Added Odd-even Sort implementation and test for it

Toppmote · Toppmote · commit 1c6b7dc3821b · 2022-01-22T21:01:43.000+07:00
diff --git a/src/main/java/ru/algorithms/OddEvenSort.java b/src/main/java/ru/algorithms/OddEvenSort.java
@@ -0,0 +1,41 @@
+package ru.algorithms;
+
+import ru.utils.SortingUtils;
+
+/**
+ * Implementation of "Odd-even sort" algorithm.
+ * Worst time: 0(n^2)
+ * Average time: 0(n^2)
+ * Best time: 0(n)
+ * <p>
+ * Memory cost: 0(1)
+ *
+ * @param <T> Data type of array elements
+ */
+public class OddEvenSort<T extends Comparable<? super T>> implements Sorter<T> {
+
+    /**
+     * In the odd phase, we perform a bubble sort on odd indexed elements and in the even phase,
+     * we perform a bubble sort on even indexed elements.
+     *
+     * @param array array for sorting
+     */
+    @Override
+    public void sort(T[] array) {
+        boolean isSorted;
+        do {
+            isSorted = true;
+            for (int i = 1; i < array.length - 2; i += 2)
+                if (array[i].compareTo(array[i + 1]) > 0) {
+                    SortingUtils.swap(array, i, i + 1);
+                    isSorted = false;
+                }
+            for (int i = 0; i < array.length - 2; i += 2)
+                if (array[i].compareTo(array[i + 1]) > 0) {
+                    SortingUtils.swap(array, i, i + 1);
+                    isSorted = false;
+                }
+        } while (!isSorted);
+    }
+
+}
diff --git a/src/test/java/ru/TestAlgorithms.java b/src/test/java/ru/TestAlgorithms.java
@@ -111,4 +111,10 @@ void testInsertionSort() {
         sortTest(new InsertionSort<>());
     }
 
+    @Test
+    @DisplayName("Odd-even Sort test")
+    void testOddEvenSort() {
+        sortTest(new OddEvenSort<>());
+    }
+
 }

Original file line number	Diff line number	Diff line change
`@@ -111,4 +111,10 @@ void testInsertionSort() {`
`111`	`111`	`sortTest(new InsertionSort<>());`
`112`	`112`	`}`
`113`	`113`
	`114`	`+ @Test`
	`115`	`+ @DisplayName("Odd-even Sort test")`
	`116`	`+ void testOddEvenSort() {`
	`117`	`+ sortTest(new OddEvenSort<>());`
	`118`	`+ }`
	`119`	`+`
`114`	`120`	`}`