java--Custom Annotations

Java annotations generally fall into three main categories:

1. Marking annotations

2. Tag meta annotations

3. General Notes

where 1. Tag annotations include

One override: Overriding methods in the superclass

Two Deprecated: Discarded classes

Three suppresswarings: Suppresses the compiler from issuing specific warnings

2. Tag meta annotations

A Generate: Identifies the source code generated by the computer

3. General Notes

A @Inherited tag inheritance relationship
Goal of the two @Target labeling
Three @Documented//Mark Generation Javadoc
Four @Retention (retentionpolicy.runtime)//lifetime of annotations

Instance:

1 Importjava.lang.annotation.Documented;2 Importjava.lang.annotation.Retention;3 ImportJava.lang.annotation.RetentionPolicy;4 5 //@Inherited Tag Inheritance relationships6 //@Target The target of the callout7@Documented//tag Generation Javadoc8@Retention (Retentionpolicy.runtime)//lifetime of the annotations9  Public@InterfacePerson {Ten String name (); One String Age (); A}

Called, where reflection is used

1 Importjava.lang.annotation.Documented;2 Importjava.lang.annotation.Retention;3 ImportJava.lang.annotation.RetentionPolicy;4 5 //@Inherited Tag Inheritance relationships6 //@Target The target of the callout7@Documented//tag Generation Javadoc8@Retention (Retentionpolicy.runtime)//lifetime of the annotations9  Public@InterfacePerson {Ten String name (); One String Age (); A}

java--Custom Annotations