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Displaying Source Code(s)
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Program to develop a Web Browser in Java.
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import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import javax.swing.event.*;
public class WebBrowser
{
public static void main(String [] args)
{
JFrame frame = new EditorPaneFrame();
frame.show();
}
}
class EditorPaneFrame extends JFrame
{
private JTextField url;
private JCheckBox editable;
private JButton loadButton;
private JButton backButton;
private JEditorPane editorPane;
private Stack urlStack = new Stack();
public EditorPaneFrame()
{
setTitle("Java Web Browser");
setSize(600,400);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
} );
// set up text field and load button for typing in URL
url = new JTextField(30);
loadButton = new JButton("Load");
loadButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
try
{
// remember URL for back button
urlStack.push(url.getText());
editorPane.setPage(url.getText());
}
catch(Exception e)
{
editorPane.setText("Error: " +e);
}
}
});
// set up back button and button action
backButton = new JButton("Back");
backButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
if(urlStack.size()<=1) return;
try
{
urlStack.pop();
String urlString = (String)urlStack.peek();
url.setText(urlString);
editorPane.setPage(urlString);
}
catch(IOException e)
{
editorPane.setText("Error : " +e);
}
}
});
editorPane = new JEditorPane();
editorPane.setEditable(false);
editorPane.addHyperlinkListener(new HyperlinkListener()
{
public void hyperlinkUpdate(HyperlinkEvent event)
{
if(event.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
{
try
{
urlStack.push(event.getURL().toString());
url.setText(event.getURL().toString());
editorPane.setPage(event.getURL());
}
catch(IOException e)
{
editorPane.setText("Error: " + e);
}
}
}
});
editable = new JCheckBox();
editable.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
editorPane.setEditable(editable.isSelected());
}
});
Container contentPane = getContentPane();
contentPane.add(new JScrollPane(editorPane), "Center");
JPanel panel = new JPanel();
panel.add(new JLabel("URL"));
panel.add(url);
panel.add(loadButton);
panel.add(backButton);
panel.add(new JLabel("Editable"));
panel.add(editable);
contentPane.add(panel,"South");
}
} |
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