Count number of vowels and consonants in a String

 How to count number of vowels and consonants in a String? (solution)
One of easiest String question you will ever see. You have to write a Java program which will take a String input and print out number of vowels and consonants on that String. For example the if input is "Java" then your program should print "2 vowels and 2 consonants". If you get this question on Interview, you should clarify that whether String can contain numbers, special characters or not e.g. anything other than vowels and consonants.

Author: singhvirendra18gmailcom

Challenge07.java

@@ -0,0 +1,35 @@
+package challenge07;
+
+import static org.junit.Assert.assertTrue;
+import java.util.regex.Pattern;
+import org.junit.Test;
+
+/**
+ * The Class Challenge06.
+ * 
+ * count number of vowels and consonants in a String.
+ */
+public class Challenge07 {
+
+	public static String vowelAndConstantCount(String input) {
+		int vowels = 0;
+		int constants = 0;
+
+		for (int i = 0; i < input.length() - 1; i++) {
+			if (Pattern.matches("[a-zA-Z]{1}", input.substring(i, i + 1))) {
+				if (Pattern.matches("[a,e,i,o,u]{1}", input.substring(i, i + 1))) {
+					vowels++;
+				} else {
+					constants++;
+				}
+
+			}
+		}
+		return vowels + ";" + constants;
+	}
+
+	@Test
+	public void test() {
+		assertTrue("3;7".equals(Challenge07.vowelAndConstantCount("{Programming")));
+	}
+}