public static void main(String[] args) throws Throwable { JDBCUtil jdbc=new JDBCUtil(); jdbc.getConnection(); jdbc.getConnection(); }public void getConnection() { Connection conn = null; try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection(URL, USER, PASSWORD); System.out.println(conn); } catch (SQLException | ClassNotFoundException e) { e.printStackTrace(); }finally{ try { if(conn!=null) conn.close(); } catch (SQLException e) { e.printStackTrace(); }finally{ System.out.println(conn); } } }

com.mysql.jdbc.JDBC4Connection@446cdf90com.mysql.jdbc.JDBC4Connection@446cdf90com.mysql.jdbc.JDBC4Connection@1de0aca6com.mysql.jdbc.JDBC4Connection@1de0aca6