
javax.measure.unit.package.html Maven / Gradle / Ivy
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Provides support for programatic unit handling.
Standart/NonStandard Units
Standard units and prefixes are provided by the
{@link javax.measure.unit.SI SI} class (Système International d'Unités) and
about 50 non-standard units are available through the
{@link javax.measure.unit.NonSI NonSI} class.
Usage examples:
[code]
import javax.measure.Scalar;
import javax.measure.Measure;
import javax.measure.unit.*;
import javax.measure.quantity.*;
import static javax.measure.unit.SI.*;
import static javax.measure.unit.NonSI.*;
import static javax.measure.unit.Dimension.*;
public class Main {
public void main(String[] args) {
// Conversion between units.
System.out.println(KILO(METRE).getConverterTo(MILE).convert(10));
// Retrieval of the system unit (identifies the measurement type).
System.out.println(REVOLUTION.divide(MINUTE).getSystemUnit());
// Dimension checking (allows/disallows conversions)
System.out.println(ELECTRON_VOLT.isCompatible(WATT.times(HOUR)));
// Retrieval of the unit dimension (depends upon the current model).
System.out.println(ELECTRON_VOLT.getDimension());
}
}
> 6.2137119223733395
> rad/s
> true
> [L]²·[M]/[T]²
[/code]
Unit Parameterization
Units are parameterized (<Q extends {@link javax.measure.quantity.Quantity Quantity}>) to
enforce compile-time checks of units/measures consistency, for example:[code]
Unit MINUTE = SECONDS.times(60); // Ok.
Unit MINUTE = METRE.times(60); // Compile error.
Unit HECTOPASCAL = HECTO(PASCAL); // Ok.
Unit HECTOPASCAL = HECTO(NEWTON); // Compile error.
Measurable duration = Measure.valueOf(2, MINUTE); // Ok.
Measurable duration = Measure.valueOf(2, CELSIUS); // Compile error.
long milliseconds = duration.longValue(MILLI(SECOND)); // Ok.
long milliseconds = duration.longValue(POUND); // Compile error.
[/code]
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