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I defined my own custom annotation
@Target(value={ElementType.METHOD, ElementType.FIELD}) @Retention(RetentionPolicy.RUNTIME) public @interface MyCustomAnnotation { Class<?> myType(); } how, if at all, can I make the attribute optional
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@interface is used to create your own (custom) Java annotations. Annotations are defined in their own file, just like a Java class or interface. Here is custom Java annotation example: @interface MyAnnotation { String value(); String name(); int age(); String[] newNames(); }
Java Custom annotations or Java User-defined annotations are easy to create and use. The @interface element is used to declare an annotation. For example: @interface MyAnnotation{}
If an @Target meta-annotation is present, the compiler will enforce the usage restrictions indicated by ElementType enum constants, in line with JLS 9.7. 4. For example, this @Target meta-annotation indicates that the declared type is itself a meta-annotation type.
You can provide a default value for the attribute:
@Target(value={ElementType.METHOD, ElementType.FIELD}) @Retention(RetentionPolicy.RUNTIME) public @interface MyCustomAnnotation { Class<?> myType() default Object.class; } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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