How to test whether the value of a Java field gotten by reflection is null?

Question

I have

Field f = this.getClass().getFields()[0];

I need to know if f\'s value in this is null or not

Answer 1

field.get(target) returns Object. So you can checkif (field.get(this) == null) {..}

If the field is primitive, it will get wrapped. int -> Integer, char -> Character, etc.

Answer 2

You need to get the field from the object then check if it is null

Field f = this.getClass().getFields()[0];
if (f.get(this) == null)
  ...

Answer 3

You didn't search well enough: http://download.oracle.com/javase/6/docs/api/java/lang/reflect/Field.html#get%28java.lang.Object%29

Call this method, and check if the returned object is null.

Answer 4

use Object obj=f.get(this) and check whether the returned object(in this case obj) is null or not