Hey there,
I am trying to implement an annotation that will function similar to the javax.validation.constraints.NotNull but something that I can use with
Java SE.
I have the following annotation but it does not seem to work. Can you please take a look?
Here is the annotation:
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import java.lang.annotation.*;
/**
* Designates that a field, return value, argument, or variable is
* guaranteed to be non-null.
*/
@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.LOCAL_VARIABLE})
@Documented
@Retention(RetentionPolicy.CLASS)
public @interface NotNull {}
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Here is the class that will use it:
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public class UsingNotNull{
public void notNullMethod(@NotNull
String cadena){
System.out.println(cadena.trim());
}
public static void main(String... args){
String cadena = "it works!";
String cadenaNula = null;
UsingNotNull unn = new UsingNotNull();
unn.notNullMethod(cadenaNula);
}
}
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Thanks in advance for your help!
