Add Unique Number Detector

UniqueNumber.java

@@ -0,0 +1,62 @@
+import java.util.Scanner;
+
+/*
+ * This program will take in a number and check if it is unique.
+ * A unique number is a number that has no repeating digits.
+ * For example, 1234 is a unique number, but 1224 is not.
+ */
+public class UniqueNumber {
+    public static void main(String[] args) {
+        // Create a Scanner object to read input
+        Scanner input = new Scanner(System.in);
+
+        // Prompt the user to enter a number
+        System.out.print("Enter a number: ");
+
+        // Read the number
+        int number = input.nextInt();
+
+        // Check if the number is unique
+        if (isUnique(number)) {
+            System.out.println(number + " is a unique number.");
+        } else {
+            System.out.println(number + " is not a unique number.");
+        }
+    }
+
+    /**
+     * This method will take in a number and check if it is unique.
+     *
+     * @param number The number to check if it is unique
+     * @return true if the number is unique, false otherwise
+     */
+    public static boolean isUnique(int number) {
+        // Create an array to store the number of times each digit appears
+        // Digits can be from 0 to 9, so the array will have 10 elements
+        // The digits will represent indexes of the array
+        int[] array = new int[10];
+
+        // Loop through each digit of the number
+        while (number > 0) {
+            // Get the last digit of the number
+            int digit = number % 10;
+
+            // Increment the number of times the digit appears
+            array[digit]++;
+
+            // Remove the last digit from the number
+            number /= 10;
+        }
+
+        // Loop through the array
+        for (int j : array) {
+            // If a digit appears more than once, the number is not unique
+            if (j > 1) {
+                return false;
+            }
+        }
+
+        // If the loop finishes, the number is unique
+        return true;
+    }
+}