java11-ORed-container

Showcase of ORed container.

Example: characteristics of Spliterator.

preface

It's not a proper way of programming, we provide it mainly for informational purpose and because of Spliterator's characteristics construction.

project description

We have a class Person, every person could have some characteristics. It is possible to implement it in a such way (using binary data and binary operations):

@Value
class Person {
    public final int characteristics;

    Person(int characteristics) {
        this.characteristics = characteristics;
    }

    public static final int OPEN_MINDED = 0x001;
    public static final int ATHLETIC = 0x004;
    public static final int INTELLIGENT = 0x010;

    boolean hasCharacteristics(int characteristics) {
        return (this.characteristics & characteristics) == characteristics;
    }
}

• we put characteristics linked with OR in a constructor, for example:

  new Person(Person.OPEN_MINDED | Person.INTELLIGENT | Person.ATHLETIC);
  

• we check if a given person has some characteristics:

  person.hasCharacteristics(Person.OPEN_MINDED)
  

• simply:
  • | is like a put to the set
  • & and then == is something like contains

tests

• BinaryArithmetic - we show why defined above operations are correct:
  • conversion from hex to binary
  • OR
  • AND
• PersonTest - we construct person with some characteristics and then check if hasCharacteristics is correct