 1];        SpringLayout.Constraints rCons =                layout.getConstraints(rightmost);        pCons.setConstraint(                SpringLayout.EAST,                Spring.sum(Spring.constant(pad),                           rCons.getConstraint(SpringLayout.EAST)));        //Set the container's bottom edge to the bottom edge        //of its tallest component + padding.        for (int i = 0; i < components.length; i++) {            SpringLayout.Constraints cons =                layout.getConstraints(components[i]);            maxHeightSpring = Spring.max(maxHeightSpring,                                         cons.getConstraint(                                                SpringLayout.SOUTH));        }        pCons.setConstraint(                SpringLayout.SOUTH,                Spring.sum(Spring.constant(pad),                           maxHeightSpring));   }}