Hey Guy’s,
Long time no seen. Today I want to share with you Java helper class that I have designed for one of the projects I am working on. This class will be useful for you, if your application works with height and weight conversions, also if you need to calculate Body Mass Index.
My helper class has following functionality:
– Kg to Lb Converter
– Lb to Kg Converter
– BMI (Body Mass Index) Calculator and “Classificator“
– Feet to Cm Converter
– Cm to Feet Converter
Here is the class:
import java.text.DecimalFormat;
/**
* This class is used for any calculations connected with Weight and Height
* - KG to LB converter (and vice versa)
* - Feet to Cm converter (and vice versa)
* - BMI Calculation
*
*/
public class HeightWeightHelper {
/**
*
* @param value double that is formatted
* @return double that has 1 decimal place
*/
private double format ( double value) {
if ( value != 0){
DecimalFormat df = new DecimalFormat("###.#");
return Double.valueOf(df.format(value));
} else {
return -1;
}
}
/**
*
* @param lb - pounds
* @return kg rounded to 1 decimal place
*/
public double lbToKgConverter(double lb) {
return format(lb * 0.45359237 );
}
/**
*
* @param kg - kilograms
* @return lb rounded to 1 decimal place
*/
public double kgToLbConverter(double kg) {
return format(kg * 2.20462262);
}
/**
*
* @param cm - centimeters
* @return feet rounded to 1 decimal place
*/
public double cmToFeetConverter(double cm) {
return format(cm * 0.032808399 );
}
/**
*
* @param feet - feet
* @return centimeters rounded to 1 decimal place
*/
public double feetToCmConverter(double feet) {
return format(feet * 30.48 );
}
/**
*
* @param height in cm
* @param weight in kilograms
* @return BMI index with 1 decimal place
*/
public double getBMIKg (double height, double weight) {
double meters = height/100;
return format( weight / Math.pow(meters,2));
}
/**
*
* @param height in feet
* @param weight in pounds
* @return BMI index with 1 decimal place
*/
public double getBMILb (double height, double weight) {
int inch = (int)(height *12);
return format((weight*703) / Math.pow(inch, 2));
}
/**
*
* @param bmi (Body Mass Index)
* @return BMI classification based on the bmi number
*/
public String getBMIClassification (double bmi) {
if (bmi <= 0) return "unknown";
String classification;
if (bmi < 18.5) {
classification = "underweight";
} else if (bmi < 25) {
classification = "normal";
} else if (bmi < 30) {
classification = "overweight";
} else {
classification = "obese";
}
return classification;
}
}//end of class
P.S If you want to have JUnit tests for this class let me know, I have them too 🙂
Regards,
Anatoly
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Hey nice post
I would like to know how can i write code with the syntax highlighter in my blogs if you can help
use http://alexgorbatchev.com/SyntaxHighlighter/
i was asking how to do that in a wordpress.com blog
but i got it anyway.. but thanks for your reply 🙂
i was asking how to do that in a wordpress.com blog
but i got it anyway.. but thanks for your reply 🙂
Sorry Ankit, I haven’t seen your comment! Here is the link on how to do it: http://en.support.wordpress.com/code/posting-source-code/
Thanks 🙂
I am using standard web hosting provided by Word Press 🙂
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