springgrid.java

Java样例程序集合：2D

/*
 * A 1.4 application that uses SpringLayout to lay out a grid.
 * Other files required: SpringUtilities.java
 */

import javax.swing.*;
import java.awt.*;

public class SpringGrid {
    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create the panel and populate it.
        JPanel panel = new JPanel(new SpringLayout());
        for (int i = 0; i < 9; i++) {
            JTextField textField = new JTextField(Integer.toString(i));

            //Make the 4th field extra big.
            if (i == 4) {
                textField.setText("This one is extra long.");
            }

            panel.add(textField);
        }

        //Lay out the panel.
        SpringUtilities.makeGrid(panel,
                                 3, 3, //rows, cols
                                 5, 5, //initialX, initialY
                                 5, 5);//xPad, yPad

        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);

        //Create and set up the window.
        JFrame frame = new JFrame("SpringGrid");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Set up the content pane.
        panel.setOpaque(true); //content panes must be opaque
        frame.setContentPane(panel);

        //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();
            }
        });
    }
}