Loop over all fields in a Java class

Question

I have a Java class that has a number of Fields.

I would like to Loop over al lthe fields and do something for the one\'s that are null.

For ex

Answer 1

What are looking for is called reflection. Reflection lets you look at your own class, or another class to see what it is made of. Java has reflection built in, so you can use it right away. Then you can do stuff like -

for(Field f : ClasWithStuff.getFields()){
    System.out.println(f.getName());//or do other stuff with it
}

You can also use this to get methods, constructors, etc, to do similar and cooler stuff.