If I use a singleton class for a database connection, can one user close the connection for everybody?

Question

I wrote a singleton class for obtaining a database connection.

Now my question is this: assume that there are 100 users accessing the application. If one user closes

Answer 1

package es.sm2.conexion;

    import java.sql.Connection;
    import java.sql.DriverManager;

    public class ConexionTest {
        private static Connection conn = null;

        static Connection getConnection() throws Exception {
            if (conn == null) {
                String url = "jdbc:mysql://localhost:3306/";
                String dbName = "test";
                String driver = "com.mysql.jdbc.Driver";
                String userName = "userparatest";
                String password = "userparatest";

                Class.forName(driver).newInstance();
                conn = DriverManager.getConnection(url + dbName, userName, password);
            }

            return conn;
        }
    }

To close Connection

public static void closeConnection(Connection conn) {

        try {

            conn.close();

        } catch (SQLException e) {

        }

    }

To call to the connection:

package conexion.uno;

import java.sql.*;

import es.sm2.conexion.ConexionTest;

public class LLamadorConexion {

    public void llamada() {
        Connection conn = null;
        PreparedStatement statement = null;
        ResultSet resultado = null;
        String query = "SELECT * FROM empleados";

        try {
            conn = ConexionTest.getConnection();
            statement = conn.prepareStatement(query);
            resultado = statement.executeQuery();

            while (resultado.next()) {
                System.out.println(resultado.getString(1) + "\t" + resultado.getString(2) + "\t" + resultado.getString(3) + "\t" );
            }
        } 
        catch (Exception e) {
            System.err.println("El porque del cascar: " + e.getMessage());
        } 
        finally {
            ConexionTest.closeConnection(conn);

        }
    }
}