Java - Access Class Variable

Asked Jul 23 '18 at 19:07

Active Jul 23 '18 at 19:14

Viewed 1,490 times

I was wondering how I would access a Class variable from within a method where I have gotten the Class as an argument. Like this:

Method

public void someMethod(Class<? extends SomeClass> clazz) {
     System.out.println(clazz.var);
}

Class

class SomeClass {
    public static String var = "Hello World!";
}

The part class.var doesn't work as expected. If an extending Class changes the value of var I want this value to be written out instead.

EDIT: This question is not answered by this question. I need to access a class variable not a private one.

edited Jul 23 '18 at 19:13

asked Jul 23 '18 at 19:07

Ivar Eriksson

3

As a side note, `class` cannot be used as a variable name. It is a keyword in the language. – Logan Jul 23 '18 at 19:10
@Logan you are absolutely right! – Ivar Eriksson Jul 23 '18 at 19:11
1

Popular choices are `clazz` and `klass`. – Logan Jul 23 '18 at 19:12
@Logan You don't have any ideas as how to resolve my problem? – Ivar Eriksson Jul 23 '18 at 19:27
Look at the questions that yours was marked as a duplicate of. You’ll have to use the `Field` class and `Class`’s `getDeclaredField()` method. – Logan Jul 23 '18 at 19:30
@Logan But what if I don't have an instance of the `Class` and only the `Class` itself? – Ivar Eriksson Jul 23 '18 at 19:44
You can invoke the method by coding `ClassName.class.getDeclaredField("fieldName")`. `.class` gives you access to the class’s `Class` instance. – Logan Jul 23 '18 at 19:46
@Logan I'm sorry but I don't understand. Would you mind writing a full answer to my post? – Ivar Eriksson Jul 23 '18 at 19:51
I’m not able to anymore. Read the answers marked above. They outline exactly what you need to do. – Logan Jul 23 '18 at 20:08

0 Answers0