Java method to assign object field values with Reflection

Question

I was wondering whether it would be possible to have something like the following in Java:

public class MyClass {
    private String name;
    private Intege         


        

Answer 1

I'd like to suggest a map instead of List<T>.

 for(Map.Entry<String,Object> entry:map.entrySet())
  {
    Field aField = anObject.getClass().getDeclaredField(entry.getKey());
    if(entry.getValue().getClass().equals(aField.getType()))
         aField.set(anObject,entry.getValue());
  }
return anObject;

Answer 2

Sure:

aField.set(this, aValue);

To do type checking first:

if (!aField.getType().isInstance(aValue))
    throw new IllegalArgumentException();

but since calling set with a value of the wrong type will generate an IllegalArgumentException anyway, that sort of check isn't very useful.

Answer 3

Though I'm at a loss as to why you would want to do it like that (since you already have getters and setters), try this:

Field aField = getClass().getDeclaredField(aFieldName);
aField.set(this, aValue);

For more info, see this.