Extracting Metadata of database

import java.sql.*;
import java.io.*;
public class JavaDemo127{
    public static void main(String ar[])throws Exception{
        ResultSet rs=null;
        Class.forName("oracle.jdbc.driver.OracleDriver");
        Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:test","system","123456");
        DatabaseMetaData md=con.getMetaData();
        String s[]={"TABLE"};
        rs=md.getTables(null,"TEST",null,s);
        while(rs.next()){
            System.out.println(rs.getString(1));
        }
        System.out.println("  Schemas         ");
        rs=md.getSchemas();
        while(rs.next()){
            System.out.println(rs.getString(1));
        }
       
        System.out.println("              Catalog ");
        rs=md.getCatalogs();
        while(rs.next()){
            System.out.println(rs.getString(1));
        }

        System.out.println("            Tables type ");
        rs=md.getTableTypes();
        while(rs.next()){
            System.out.println(rs.getString(1));
        }
    }
}