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security manager warning

 
Greenhorn
Posts: 1
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Hi,
I am new to java programming. I got message security manager not installed when I try to open the html page from the applet on visual cafe 4.1. I cannot view applet on browser.
This is a worked example on sun.java site. Can anybody help me?
Thanks
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.URL;
import java.net.MalformedURLException;
public class ShowDocument extends Applet
implements ActionListener {
URLWindow urlWindow;
public void init() {
Button button = new Button("Bring up URL window");
button.addActionListener(this);
add(button);
urlWindow = new URLWindow(getAppletContext());
urlWindow.pack();
}
public void destroy() {
urlWindow.setVisible(false);
urlWindow = null;
}
public void actionPerformed(ActionEvent event) {
urlWindow.setVisible(true);
}
}
class URLWindow extends Frame
implements ActionListener {
TextField urlField;
Choice choice;
AppletContext appletContext;
public URLWindow(AppletContext appletContext) {
super("Show a Document!");
this.appletContext = appletContext;
GridBagLayout gridBag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
setLayout(gridBag);
Label label1 = new Label("URL of document to show:",
Label.RIGHT);
gridBag.setConstraints(label1, c);
add(label1);
urlField = new TextField("http://java.sun.com/", 40);
urlField.addActionListener(this);
c.gridwidth = GridBagConstraints.REMAINDER;
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1.0;
gridBag.setConstraints(urlField, c);
add(urlField);
Label label2 = new Label("Window/frame to show it in:",
Label.RIGHT);
c.gridwidth = 1;
c.weightx = 0.0;
gridBag.setConstraints(label2, c);
add(label2);
choice = new Choice();
choice.addItem("(browser's choice)"); //don't specify
choice.addItem("My Personal Window"); //a window named
//"My Personal Window"
choice.addItem("_blank"); //a new, unnamed window
choice.addItem("_self");
choice.addItem("_parent");
choice.addItem("_top"); //the Frame that contained this
//applet
c.fill = GridBagConstraints.NONE;
c.gridwidth = GridBagConstraints.REMAINDER;
c.anchor = GridBagConstraints.WEST;
gridBag.setConstraints(choice, c);
add(choice);
Button button = new Button("Show document");
button.addActionListener(this);
c.weighty = 1.0;
c.ipadx = 10;
c.ipady = 10;
c.insets = new Insets(5,0,0,0);
c.anchor = GridBagConstraints.SOUTH;
gridBag.setConstraints(button, c);
add(button);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent event) {
setVisible(false);
}
});
}

public void actionPerformed(ActionEvent event) {
String urlString = urlField.getText();
URL url = null;
try {
url = new URL(urlString);
} catch (MalformedURLException e) {
System.err.println("Malformed URL: " + urlString);
}
if (url != null) {
if (choice.getSelectedIndex() == 0) {
appletContext.showDocument(url);
} else {
appletContext.showDocument(url,
choice.getSelectedItem());
}
}
}
}
 
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