GetOpenProperties.java Source code

Introduction

Here is the source code for GetOpenProperties.java

Source

/* From http://java.sun.com/docs/books/tutorial/index.html */
/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */
/**
 * This applet is the same in 1.1 as in 1.0.
 * 
 * @author Marianne Mueller
 * @author Kathy Walrath
 */

import java.applet.Applet;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Label;

public class GetOpenProperties extends Applet implements Runnable {
    String[] propertyNames = { "file.separator", "line.separator", "path.separator", "java.class.version",
            "java.vendor", "java.vendor.url", "java.version", "os.name", "os.arch", "os.version" };

    final int numProperties = propertyNames.length;

    Label[] values;

    public void init() {
        //Set up the layout.
        GridBagLayout gridbag = new GridBagLayout();
        setLayout(gridbag);
        GridBagConstraints labelConstraints = new GridBagConstraints();
        GridBagConstraints valueConstraints = new GridBagConstraints();
        labelConstraints.anchor = GridBagConstraints.WEST;
        labelConstraints.ipadx = 10;
        valueConstraints.fill = GridBagConstraints.HORIZONTAL;
        valueConstraints.gridwidth = GridBagConstraints.REMAINDER;
        valueConstraints.weightx = 1.0; //Extra space to values column.

        //Set up the Label arrays.
        Label[] names = new Label[numProperties];
        values = new Label[numProperties];
        String firstValue = "not read yet";

        for (int i = 0; i < numProperties; i++) {
            names[i] = new Label(propertyNames[i]);
            gridbag.setConstraints(names[i], labelConstraints);
            add(names[i]);

            values[i] = new Label(firstValue);
            gridbag.setConstraints(values[i], valueConstraints);
            add(values[i]);
        }

        new Thread(this, "Loading System Properties").start();
    }

    /*
     * This method runs in a separate thread, loading properties one by one.
     */
    public void run() {
        String value = null;

        Thread.currentThread().setPriority(Thread.MIN_PRIORITY);

        //Pause to let the reader see the default strings.
        pause(3000);

        for (int i = 0; i < numProperties; i++) {
            //Pause for dramatic effect.
            pause(250);

            try {
                value = System.getProperty(propertyNames[i]);
                values[i].setText(value);
            } catch (SecurityException e) {
                values[i].setText("Could not read: " + "SECURITY EXCEPTION!");
            }
        }
    }

    synchronized void pause(int millis) {
        try {
            wait(millis);
        } catch (InterruptedException e) {
        }
    }
}