Example create enum in android annotation

ExampleUse.java

//Example
User user = new User();
user.age = Numbers.ONE;

Numbers.java

@IntDef({Numbers.ONE, Numbers.TWO, Numbers.THREE, Numbers.FOUR})
@Retention(RetentionPolicy.SOURCE)
@interface Numbers {
    int ONE = 1;
    int TWO = 2;
    int THREE = 3;
    int FOUR = 4;
}

NumbersWithoutAnnotation.java

enum NumbersWithoutAnnotation {
  ONE, TWO, THREE, FOUR;
}

User.java

class User {
  
 @Numbers
 int age;
  
}