Question

In short,
I want to do something like

MyObject myObject;

public String getField (String fieldName) {
return myObject.fieldName; // how could I do this since fieldName is a String?
}

Background:

I am getting data from the database using a stored procedure.

The stored procedure basically gets all the columns. But I want the user to choose which column to display in the table.

In the Hibernate object, I have all the fields corresponding to the resultset returned by the stored procedure.

With the list of fields (Strings) that the user wants, is there a way to display the value of the corresponding field in the Hibernate object given the field name?

Answer 1

You can access it using reflection:

public static Object getField(Object target, String fieldName) throws Exception {
    return target.getClass().getDeclaredField(fieldName).get(target);
}

In your case, you’d just use:

myObject.getClass().getDeclaredField(fieldName).get(myObject);

Here’s a little test of the code:

static class A {
    int x = 1;
}

public static void main(String[] args) throws Exception {
    System.out.println(getField(new A(), "x"));
}

Output:

1