<dependency> <groupId>javax.measure</groupId> <artifactId>unit-api</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>javax.measure</groupId> <artifactId>unit-ri</artifactId> <version>1.1</version> </dependency> UnitOfMeasure<Length> meter = new BaseUnit<>("m", Length.class); Measurable<Length> length = QuantityFactory.create(10, meter); Measurable<Length> doubledLength = length.times(2); Measurable<Length> length1 = QuantityFactory.create(10, meter); Measurable<Length> length2 = QuantityFactory.create(5, meter); Measurable<Length> sum = length1.plus(length2); Measurable<Length> difference = length1.minus(length2); Measurable<Length> product = length1.times(2); Measurable<Length> quotient = length1.divide(2);