Get value of static field from Class

java, reflection, static

Solution

Try with reflection

Steps to follow:

- First retrieve the declared field of the class using its variable name

- Check the type of the returned field

- Then call corresponding method on Field to get the field value

Sample code:

ArrayList<Class<? extends A>> list = new ArrayList<Class<? extends A>>();
list.add(B.class);
list.add(A.class);


// get the value of first class stored in array
Field f = list.get(0).getDeclaredField("i");
Class<?> t = f.getType();
if (t == int.class) {
    System.out.println(f.getInt(null));
}

EDIT

As per @Sotirios Delimanolis comments you can get the value directly without checking field type and mathod`Field#getX()` as shown below but it will return `Object` instead of primitive `int`.

Field f = list.get(0).getDeclaredField("i");
System.out.println(f.get(null));

Problem

``` abstract class A { static int i = 5; } class B extends A { static int i = 6; } class C extends A { static int i = 7; } ``` Now I have an `ArrayList<Class<? extends A>>`. How can I get the value of the static field from an `Class<? extends A>`?

Original source