Hernán Eche Hernán Eche - 1 year ago 34
Java Question

How to determine (at runtime) if a variable is annotated as deprecated?

This code can check whether a class is deprecated or not


public class

public static void main(String[] args){
boolean isDeprecated=false;
isDeprecated= RetentionPolicyExample.class
System.out.println("is deprecated:"+ isDeprecated);

But, how can be checked if any variable is annotated as deprecated?



Answer Source
import java.util.stream.Stream;

Field[] fields = RetentionPolicyExample.class // Get the class
                .getDeclaredFields(); // Get its fields

boolean isAnyDeprecated = Stream.of(fields) // Iterate over fields
                // If it is deprecated, this gets the annotation.
                // Else, null
                .map(field -> field.getAnnotation(Deprecated.class))
                .anyMatch(x -> x != null); // Is there a deprecated annotation somewhere?
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