Program to read the text from a file and display it on a JFrame.

import javax.swing.*;
import java.io.*;
import java.lang.*;
import java.awt.*;
class MegaViewer1 extends JFrame
{
    JTabbedPane jtp1=new JTabbedPane();
    JPanel jp1=new JPanel();
    JTextArea t1=new JTextArea();
    MegaViewer1() throws Exception
    {
        super("MegaViewer");
        FileReader f=new FileReader("Eight.java");
        BufferedReader brk=new BufferedReader(f);       
        String s;
        while((s=brk.readLine())!=null)
        t1.setText(s);
        jp1.add(t1);
        jtp1.addTab("Tab1",t1);
        add(jtp1);  
    }
    public static void main(String args[]) throws Exception
    {
        MegaViewer1 mv1=new MegaViewer1();
        mv1.pack();
        mv1.setVisible(true);   
        mv1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    }
}

The issue with this is only the last character is been displayed on the tabbed frame(i.e a "}"). Any suggestions ?

May 3, 2012 at 11:31 AM

Use append() method instead of setText().

Here is your modified code:

import javax.swing.*;
import java.io.*;
import java.lang.*;
import java.awt.*;
class MegaViewer1 extends JFrame
{
    JTabbedPane jtp1=new JTabbedPane();
    JPanel jp1=new JPanel();
    JTextArea t1=new JTextArea();
    MegaViewer1() throws Exception
    {
        super("MegaViewer");
        FileReader f=new FileReader("A.java");
        BufferedReader brk=new BufferedReader(f);       
        String s;
        while((s=brk.readLine())!=null){
        t1.append(s);
        }
        jp1.add(t1);
        jtp1.addTab("Tab1",t1);
        add(jtp1);  
    }
    public static void main(String args[]) throws Exception
    {
        MegaViewer1 mv1=new MegaViewer1();
        mv1.pack();
        mv1.setVisible(true);   
        mv1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    }
}