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/*

Francis Hinson, Binley Yang, Hiroyuki Asaga

Lab20.java, Lab20JFile.java, Lab20JFileTest.java, tester.txt

*/

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.ObjectOutputStream;

import java.util.Iterator;

import java.util.NoSuchElementException;

import java.util.Random;

import java.util.Scanner;

import javax.swing.*;

import sun.misc.IOUtils;

import java.awt.*;

import java.awt.event.*;

public class Lab20JFile extends JFrame {

private JTextArea outputArea;

private JScrollPane scrollPane;

private Scanner file;

public Lab20JFile() throws IOException {

super( "Testing class File" );

outputArea = new JTextArea();

scrollPane= new JScrollPane(outputArea);

add( scrollPane, BorderLayout.CENTER ); // add scrollPane to GUI

setSize( 400, 400 ); // set GUI size

setVisible( true ); // display GUI

}

private File getFile() {

JFileChooser chooser = new JFileChooser();

chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

int result = chooser.showOpenDialog(this);

if (result == JFileChooser.CANCEL_OPTION){

System.exit(1);

}

File name = chooser.getSelectedFile();

if((name == null) || (name.getName().equals(""))) {

JOptionPane.showMessageDialog(this, "Invalid Name", "Invalid Name", JOptionPane.ERROR_MESSAGE);

System.exit(1);

}

return name;

}

public void readFile() throws IOException{

File name = getFile();

if(name.exists()) {

outputArea.setText(read(name));

}

}

public static String read(File file) throws IOException {

int len;

char[] chr = new char[4096];

final StringBuffer buffer = new StringBuffer();

final FileReader reader = new FileReader(file);

try {

while ((len = reader.read(chr)) > 0) {

buffer.append(chr, 0, len);

}

} finally {

reader.close();

}

return buffer.toString();

}

}