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This code can check whether a class is deprecated or not
@Deprecatedpublic classRetentionPolicyExample{
public static void main(String[] args){
boolean isDeprecated=false;
if(RetentionPolicyExample.class.getAnnotations().length>0){
isDeprecated= RetentionPolicyExample.class
.getAnnotations()[0].toString()
.contains("Deprecated");
}
System.out.println("is deprecated:"+ isDeprecated);
}
}
But, how can be checked if any variable is annotated as deprecated?
@DeprecatedStringvariable;
740
@Deprecated @Deprecated annotation indicates that the marked element is deprecated and should no longer be used. The compiler generates a warning whenever a program uses a method, class, or field with the @Deprecated annotation.
If annotations specify a retention policy of RUNTIME, then they can be queried at run time by any Java program through the use of reflection. Reflection is the feature that enables information about a class to be obtained at run time.
Using the @Deprecated Annotation To use it, you simply precede the class, method, or member declaration with "@Deprecated." Using the @Deprecated annotation to deprecate a class, method, or field ensures that all compilers will issue warnings when code uses that program element.
The @Deprecated annotation tells the compiler that a method, class, or field is deprecated and that it should generate a warning if someone tries to use it. That's what a deprecated class or method is. It's no longer relevant.
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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