Add reverse string snippet

iluwatar · iluwatar · commit 841ca9444e38 · 2017-12-17T14:04:14.000+02:00
diff --git a/README.md b/README.md
@@ -17,6 +17,9 @@ Update the sample application with the snippet and add a test for it. After prov
 * [Factorial](#factorial)
 * [Fibonacci](#fibonacci)
 
+### String
+* [Reverse string](#reverse-string)
+
 ## Array
 
 ### Generic two array concatenation
@@ -77,3 +80,15 @@ Update the sample application with the snippet and add a test for it. After prov
 ```
 
 [⬆ back to top](#table-of-contents)
+
+## String
+
+### Reverse string
+
+```java
+    public static String reverseString(String s) {
+        return new StringBuilder(s).reverse().toString();
+    }
+```
+
+[⬆ back to top](#table-of-contents)
diff --git a/src/main/java/Library.java b/src/main/java/Library.java
@@ -65,4 +65,13 @@ public static int factorial(int number) {
         }
         return result;
     }
+
+    /**
+     * Reverse string
+     * @param s the string to reverse
+     * @return reversed string
+     */
+    public static String reverseString(String s) {
+        return new StringBuilder(s).reverse().toString();
+    }
 }
diff --git a/src/test/java/LibraryTest.java b/src/test/java/LibraryTest.java
@@ -74,4 +74,9 @@ public void testFactorial() {
         assertEquals(362880, Library.factorial(9));
         assertEquals(3628800, Library.factorial(10));
     }
+    @Test
+    public void testReverseString() {
+        assertEquals("oof", Library.reverseString("foo"));
+        assertEquals("ÖÄÅ321FED cba", Library.reverseString("abc DEF123ÅÄÖ"));
+    }
 }

Original file line number	Diff line number	Diff line change
`@@ -65,4 +65,13 @@ public static int factorial(int number) {`
`65`	`65`	`}`
`66`	`66`	`return result;`
`67`	`67`	`}`
	`68`	`+`
	`69`	`+ /**`
	`70`	`+ * Reverse string`
	`71`	`+ * @param s the string to reverse`
	`72`	`+ * @return reversed string`
	`73`	`+ */`
	`74`	`+ public static String reverseString(String s) {`
	`75`	`+ return new StringBuilder(s).reverse().toString();`
	`76`	`+ }`
`68`	`77`	`}`
Original file line number	Diff line number	Diff line change
`@@ -74,4 +74,9 @@ public void testFactorial() {`
`74`	`74`	`assertEquals(362880, Library.factorial(9));`
`75`	`75`	`assertEquals(3628800, Library.factorial(10));`
`76`	`76`	`}`
	`77`	`+ @Test`
	`78`	`+ public void testReverseString() {`
	`79`	`+ assertEquals("oof", Library.reverseString("foo"));`
	`80`	`+ assertEquals("ÖÄÅ321FED cba", Library.reverseString("abc DEF123ÅÄÖ"));`
	`81`	`+ }`
`77`	`82`	`}`