在Java（7）中，如何获取带注释的字段的值

Question

I have a class with fields on which some are annotated with a custom annotation. i have a method that needs to retreive the value of those fields in an instantiated class:

public void displayStringValue(Row row)
    for (Field field : Row.class.getDeclaredFields()) {
        SomeAnnotation annotatedElement = field.getAnnotation(SomeAnnotation.class);
        if (annotatedElement != null) {
            row.getValue(field.getName()); // What to do here in stead of this?
        }
    }
}

Obviously, row.getValue(String fieldname); does not exist. Here i need to find a way of getting the value of that field in row.

Answer 1

You want to Field#get() the value of the field for the given Row object?

field.setAccessible(true);
Object fieldValue = field.get(row); // or cast it if you know the type

setAccessible(..) is necessary if the field is not visible from the calling class.