CallableStatement cstm = conn.prepareCall("{ call p_test.get_city_bank(?) }");
cstm.registerOutParameter( 1 , OracleTypes.CURSOR);
cstm.execute();
ResultSet rs = (ResultSet) cstm.getObject( 1 );
 if (rs.next()) {
  ResultSet sub_rs = (ResultSet) rs.getObject("bank_info");
   if (sub_rs.next()) {
    ...
  }
}

 import  oracle.jdbc.OracleTypes;

 import  java.sql.*;

 public   class  CallableStatementTest {

   private   static   final  String USERNAME = "scott";
   private   static   final  String PASSWORD = "tiger";
   private   static   final  String URL = "jdbc:oracle:thin:@192.168.170.90:1521:CVPROC";

   public   static   void  main(String args [])
     throws  SQLException {
    DriverManager.registerDriver( new  oracle.jdbc.OracleDriver());
    Connection con =  null ;
    CallableStatement cst =  null ;
    ResultSet rs =  null ;

    String query =
      "begin\n" +
      "  open ? for\n" +
      "    select dname\n" +
      "         , cursor(select ename from scott.emp where emp.deptno=dept.deptno) emp\n" +
      "    from scott.dept\n" +
      "    where deptno = ?;\n" +
      "end;";

     try  {
      con = DriverManager.getConnection(URL, USERNAME, PASSWORD);
      cst = con.prepareCall(query);

      cst.registerOutParameter( 1 , OracleTypes.CURSOR);
      cst.setInt( 2 ,  30 );
      cst.execute();

      rs = (ResultSet) cst.getObject( 1 );
       while  (rs.next()) {
        System.out.println(rs.getString("dname"));
        ResultSet rs2 =  null ;
         try  {
          rs2 = (ResultSet) rs.getObject("emp");
           while  (rs2.next()) {
            System.out.print("   " + rs2.getString("ename"));
          }
          System.out.println();
        }  finally  {
           if  (rs2 !=  null ) {rs2.close();}
        }
      }
    }  finally  {
       if  (rs !=  null ) {rs.close();}
       if  (cst !=  null ) {cst.close();}
       if  (con !=  null ) {con.close();}
    }
  }
}