initial project

.gitignore

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+*.db
+##############################
+## Java
+##############################
+.mtj.tmp/
+*.class
+*.jar
+*.war
+*.ear
+*.nar
+hs_err_pid*
+
+##############################
+## Maven
+##############################
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+pom.xml.bak
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+
+##############################
+## Gradle
+##############################
+bin/
+build/
+.gradle
+.gradletasknamecache
+gradle-app.setting
+!gradle-wrapper.jar
+
+##############################
+## IntelliJ
+##############################
+out/
+.idea/
+.idea_modules/
+*.iml
+*.ipr
+*.iws
+
+##############################
+## Eclipse
+##############################
+.settings/
+bin/
+tmp/
+.metadata
+.classpath
+.project
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.loadpath
+.factorypath
+
+##############################
+## NetBeans
+##############################
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+nbactions.xml
+nb-configuration.xml
+
+##############################
+## Visual Studio Code
+##############################
+.vscode/
+.code-workspace
+
+##############################
+## OS X
+##############################
+.DS_Store

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.javafanatics</groupId>
+  <artifactId>healty-coder</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.7.1</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>

src/main/java/com/javafanatics/BMICalculator.java

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+package com.javafanatics;
+
+import java.util.Comparator;
+import java.util.List;
+
+public class BMICalculator {
+	
+	private static final double BMI_THRESHOLD = 25.0;
+
+	public static boolean isDietRecommended(double weight, double height) {
+		if (height == 0.0) throw new ArithmeticException();
+		double bmi = weight / (height * height);
+		if (bmi < BMI_THRESHOLD)
+			return false;
+		return true;
+	}
+
+	public static Coder findCoderWithWorstBMI(List<Coder> coders) {
+		return coders.stream().sorted(Comparator.comparing(BMICalculator::calculateBMI))
+				.reduce((first, second) -> second).orElse(null);
+	}
+
+	public static double[] getBMIScores(List<Coder> coders) {
+		double[] bmiScores = new double[coders.size()];
+		for (int i = 0; i < bmiScores.length; i++) {
+			bmiScores[i] = BMICalculator.calculateBMI(coders.get(i));
+		}
+		return bmiScores;
+	}
+
+	private static double calculateBMI(Coder coder) {
+		double height = coder.getHeight();
+		double weight = coder.getWeight();
+		if (height == 0.0)
+			throw new ArithmeticException();
+		double bmi = weight / (height * height);
+		return Math.round(bmi * 100) / 100.0;
+	}
+
+}

src/main/java/com/javafanatics/Coder.java

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+package com.javafanatics;
+
+public class Coder {
+	
+	private double height;
+	private double weight;
+	private int age;
+	private Gender gender;
+		
+	public Coder(double height, double weight) {
+		super();
+		this.height = height;
+		this.weight = weight;
+	}
+	
+	public Coder(double height, double weight, int age, Gender gender) {
+		super();
+		this.height = height;
+		this.weight = weight;
+		this.age = age;
+		this.gender = gender;
+	}
+	
+	public double getHeight() {
+		return height;
+	}
+	public void setHeight(double height) {
+		this.height = height;
+	}
+	public double getWeight() {
+		return weight;
+	}
+	public void setWeight(double weight) {
+		this.weight = weight;
+	}
+	public int getAge() {
+		return age;
+	}
+	public void setAge(int age) {
+		this.age = age;
+	}
+	public Gender getGender() {
+		return gender;
+	}
+	public void setGender(Gender gender) {
+		this.gender = gender;
+	}	
+}

src/main/java/com/javafanatics/DietPlan.java

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+package com.javafanatics;
+
+public class DietPlan {
+	private int calories;
+	private int protein;
+	private int fat;
+	private int carbohydrate;
+	
+	public DietPlan(int calories, int protein, int fat, int carbohydrate) {
+		super();
+		this.calories = calories;
+		this.protein = protein;
+		this.fat = fat;
+		this.carbohydrate = carbohydrate;
+	}
+	
+	@Override
+	public String toString() {
+		return "Diet [calories=" + calories + ", protein=" + protein + ", fat=" + fat + ", carbohydrate="
+				+ carbohydrate + "]";
+	}
+
+	public int getCalories() {
+		return calories;
+	}
+	public void setCalories(int calories) {
+		this.calories = calories;
+	}
+	public int getProtein() {
+		return protein;
+	}
+	public void setProtein(int protein) {
+		this.protein = protein;
+	}
+	public int getFat() {
+		return fat;
+	}
+	public void setFat(int fat) {
+		this.fat = fat;
+	}
+	public int getCarbohydrate() {
+		return carbohydrate;
+	}
+	public void setCarbohydrate(int carbohydrate) {
+		this.carbohydrate = carbohydrate;
+	}
+}

src/main/java/com/javafanatics/DietPlanner.java

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+package com.javafanatics;
+
+public class DietPlanner {
+
+	private int proteinPercentage;
+	private int fatPercentage;
+	private int carbohydratePercentage;
+	
+	public DietPlanner(int proteinPercentage, int fatPercentage, int carbohydratePercentage) {
+		super();
+		if (proteinPercentage + fatPercentage + carbohydratePercentage != 100) {
+			throw new RuntimeException("protein, fat and carbohydrate percentages must add up to 100!");
+		}
+			
+		this.proteinPercentage = proteinPercentage;
+		this.fatPercentage = fatPercentage;
+		this.carbohydratePercentage = carbohydratePercentage;
+	}
+	
+	public DietPlan calculateDiet(Coder coder) {
+		int calories = this.calculateBMR(coder);
+		int protein = this.calculateProtein(calories);
+		int fat = this.calculateFat(calories);
+		int carbohydrate = this.calculateCarbohydrate(calories);
+		
+		return new DietPlan(calories, protein, fat, carbohydrate);
+	}
+	
+	private int calculateProtein(int bmr) {
+		return (int) Math.round(bmr * proteinPercentage / 400.0);
+	}
+	private int calculateFat(int bmr) {
+		return (int) Math.round(bmr * fatPercentage / 900.0);
+	}
+	private int calculateCarbohydrate(int bmr) {
+		return (int) Math.round(bmr * carbohydratePercentage / 400.0);
+	}
+	
+	private int calculateBMR(Coder coder) {		
+		if (coder.getGender() == Gender.MALE) {
+			return (int) Math.round(
+					(66.5 + 13.8 * coder.getWeight() 
+					+ 5.0 * coder.getHeight() * 100 
+					- 6.8 * coder.getAge()) * 1.2
+			);
+		}
+		
+		return (int) Math.round(
+				(655.1 + 9.6 * coder.getWeight() 
+				+ 1.9 * coder.getHeight() * 100 
+				- 4.7 * coder.getAge()) * 1.2 
+		);
+	}
+}

src/main/java/com/javafanatics/Gender.java

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+package com.javafanatics;
+
+public enum Gender {
+	MALE, FEMALE
+}

src/test/java/com/javafanatics/AppTest.java

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+package com.javafanatics;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest
+{
+  /**
+   * Rigorous Test :-)
+   */
+  @Test
+  public void shouldAnswerWithTrue()
+  {
+    assertTrue( true );
+  }
+}