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

src/main/java/com/thealgorithms/strings/CheckVowels.java

@@ -0,0 +1,53 @@
+package com.thealgorithms.strings;
+
+/**
+ * Vowel Count is a system whereby character strings are placed in order based
+ * on the position of the characters in the conventional ordering of an
+ * alphabet. Wikipedia: https://en.wikipedia.org/wiki/Alphabetical_order
+ */
+class CheckVowels {
+
+    public static void main(String[] args) {
+        assert !hasVowels("This is a strings");
+        assert hasVowels("Hello World");
+        assert hasVowels("Java is fun");
+        assert !hasVowels("123hi");
+        assert hasVowels("Coding vs Programming");
+    }
+
+    /**
+     * Check if a string is has vowels or not
+     *
+     * @param input a string
+     * @return {@code true} if given string has vowels, otherwise {@code false}
+     */
+    public static boolean hasVowels(String input) {
+        if (input.matches("[AEIOUaeiou]")) {
+            countVowels(input);
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * count the number of vowels
+     *
+     * @param input a string prints the count of vowels
+     */
+    public static void countVowels(String input) {
+        input = input.toLowerCase();
+        int count = 0;
+        int i = 0;
+        while (i < input.length()) {
+            if (input.charAt(i) == 'a'
+                    || input.charAt(i) == 'e'
+                    || input.charAt(i) == 'i'
+                    || input.charAt(i) == 'o'
+                    || input.charAt(i) == 'u') {
+                count++;
+            }
+            i++;
+        }
+        System.out.println(count);
+    }
+}