This field is declared in the class “Test”, here is the method that let us modify this const variable : public static void changePiValue ( double newValue ) Let’s imagine you want to modify the value of the following field: // We won't test directly on Math.PI because it's a primitive var (double) // => so the JVM inlined it private static final Double PI = Double. Although it is illegal for a static initializer to access a static field of the same class whose declaration occurs lexically later 9, the compiler check for.
JAVA REFLECTION GET STATIC FIELD CODE
Using basic Java code it’s impossible to change this value, you have to use Java Reflection API. Great Learning Team Great Learnings Blog covers the latest developments and innovations in technology that can be leveraged to build rewarding careers. It was initialized once when this class has been loaded, then it wasn’t modifiable anymore. Java Reflection API helps to inspect interfaces, methods, classes at runtime without any prior information of their internals by compile time.
You actually have no need for this private static class since Reflection gives you direct access to methods and method signatures, as you'll see in my modified version of your code below. For example, in our Temperature class there is. Your class name should really be a more descriptive noun.
I had to do this because this field was initialized by a JVM argument. A static field is one that is shared by all instances of the class, and it is declared with the static keyword. Previously I was working on a project with a lot of legacy code, one of my goals was to test parts of the “API”, in some cases I had to change the value of a “private static final” field. When a method uses reflection to access class members (that is, uses the APIs belonging to the package), the reflection uses the same.
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