Polymorphism - Java Software Solutions: Foundations of Program Design - page 523

LISTING 10.13
//********************************************************************
// DisplayFile.java Author: Lewis/Loftus
//
// Demonstrates the use of a file chooser and a text area.
//********************************************************************
import java.util.Scanner;
import java.io.*;
import javax.swing.*;
public class DisplayFile
{
//-----------------------------------------------------------------
// Opens a file chooser dialog, reads the selected file and
// loads it into a text area.
//-----------------------------------------------------------------
public static void main (String[] args) throws IOException
{
JFrame frame = new JFrame ("Display File");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
JTextArea ta = new JTextArea (20, 30);
JFileChooser chooser = new JFileChooser();
int status = chooser.showOpenDialog ( null );
if (status != JFileChooser.APPROVE_OPTION)
ta.setText ("No File Chosen");
else
{
File file = chooser.getSelectedFile();
Scanner scan = new Scanner(file);
String info = "";
while (scan.hasNext())
info += scan.nextLine() + "\n";
ta.setText (info);
}
frame.getContentPane().add (ta);
frame.pack();
frame.setVisible( true );
}
}