Java Annotations - Creating Annotation Examples

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface DateFormat {
    String value ();
}

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.SOURCE)
public @interface AutoImplement {
    /**
     * The name of the implementation that will be generated. It should be a
     * valid/unique java qualifier name
     * @return
     */
    String as();

    /**
     * If true a corresponding builder (based on builder design pattern)
     * is also generated.
     * @return
     */
    boolean builder() default false;
}

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.SOURCE)
public @interface Mandatory {
}

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface AddressFormat {

    AddressFormatter.Style style () default AddressFormatter.Style.FULL;
}

    @Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER})
    @Retention(RetentionPolicy.RUNTIME)
    public @interface LocaleFormat {
        LocaleStyle style () default LocaleStyle.CountryDisplayName;
    }

    public enum LocaleStyle {
        CountryDisplayName,
        ISO3Country,
        ISO3Language;
    }

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {
}