documentation added

Author: mjk22071998

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

@@ -1,12 +1,23 @@
 package com.thealgorithms.maths;
 
+/**
+ * A positive integer is considered uniform if all
+ * of its digits are equal. For example, 222 is uniform,
+ * while 223 is not.
+ * Given two positive integers a and b, determine the
+ * number of uniform integers between a and b.
+ */
 public final class UniformNumbers {
-
     // Private constructor to prevent instantiation of the utility class
     private UniformNumbers() {
         // Prevent instantiation
     }
-
+    /**
+     * This function will find the number of uniform numbers
+     * from 1 to num
+     * @param num upper limit to find the uniform numbers
+     * @return the count of uniform numbers between 1 and num
+     */
     public static int uniformNumbers(int num) {
         String numStr = Integer.toString(num);
         int uniformCount = (numStr.length() - 1) * 9;
@@ -20,7 +31,13 @@ public static int uniformNumbers(int num) {
 
         return uniformCount;
     }
-
+    /**
+     * This function will calculate the number of uniform numbers
+     * between a and b
+     * @param a lower bound of range
+     * @param b upper bound of range
+     * @return  the count of uniform numbers between a and b
+     */
     public static int countUniformIntegers(int a, int b) {
         if (b > a && b > 0 && a > 0) {
             return uniformNumbers(b) - uniformNumbers(a - 1);