MyApplet.java
Download MyApplet.java
1: // Signed MyApplet Demo - A simple Applet, signed.
2: // Once signed, the user can allow extra permissions for any applet
3: // (or WebStart) program.
4: //
5: // Written 8/2013 by Wayne Pollock, Tampa Florida USA
6: // Updated 2/2015 by WP: Fixed swing GUI creation to use EDT.
7: // Updated to use Java 8 method reference.
8: // From original code by D. Liang (supplement to 9th ed of his book).
9:
10: package mypackage;
11:
12: import java.io.*;
13: import javax.swing.*;
14:
15: public class MyApplet extends JApplet {
16: public void init () {
17: // Create this JApplet's GUI on the event-dispatching thread:
18: try {
19: SwingUtilities.invokeAndWait( this::createGUI );
20: } catch ( Exception e ) {
21: System.err.println("createGUI didn't successfully complete");
22: }
23: }
24:
25: private void createGUI() {
26: JLabel label = new JLabel();
27: add( label );
28:
29: // The following code causes a security exception in an applet,
30: // even if signed, if it runs in the "sandbox". However, the
31: // user can grant a signed applet extra (all) permissions; in fact,
32: // that is the default for signed applets since Java 7U10.
33:
34: try {
35: File file = new File( "." );
36: label.setText( "The current directory is "
37: + file.getAbsolutePath() );
38: } catch ( Exception e ) {
39: e.printStackTrace();
40: label.setText(
41: "Security exception while attempting access to current directory" );
42: }
43: }
44: }