BAEL-1525: More changes.

core-java/src/main/java/com/baeldung/string/Palindrome.java

@@ -8,7 +8,33 @@ public class Palindrome {
         int forward = 0;
         int backward = length - 1;
         boolean palindrome = true;
-        while ((backward > forward)?(palindrome=(text.charAt(forward++) == text.charAt(backward--))):false);
+        while (backward > forward) {
+            char forwardChar = text.charAt(forward++);
+            char backwardChar = text.charAt(backward--);
+            if (forwardChar != backwardChar)
+                return false;
+        }
         return palindrome;
     }
+
+    public boolean isPalindromeReverseTheString(String text) {
+        String reverse = "";
+        text = text.toLowerCase();
+        char[] plain = text.toCharArray();
+        for (int i = plain.length - 1; i >= 0; i--)
+            reverse += plain[i];
+        return reverse.equals(text);
+    }
+
+    public boolean isPalindromeUsingStringBuilder(String text) {
+        StringBuilder plain = new StringBuilder(text);
+        StringBuilder reverse = plain.reverse();
+        return reverse.equals(plain);
+    }
+
+    public boolean isPalindromeUsingStringBuffer(String text) {
+        StringBuffer plain = new StringBuffer(text);
+        StringBuffer reverse = plain.reverse();
+        return reverse.equals(plain);
+    }
 }

core-java/src/test/java/com/baeldung/string/WhenCheckingPalindrome.java

@@ -34,4 +34,40 @@ public class WhenCheckingPalindrome {
         for(String sentence:sentences)
             Assert.assertTrue(palindrome.isPalindrome(sentence));
     }
+    
+    @Test
+    public void whenReverseWord_shouldBePalindrome() {
+        for(String word:words)
+            Assert.assertTrue(palindrome.isPalindromeReverseTheString(word));
+    }
+    
+    @Test
+    public void whenReverseSentence_shouldBePalindrome() {
+        for(String sentence:sentences)
+            Assert.assertTrue(palindrome.isPalindromeReverseTheString(sentence));
+    }
+    
+    @Test
+    public void whenStringBuilderWord_shouldBePalindrome() {
+        for(String word:words)
+            Assert.assertTrue(palindrome.isPalindromeUsingStringBuilder(word));
+    }
+    
+    @Test
+    public void whenStringBuilderSentence_shouldBePalindrome() {
+        for(String sentence:sentences)
+            Assert.assertTrue(palindrome.isPalindromeUsingStringBuilder(sentence));
+    }
+    
+    @Test
+    public void whenStringBufferWord_shouldBePalindrome() {
+        for(String word:words)
+            Assert.assertTrue(palindrome.isPalindromeUsingStringBuffer(word));
+    }
+    
+    @Test
+    public void whenStringBufferSentence_shouldBePalindrome() {
+        for(String sentence:sentences)
+            Assert.assertTrue(palindrome.isPalindromeUsingStringBuffer(sentence));
+    }
 }