Question

我正在研究大学项目java MemoryCatcherServant.java，我收到此错误：

方法不会覆盖或实现超类型
中的方法

有人有修复吗？任何帮助肯定会受到赞赏。快速而准确的答案肯定会得到回报：）

@Override
public boolean purchaseMemoryPoints(int memoryPointAmount, int userId) {
    String error;
    Connection connection;
    Statement stmt = null;
    Statement stmt2 = null;
    int memoryPoints = 0;

    try {

        connection = DriverManager
        .getConnection("jdbc:mysql://localhost/memorycatcher","root", "root");


    } catch (SQLException e) {
        return false;
    }

    if (connection != null) {


        //make connection
        try {
            stmt = connection.createStatement();
            String sql = "SELECT userMemoryPoints FROM users WHERE userId = \""+userId+"\"";
            ResultSet rs = stmt.executeQuery(sql);

            while(rs.next())
            {

                memoryPoints = rs.getInt("userMemoryPoints");
            }

            rs.close();
            stmt.close();

            int newMemoryPoints = memoryPoints + memoryPointAmount;

            stmt2 = connection.createStatement();
            String sql2 = "UPDATE users SET userMemoryPoints = newMemoryPoints WHERE userId = \""+userId+"\"";

            stmt2.close();
            connection.close();

            return true;
        } catch (SQLException e) {
            //error handling
            return false;
        }

    } else {
        return false;
    }
}

购买memorycatcher的IDL

//user enters the amount of points they want to purchase
boolean purchaseMemoryPoints(in long memoryPointAmount, in long userId);

Answer 1

尝试删除@Override注释（第一行）作为开始。

如果您确定该方法确实覆盖了另一种方法，那么您的编译器可能会设置为古老的Java版本（在Java 1.6之前的接口中不允许使用@Override - 注释。）

Java：从超类型实现方法时出错

1 个答案: