The best practice of the "Measurement Unit API" framework in the Java class library
The best practice of the "Measurement Unit API" framework in the Java class library
Overview:
The measurement unit is a standard measurement used in calculation and representative physical quantities.The Java class library provides a framework called "Metering Unit API" for easy operation and conversion of metering units.This article will introduce the best practice of using the measurement unit API framework, and provide some Java code examples.
1. Introduce the API framework of the measurement unit
First, introduce the API framework of the unit in your Java project.You can achieve this purpose by adding the following dependencies to the pom.xml file:
<dependency>
<groupId>javax.measure</groupId>
<artifactId>unit-api</artifactId>
<version>1.0</version>
</dependency>
2. Create and use metering units
Using the measured unit API framework, you can easily define and use various measurement units.The following is an example:
import javax.measure.*;
import javax.measure.quantity.*;
public class MeasurementExample {
public static void main(String[] args) {
// Create a metering unit representing length
Unit<Length> meter = SI.METER;
// Create a metering unit that represents quality
Unit<Mass> kilogram = SI.KILOGRAM;
// Use the measurement unit for calculation and conversion
Quantity<Length> length = Quantities.getQuantity(10, meter);
Quantity<Mass> mass = Quantities.getQuantity(2, kilogram);
Quantity<Force> force = length.multiply(mass).asType(Force.class);
System.out.println ("Value of Power:" + Force.GetValue () + ", Unit:" + Force.getunit ());
}
}
In the above example, we use the static attributes provided by the `si` class to obtain the pre -defined metering unit, such as` si.meter` and `si.kilogram`.Then, we use the `Getquantity ()" method of the `Quantities` class to create the number of specified values and measurement units.Finally, we can calculate and convert, such as multiplication of length and quality, and forced the result to be converted into a metering unit.
After the program is executed, the result will be printed and output results: "Value of Power: 20.0, Unit: N".
3. Perform unit conversion
The measurement unit API also provides a simple way for unit conversion.The following is an example:
import javax.measure.*;
import javax.measure.quantity.*;
public class ConversionExample {
public static void main(String[] args) {
Quantity<Length> length = Quantities.getQuantity(10, SI.METER);
// Convert length from rice to centimeter
Quantity<Length> lengthInCm = length.to(SI.CENTIMETER);
System.out.println ("length is: + lengthincm.getvalue () +", unit: " + lengthincm.getunit ()););
}
}
In the above example, we convert the length from rice to centimeter, use the `to ()" method and specify the target measurement unit.After the program is executed, the printed output result: "length is: 1000.0, unit: CM".
in conclusion:
This article introduces the best practice of the "Metering Unit API" framework in the Java library.By using this framework, we can easily define, calculate, and transform the unit of measurement.I hope these examples can help you use the measured unit API framework in the Java project.
