Applet System Properties
/* From http://java.sun.com/docs/books/tutorial/index.html */
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/**
* 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) {
}
}
}
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