JDBC查詢MySql只顯示序號為偶數的記錄的原因

這是一段JDBC查詢資料庫的例子，奇怪的是，執行下來，只能查詢到序號為偶數的記錄。例如：資料庫中有兩條符合要求的資料，只能查詢到第二條，

有四條符合要求的資料，只能查詢到第二條、第四條，依此類推。。 

public ArrayList<Task> getPTask1(int userId) {  try {   ArrayList<Task> al = new ArrayList<Task>();   pstmt = (PreparedStatement) ct     .prepareStatement("select * from task where receiverID = ? and publisherID = ? and remark = 2");   pstmt.setInt(1, userId);   pstmt.setInt(2, userId);   ResultSet rs = (ResultSet) pstmt.executeQuery();   while (rs.next()) {    System.out.println(rs.next());    Task task = new Task();    task.setTaskId(rs.getInt(1));    task.setTopic(rs.getString(2));    task.setContent(rs.getString(3));    task.setAddition(rs.getBlob(4));    task.setUserByPublisherId(this.getUById(rs.getInt(5)));    task.setUserByReceiverId(this.getUById(rs.getInt(6)));    task.setDate(rs.getString(7));    task.setRemark(rs.getInt(8));    task.setLevel(rs.getString(9));    task.setAord(rs.getString(10));    task.setReason(rs.getString(11));    task.setDegree(rs.getString(12));    task.setAddName(rs.getString(13));    al.add(task);    System.out.println("task4Content:" + task.getContent());   }   return al;  } catch (Exception e) {   e.printStackTrace();   return null;  }

最後得知，原因是：

rs.next每執行一次，指標移動一行。所以，將System.out.println(rs.next());注釋掉後，就會正常了。