Comparative evaluation of the measurement unit API framework and other framework in the Java class library

The measurement unit is a unit that measures certain physical quantities.In the Java class library, there are some API frameworks that can be used to deal with measurement units, and provide convenient methods to convert and calculate the value between different units.This article will compare these frameworks. 1. The flexibility of the unit conversion: -JScience: JScience provides a wealth of measurement units, and can make complex unit conversion.For example, the speed can be converted from rice/second to kilometer/hour or miles/h. import javax.measure.Quantity; import javax.measure.Unit; import tech.units.indriya.quantity.Quantities; import tech.units.indriya.unit.Units; Quantity<Length> length = Quantities.getQuantity(10, Units.METRE); Quantity<Speed> speed = Quantities.getQuantity(10, Units.METRE_PER_SECOND); Quantity<Speed> convertedSpeed = speed.to(Units.KILOMETRES_PER_HOUR); System.out.println(convertedSpeed.toString()); // Output: 36 km/h -JSR 363 (Units of Measurement API): JSR 363 provides almost all international measurement units and allows users to customize units. import javax.measure.Quantity; import javax.measure.Unit; import javax.measure.UnitConverter; import javax.measure.quantity.Length; import javax.measure.quantity.Speed; import tec.units.ri.quantity.Quantities; import tec.units.ri.unit.MetricPrefix; import tec.units.ri.unit.Units; import tec.uom.se.format.SimpleUnitFormat; Unit<Speed> metersPerSecond = Units.METRE_PER_SECOND; Quantity<Speed> speed = Quantities.getQuantity(10, metersPerSecond); Quantity<Speed> convertedSpeed = speed.to(MetricPrefix.KILO(Units.KILOMETRE_PER_HOUR)); System.out.println(convertedSpeed.toString()); // Output: 36 km/h 2. The convenience of calculation: -JScience: JScience provides some built -in mathematical fortunes, which can directly calculate the measurement unit.For example, two lengths can be added or multiplied directly. import javax.measure.Quantity; import javax.measure.quantity.Length; import tech.units.indriya.quantity.Quantities; import tech.units.indriya.unit.Units; Quantity<Length> length1 = Quantities.getQuantity(10, Units.METRE); Quantity<Length> length2 = Quantities.getQuantity(20, Units.METRE); Quantity<Length> sum = length1.add(length2); Quantity<Length> product = length1.multiply(2); System.out.println(sum.toString()); // Output: 30 m System.out.println(product.toString()); // Output: 20 m -JSR 363 (Units of Measurement API): JSR 363 provides some convenient ways to calculate, such as `add ()`, `subtract (),` multiply (), `divide ()`, etc. import javax.measure.Quantity; import javax.measure.quantity.Length; import tec.units.ri.quantity.Quantities; import tec.units.ri.unit.MetricPrefix; import tec.units.ri.unit.Units; Quantity<Length> length1 = Quantities.getQuantity(10, Units.METRE); Quantity<Length> length2 = Quantities.getQuantity(20, Units.METRE); Quantity<Length> sum = length1.add(length2); Quantity<Length> product = length1.multiply(2); System.out.println(sum.toString()); // Output: 30 m System.out.println(product.toString()); // Output: 20 m 3. Performance and stability: -JScience: JScience is a mature framework. After a long period of development and testing, performance and stability are more reliable. -JSR 363 (Units of Measurement API): JSR 363 is a new framework. Although there are already some release versions, there may still be some potential performance and stability issues. Based on the above comparison evaluation, the appropriate measurement unit API framework can be selected according to specific needs.If you need more measurement unit support and flexible conversion functions, you can choose JSCIENCE.If you pay more attention to standardization and the latest specifications of cross -platform, you can choose JSR 363.Depending on the specific needs, choosing a suitable framework can improve development efficiency and reduce errors.