Change project structure to a Maven Java project + Refactor (#2816)

src/main/java/com/thealgorithms/maths/AbsoluteValue.java

@@ -0,0 +1,26 @@
+package com.thealgorithms.maths;
+
+import java.util.Random;
+
+public class AbsoluteValue {
+
+    public static void main(String[] args) {
+        Random random = new Random();
+
+        /* test 1000 random numbers */
+        for (int i = 1; i <= 1000; ++i) {
+            int randomNumber = random.nextInt();
+            assert absVal(randomNumber) == Math.abs(randomNumber);
+        }
+    }
+
+    /**
+     * If value is less than zero, make value positive.
+     *
+     * @param value a number
+     * @return the absolute value of a number
+     */
+    public static int absVal(int value) {
+        return value < 0 ? -value : value;
+    }
+}