Private constructors for static-only classes

src/main/java/io/github/diegourban/algorithms/datastructure/array/ArrayUtils.java

@@ -4,6 +4,9 @@
 
 public class ArrayUtils {
 
+    private ArrayUtils() {
+    }
+
     private static Random rand = new Random();
 
     /**

src/main/java/io/github/diegourban/algorithms/math/Combinatorics.java

@@ -4,6 +4,9 @@
 
 public class Combinatorics {
 
+    private Combinatorics() {
+    }
+
     /**
      * Pascal's Triangle
      * <p>

src/main/java/io/github/diegourban/algorithms/math/Geometry.java

@@ -4,6 +4,9 @@
 
 public class Geometry {
 
+    private Geometry() {
+    }
+
     private static final double SIMPLE_PI = 3.14;
 
     /**

src/main/java/io/github/diegourban/algorithms/math/Measurement.java

@@ -2,6 +2,9 @@
 
 public class Measurement {
 
+    private Measurement() {
+    }
+
     /**
      * Converts miles to kilometers
      *

src/main/java/io/github/diegourban/algorithms/math/NumberTheory.java

@@ -7,6 +7,9 @@
  */
 public class NumberTheory {
 
+    private NumberTheory() {
+    }
+
     /**
      * Least common multiple (lcm) of two numbers.
      *

src/main/java/io/github/diegourban/algorithms/math/Numbers.java

@@ -2,6 +2,9 @@
 
 public class Numbers {
 
+    private Numbers() {
+    }
+
     /**
      * Checks if a number contains a digit
      *

src/main/java/io/github/diegourban/algorithms/math/Statistics.java

@@ -4,6 +4,9 @@
 
 public class Statistics {
 
+    private Statistics() {
+    }
+
     /**
      * An average is the sum of a list of numbers divided by the number of
      * numbers in the list.

src/main/java/io/github/diegourban/algorithms/search/BinarySearch.java

@@ -5,6 +5,9 @@
  */
 public class BinarySearch {
 
+    private BinarySearch() {
+    }
+
     /**
      * Finds an element in an ordered list
      *

src/main/java/io/github/diegourban/algorithms/string/StringUtils.java

@@ -4,6 +4,9 @@
 
 public class StringUtils {
 
+    private StringUtils() {
+    }
+
     public static boolean isPalindrome(String theString) {
         if (theString == null || theString.isEmpty()) {
             return false;

src/test/java/io/github/diegourban/algorithms/datastructure/array/ArrayUtilsTest.java

@@ -8,11 +8,6 @@
 
 class ArrayUtilsTest {
 
-    @Test
-    void shouldCreateInstance() {
-        assertThat(new ArrayUtils()).isNotNull();
-    }
-
     @Test
     void shouldNotShuffleSmallArray() {
         int[] array = new int[]{1};

src/test/java/io/github/diegourban/algorithms/math/CombinatoricsTest.java

@@ -9,11 +9,6 @@
 
 class CombinatoricsTest {
 
-    @Test
-    void shouldCreateInstance() {
-        assertThat(new Combinatorics()).isNotNull();
-    }
-
     @Test
     void shouldCalculateBinomialCoefficient() {
         // invalid inputs

src/test/java/io/github/diegourban/algorithms/math/GeometryTest.java

@@ -7,11 +7,6 @@
 
 class GeometryTest {
 
-    @Test
-    void shouldCreateInstance() {
-        assertThat(new Geometry()).isNotNull();
-    }
-
     @Test
     void shouldCalculateDistance() {
         assertThat(Geometry.distance(-2, 1, 1, 5)).isCloseTo(5.0, within(0.1));

src/test/java/io/github/diegourban/algorithms/math/MeasurementTest.java

@@ -7,11 +7,6 @@
 
 class MeasurementTest {
 
-    @Test
-    void shouldCreateInstance() {
-        assertThat(new Measurement()).isNotNull();
-    }
-
     @Test
     void shouldConvertMilesToKilometers() {
         assertThat(Measurement.milesToKilometers(1)).isCloseTo(1.609344, within(0.1));

src/test/java/io/github/diegourban/algorithms/math/NumberTheoryTest.java

@@ -10,11 +10,6 @@
 
 class NumberTheoryTest {
 
-    @Test
-    void shouldCreateInstance() {
-        assertThat(new NumberTheory()).isNotNull();
-    }
-
     @Test
     void shouldFindLeastCommonMultiplesOfTwoNumbers() {
         assertThat(NumberTheory.lcm(1, 2)).isEqualTo(2);

src/test/java/io/github/diegourban/algorithms/math/NumbersTest.java

@@ -7,11 +7,6 @@
 
 class NumbersTest {
 
-    @Test
-    void shouldCreateInstance() {
-        assertThat(new Numbers()).isNotNull();
-    }
-
     @Test
     void shouldHandleContainsDigit() {
         assertThat(Numbers.containsDigit(124, 4)).isTrue();

src/test/java/io/github/diegourban/algorithms/math/StatisticsTest.java

@@ -8,11 +8,6 @@
 
 class StatisticsTest {
 
-    @Test
-    void shouldCreateInstance() {
-        assertThat(new Statistics()).isNotNull();
-    }
-
     @Test
     void shouldCalculateMean() {
         assertThat(Statistics.mean(new double[]{})).isCloseTo(0.0, within(0.1));

src/test/java/io/github/diegourban/algorithms/string/StringUtilsTest.java

@@ -8,11 +8,6 @@
 
 class StringUtilsTest {
 
-    @Test
-    void shouldCreateInstance() {
-        assertThat(new StringUtils()).isNotNull();
-    }
-
     @Test
     void shouldConsiderPalindrome() {
         assertThat(StringUtils.isPalindrome("a")).isTrue();