Java - map a list of objects to a list with values of their property attributes

Question

I have the ViewValue class defined as follows:

class ViewValue {

private Long id;
private Integer value;
private String description;
private View view;
priv         


        

Answer 1

You could do it in a one-liner using Commons BeanUtils and Collections:
(why write your own code when others have done it for you?)

import org.apache.commons.beanutils.BeanToPropertyValueTransformer;
import org.apache.commons.collections.CollectionUtils;

...

List ids = (List) CollectionUtils.collect(viewValues, 
                                       new BeanToPropertyValueTransformer("id"));