reverse String in Java using Iteration & Recusrion

reverse String in Java using Iteration and Recursion? (solution)
Your task is to write a program to reverse String in Java without using StringBuffer class. You also need to provide both iterative and recursive algorithm for String reversal. You can use other String utility methods e.g. charAt(), toCharArray() or substring() from java.lang.String class.

Author: singhvirendra18gmailcom

Challenge04.java

@@ -0,0 +1,39 @@
+package challenge04;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * The Class Challenge04.
+ * 
+ * Reverse String in Java using Iteration and Recursion?
+ */
+public class Challenge04 {
+
+	public static String reverseUsingIteration(String input) {
+		int len = input.length();
+		char[] c = new char[len];
+		len--;
+		for (int i = 0; i <= len; i++) {
+			c[i] = input.charAt(len - i);
+		}
+		return new String(c);
+
+	}
+
+	public static String reverse(String input){
+		
+		if(input.length()<2){
+				return input;
+		}
+		
+		return reverse(input.substring(1)) + input.charAt(0);
+}
+	@Test
+	public void test() {	
+		assertTrue(Challenge04.reverse("Hello").equals("olleH"));
+		assertTrue(Challenge04.reverseUsingIteration("Hi Hello How are you").equals("uoy era woH olleH iH"));
+		
+	}
+}