How to add Vertical ScrollBar whenever text is exceded visible TextArea?

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class ChatClientGUI extends JFrame implements ActionListener
{
    JButton b1,b2;
    JTextArea ta1;
    JTextField tf;
	JComboBox jc;
	JMenuBar mb;
	JMenu f,h;
	JMenuItem q,a;
	JFrame f1;
	JScrollBar sb;

public ChatClientGUI()
    {
		f1=new JFrame();
        setTitle("Chat Client");
        
        b1=new JButton("Send");
        b2=new JButton("Quit");

ta1=new JTextArea(20,50);

tf=new JTextField(60);

mb=new JMenuBar();

f=new JMenu("File");
		h=new JMenu("Help");

q=new JMenuItem("Quit");
		a=new JMenuItem("About");

setJMenuBar(mb);
		mb.add(f);
		mb.add(h);
		f.add(q);
		h.add(a);

jc=new JComboBox();
		jc.addItem("Pradeep");
        jc.addItem("Kumar");
        jc.addItem("Raju");
        
        Container c=getContentPane();
        c.setLayout(new BorderLayout());
		JPanel p=new JPanel();
		p.setLayout(new GridLayout(3,1));
		p.add(b1);
		p.add(b2);
		p.add(jc);
		c.add(p,BorderLayout.EAST);
		c.add(ta1,BorderLayout.CENTER);
		c.add(tf,BorderLayout.SOUTH);

b1.addActionListener(this);
		b2.addActionListener(this);
		q.addActionListener(this);
		a.addActionListener(this);

JRootPane j=getRootPane();  
        j.setDefaultButton(b1);  
		
		setVisible(true);
        setSize(600,300);     
    }

public void actionPerformed(ActionEvent ae)
	{
		String s1=ae.getActionCommand();

if(s1.equals("Quit"))
		{
			System.exit(1);
		}

if(s1.equals("Send"))
		{
			String s2=tf.getText();

ta1.append(jc.getSelectedItem()+":"+s2+'\n');

tf.setText("");
		}

if(s1.equals("About"))
		{
			JOptionPane.showMessageDialog(f1,"This ChatClient is developed by me Pradeep...Hope u like it!!!");

}
		
	}

public static void main(String[] args) {
        
        ChatClientGUI c=new ChatClientGUI();
    }
    
}

Scrolling? That should be easy enough: look at this Java Tutorials page.

I got it but i want only vertical scrollbar & also it should be activated only if text is exceeded visible TextArea.

I thought you could specify which way those scroll panes scroll.

The JScrollPane API has setHorizontalScrollBarPolicy and setVeriticalScrollBarPolicy methods to do just that. The default is both horizontal and vertical "as needed"

First of all use "meaningful" variable names. Two character names are not meaningful.

i want only vertical scrollbar & also it should be activated only if text is exceeded visible TextArea.

That is the default behaviour when you add a JTextArea to a scrollpane.

I got it but

Post the code you used.