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using @ symbol in java

@Target(basically location of your annotation : It can be method,class,variable etc ..)
@Retention(basically tells the life time of your annotation : It can be compile time , class loading time or Runtime).
public @interface yourannotationname{

String yourattribute() default yourdefaultvalue;
Integer yourattribute() default yourdefaultvalueifany

}

After this you need to write a separate parser class which actually looks for the annotation in your class and provide you the respective functionality.