change the size of pane so that both the bars will get visible.

import java.sql.*;
import java.util.*;
import javax.swing.*; 

class JTableExample extends JFrame { 
    private static int offset = 50; 

    public JTableExample(int horizPolicy, int vertPolicy, String title) { 
    final Vector columnNames = new Vector();
    final Vector data = new Vector();
    JPanel panel=new JPanel();
    try{
    Class.forName("com.mysql.jdbc.Driver");
    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
    Statement st = con.createStatement();
    ResultSet rs= st.executeQuery("Select * from employee");
    ResultSetMetaData md = rs.getMetaData();
    int columns = md.getColumnCount();
    for (int i = 1; i <= columns; i++){
    columnNames.addElement(md.getColumnName(i));
    }
    while(rs.next()){
    Vector row = new Vector(columns);
    for (int i = 1; i <= columns; i++){
    row.addElement(rs.getObject(i));
    }
    data.addElement(row);
    }
   }
catch(Exception e){}
JTable table = new JTable(data, columnNames);

        setTitle(title); 
        offset += 50; 
        setLocation(offset,offset); 
        setSize(300,150); 
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); 
        JScrollPane scroll = new JScrollPane(table); 
        scroll.setHorizontalScrollBarPolicy(horizPolicy); 
        scroll.setVerticalScrollBarPolicy(vertPolicy); 
        getContentPane().add(scroll); 
    } 
    public static void main(String[] args) { 
     JTableExample f=new JTableExample(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED,JScrollPane. 
VERTICAL_SCROLLBAR_AS_NEEDED,"HORIZONTAL_SCROLLBAR_AS_NEEDED");
     f.setVisible(true);

    } 
}