Jul 17, 2025
diff --git a/src/main/java/com/thealgorithms/maths/Median.java b/src/main/java/com/thealgorithms/maths/Median.java
     * Calculate average median
     * @param values sorted numbers to find median of
     * @return median of given {@code values}
     * @throws IllegalArgumentException If the input array is empty or null.
     */
    public static double median(int[] values) {
        if (values == null || values.length == 0) {
            throw new IllegalArgumentException("Values array cannot be empty or null");
        }

        Arrays.sort(values);
        int length = values.length;
        return length % 2 == 0 ? (values[length / 2] + values[length / 2 - 1]) / 2.0 : values[length / 2];
diff --git a/src/test/java/com/thealgorithms/maths/MedianTest.java b/src/test/java/com/thealgorithms/maths/MedianTest.java
 package com.thealgorithms.maths;

 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;

 import org.junit.jupiter.api.Test;

        int[] arr = {-27, -16, -7, -4, -2, -1};
        assertEquals(-5.5, Median.median(arr));
    }

    @Test
    void medianEmptyArrayThrows() {
        int[] arr = {};
        assertThrows(IllegalArgumentException.class, () -> Median.median(arr));
    }
 }
Original file line number	Diff line number	Diff line change
Expand Up		@@ -13,8 +13,13 @@ private Median() {
		* Calculate average median
		* @param values sorted numbers to find median of
		* @return median of given {@code values}
		* @throws IllegalArgumentException If the input array is empty or null.
		*/
		public static double median(int[] values) {
		if (values == null \|\| values.length == 0) {
		throw new IllegalArgumentException("Values array cannot be empty or null");
		}

		Arrays.sort(values);
		int length = values.length;
		return length % 2 == 0 ? (values[length / 2] + values[length / 2 - 1]) / 2.0 : values[length / 2];
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -1,6 +1,7 @@
		package com.thealgorithms.maths;

		import static org.junit.jupiter.api.Assertions.assertEquals;
		import static org.junit.jupiter.api.Assertions.assertThrows;

		import org.junit.jupiter.api.Test;

Expand DownExpand Up		@@ -34,4 +35,10 @@ void medianNegativeValues() {
		int[] arr = {-27, -16, -7, -4, -2, -1};
		assertEquals(-5.5, Median.median(arr));
		}

		@Test
		void medianEmptyArrayThrows() {
		int[] arr = {};
		assertThrows(IllegalArgumentException.class, () -> Median.median(arr));
		}
		}