Lab Completed

pom.xml

@@ -7,6 +7,18 @@
     <groupId>com.zipcodewilmington</groupId>
     <artifactId>Dicey-Lab</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.1</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
 
 
 </project>

src/main/java/Bins.java

@@ -1,4 +1,26 @@
+import java.util.HashMap;
+import java.util.Map;
 
 public class Bins {
+    private Integer lower;
+    private Integer upper;
 
+    private Map<Integer, Integer> binsMap = new HashMap<>();
+
+    public Bins(Integer lower, Integer upper) {
+        this.lower = lower;
+        this.upper = upper;
+
+        for (int i = lower; i <= upper; i++) {
+            binsMap.put(i, 0);
+        }
+    }
+
+    public Integer getBin(int bin) {
+        return binsMap.get(bin);
+    }
+
+    public void incrementBin(int bin) {
+        binsMap.put(bin, getBin(bin)+1);
+    }
 }

src/main/java/Dice.java

@@ -1,4 +1,23 @@
+import java.util.Random;
+
 public class Dice {
+    private Integer numberOfDie;
+
+    public Dice(int numberOfDie) {
+        this.numberOfDie = numberOfDie;
+    }
+
+    public Integer tossAndSum() {
+        Random random = new Random();
+        Integer sum = 0;
 
+        for (int i = 0; i < numberOfDie; i++) {
+            sum += random.nextInt(6) + 1;
+        }
+        return sum;
+    }
 
+    public Integer getNumOfDie() {
+        return this.numberOfDie;
+    }
 }

src/main/java/MainApplication.java

@@ -0,0 +1,8 @@
+public class MainApplication {
+    public static void main(String[] args) {
+        Simulation sim = new Simulation(2, 1000000);
+
+        sim.runSimulation();
+        sim.printResults();
+    }
+}

src/main/java/Simulation.java

@@ -1,5 +1,61 @@
 public class Simulation {
+    private Integer numberOfDie;
+    private Integer numberOfTosses;
+    private Bins bins;
 
+    public Simulation(Integer numberOfDie, Integer numberOfTosses) {
+        this.numberOfDie = numberOfDie;
+        this.numberOfTosses = numberOfTosses;
+    }
+
+    public Integer getNumOfDie() {
+        return this.numberOfDie;
+    }
+
+    public Integer getNumOfTosses() {
+        return this.numberOfTosses;
+    }
+
+    public Bins runSimulation() {
+        Dice dice = new Dice(numberOfDie);
+        bins = new Bins(numberOfDie, numberOfDie*6);
+        Integer result;
+
+        for (int i = 0; i < numberOfTosses; i++) {
+            result = dice.tossAndSum();
+            bins.incrementBin(result);
+        }
+        return bins;
+    }
+
+    public void printResults() {
+
+        System.out.println(new StringBuilder()
+                .append("\n***")
+                .append("\nSimulation of " + numberOfDie + " dice tossed " + numberOfTosses + " times.")
+                .append("\n***")
+        + printBins(bins));
+
+    }
+
+
+    private String printBins(Bins bins) {
+        String binLine = "";
+        Double binPercent;
+        Integer stars = 0;
+
+        for(int i = numberOfDie; i <= (numberOfDie*6); i++) {
+            binPercent = ((double) bins.getBin(i)) / numberOfTosses;
+            binLine += String.format("\n%2d : %8d : %.2f ", i, bins.getBin(i), binPercent);
+
+            stars = (100 * bins.getBin(i)) / numberOfTosses;
+
+            for (int j = 0; j < stars; j++) {
+                binLine += "*";
+            }
+        }
+        return binLine;
+    }
 
 
 }

src/test/java/BinsTest.java

@@ -0,0 +1,34 @@
+import org.junit.Assert;
+import org.junit.Test;
+
+public class BinsTest {
+
+    @Test
+    public void incrementBinTest() {
+        //Given
+        Bins bins = new Bins(2, 12);
+        Integer expected = 1;
+
+        //When
+        bins.incrementBin(10);
+        Integer actual = bins.getBin(10);
+
+        //Then
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void binsConstructorTest() {
+        //Given
+        Integer lower = 2;
+        Integer upper = 12;
+        Integer expected = 0;
+
+        //When
+        Bins bins = new Bins(lower, upper);
+        Integer actual = bins.getBin(2);
+
+        //Then
+        Assert.assertEquals(expected, actual);
+    }
+}

src/test/java/DiceTest.java

@@ -0,0 +1,42 @@
+import org.junit.Assert;
+import org.junit.Test;
+
+public class DiceTest{
+
+    @Test
+    public void diceConstructorTest() {
+        //Given
+        Integer expectedNumOfDie = 8;
+
+        //When
+        Dice dice = new Dice(expectedNumOfDie);
+        Integer actual = dice.getNumOfDie();
+
+        //Then
+        Assert.assertEquals(expectedNumOfDie, actual);
+    }
+
+    @Test
+    public void tossAndSumTwoDiceTest() {
+        //Given
+        Dice dice = new Dice(2);
+
+        //When
+        Integer toss = dice.tossAndSum();
+
+        //Then
+        Assert.assertTrue((toss > 1) && (toss < 13));
+    }
+
+    @Test
+    public void tossAndSumFiveDiceTest() {
+        //Given
+        Dice dice = new Dice(5);
+
+        //When
+        Integer toss = dice.tossAndSum();
+
+        //Then
+        Assert.assertTrue((toss > 4) && (toss < 31));
+    }
+}

src/test/java/SimulationTest.java

@@ -0,0 +1,22 @@
+import org.junit.Assert;
+import org.junit.Test;
+
+public class SimulationTest {
+
+    @Test
+    public void simulationConstructorTest() {
+        //Given
+        Integer numberOfDie = 2;
+        Integer numberOfTosses = 10000;
+
+        //When
+        Simulation sim = new Simulation(numberOfDie, numberOfTosses);
+        Integer actualNumOfDie = sim.getNumOfDie();
+        Integer actualNumOfTosses = sim.getNumOfTosses();
+
+        //Then
+        Assert.assertEquals(numberOfDie, actualNumOfDie);
+        Assert.assertEquals(numberOfTosses, actualNumOfTosses);
+    }
+
+}