java抛出检查异常？

Question

我很确定之前有效,但是eclipse说它在抛出线上有错误.

 try{}
}catch(Exception e){
    throw e;    }

在我的旧学生项目中,我写道:

 try {
        Class.forName("org.postgresql.Driver");
        this.connection = DriverManager.getConnection(
                DataSource.getURL(), DataSource.getUserName(), DataSource.getPassword());
    } catch (ClassNotFoundException e) {
        System.out.println("Could not find driver to connect to database. Please make"
                + "sure the correseponding postgreSQLjdbc library is added.");
        throw e;

    } catch (SQLException e) {
        System.out.println("Username or password is not correct");
        throw e;
    }

它很完美.

只有这种类型有效,但它不是我想要的

 throw new UnsupportedAddressTypeException();

Answer 1

想必你的方法是宣布抛出UnsupportedAddressTypeException,但不SQLException和ClassNotFoundException.只能从声明它们抛出这些异常或超类的方法抛出已检查的异常(包括重新抛出现有的异常).