I am a student and I am having troubles having my program read all the lines in a text file when I enter it into the program that has my GUI, it will only display the last line. I got it working on console and it works great and displays every line. Can anyone help?
here is the code that works in Console
String parent = "D:\\Online Class\\Java Programs\\Final Project\\Tests\\";
Scanner fileInput = new Scanner(System.in);
System.out.print("Enter Name of File: ");
String name= fileInput.nextLine();
String extension = ".txt";
String fileName = (parent+name+extension);
//reads file and displays it
String line = null;
try{
FileReader fileReader = new FileReader(fileName);
BufferedReader bufferedReader = new BufferedReader(fileReader);
while((line = bufferedReader.readLine()) !=null)
{
System.out.println(line);
}
bufferedReader.close();
}
catch(FileNotFoundException ex)
{
System.out.println("Unable to open file '" + fileName + "'");
}
catch(IOException ex)
{
System.out.println("Error Reading file '"+fileName + "'");
}
}
and here is the code that does not work when I enter it to the program with the GUI
//search for file (must be in same folder as program)
String parent = "D:\\Online Class\\Java Programs\\Final Project\\Tests\\";
String fileInput = taskNameTextField.getText();
String name = fileInput;
String extension = ".txt";
String fileName = (parent+name+extension);
//reads file and displays it
String line = null;
try{
FileReader fileReader = new FileReader(fileName);
BufferedReader bufferedReader = new BufferedReader(fileReader);
while((line = bufferedReader.readLine()) !=null)
{
System.out.println(line);
}
bufferedReader.close();
}
catch(FileNotFoundException ex)
{
System.out.println("Unable to open file '" + fileName + "'");
}
catch(IOException ex)
{
System.out.println("Error Reading file '"+fileName + "'");
}
}
Here is the full code for the GUI that is acting up:
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.*;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.File;
import java.io.*;
import java.util.Scanner;
public class readGUItest implements ActionListener
{
JFrame window = new JFrame("Task");
JTextField taskNameTextField = new JTextField();
JTextArea DescriptTextArea = new JTextArea();
JLabel taskNameLabel = new JLabel("Task Name");
JLabel descriptLable = new JLabel("Description");
JButton save = new JButton("save");
public static void main(String[] args)throws IOException
{
readGUItest tGt = new readGUItest();
}
public readGUItest()
{
window.add(taskNameLabel);
window.add(taskNameTextField);
window.add(descriptLable);
window.add(DescriptTextArea);
window.add(save);
save.addActionListener(this);
window.setSize(new Dimension(200,300));
window.setLayout(new GridLayout(3,3));
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setVisible(true);
}
public void actionPerformed(ActionEvent event)
{
//search for file (must be in same folder as program)
String parent = "D:\\Online Class\\Java Programs\\Final Project\\Tests\\";
String fileInput = taskNameTextField.getText();
String name = fileInput;
String extension = ".txt";
String fileName = (parent+name+extension);
String line = null;
try{
FileReader fileReader = new FileReader(fileName);
BufferedReader bufferedReader = new BufferedReader(fileReader);
while((line = bufferedReader.readLine()) !=null)
{
DescriptTextArea.setText(line);
}
bufferedReader.close();
}
catch(FileNotFoundException ex)
{
DescriptTextArea.setText("Unable to open file '" + fileName + "'");
}
catch(IOException ex)
{
DescriptTextArea.setText("Error Reading file '"+fileName + "'");
}
}
}
You are using setText
on the DescriptTextArea
, which replaces the previous contents of the widget.
You could rather use the document of the JTextField
instead like this:
DescriptTextArea.getDocument().insertString(
DescriptTextArea.getDocument().getEndPosition().getOffset(),
line + System.getProperty("line.separator"),
null);
This inserts the new line at the end of the document and appends a line separator.