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Add palindrome check snippet

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Lines changed: 19 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -25,6 +25,7 @@ Update the sample application with the snippet and add a test for it. After prov`
`25`	`25`	`*[Capture screen](#capture-screen)`
`26`	`26`
`27`	`27`	`###String`
	`28`	`+*[Palindrome check](#palindrome-check)`
`28`	`29`	`*[Reverse string](#reverse-string)`
`29`	`30`	`*[String to date](#string-to-date)`
`30`	`31`
`@@ -129,6 +130,24 @@ Update the sample application with the snippet and add a test for it. After prov`
`129`	`130`
`130`	`131`	`##String`
`131`	`132`
	`133`	`+###Palindrome check`
	`134`	`+`
	`135`	+```java
	`136`	`+publicstaticboolean isPalindrome(String s) {`
	`137`	`+StringBuilder sb=newStringBuilder();`
	`138`	`+for (char c: s.toCharArray()) {`
	`139`	`+if (Character.isLetter(c)) {`
	`140`	`+ sb.append(c);`
	`141`	`+ }`
	`142`	`+ }`
	`143`	`+String forward= sb.toString().toLowerCase();`
	`144`	`+String backward= sb.reverse().toString().toLowerCase();`
	`145`	`+return forward.equals(backward);`
	`146`	`+ }`
	`147`	+```
	`148`	`+`
	`149`	`+[⬆ back to top](#table-of-contents)`
	`150`	`+`
`132`	`151`	`###Reverse string`
`133`	`152`
`134`	`153`	```java

Lines changed: 19 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -130,4 +130,23 @@ public static Date stringToDate(String date, String format) throws ParseExceptio`
`130`	`130`	`publicstaticFile[]listDirectories(Stringpath) {`
`131`	`131`	`returnnewFile(path).listFiles(File::isDirectory);`
`132`	`132`	`}`
	`133`	`+`
	`134`	`+/**`
	`135`	`+ * Checks if given string is palindrome (same forward and backward)`
	`136`	`+ * Skips non-letter characters`
	`137`	`+ * Credits: https://github.com/kousen/java_8_recipes`
	`138`	`+ * @param s string to check`
	`139`	`+ * @return true if palindrome`
	`140`	`+ */`
	`141`	`+publicstaticbooleanisPalindrome(Strings) {`
	`142`	`+StringBuildersb =newStringBuilder();`
	`143`	`+for (charc :s.toCharArray()) {`
	`144`	`+if (Character.isLetter(c)) {`
	`145`	`+sb.append(c);`
	`146`	`+ }`
	`147`	`+ }`
	`148`	`+Stringforward =sb.toString().toLowerCase();`
	`149`	`+Stringbackward =sb.reverse().toString().toLowerCase();`
	`150`	`+returnforward.equals(backward);`
	`151`	`+ }`
`133`	`152`	`}`

Lines changed: 11 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -151,4 +151,15 @@ public void testListDirectories() {`
`151`	`151`	`assertTrue(Arrays.stream(files).anyMatch(newFile("src/test/resources/dir1")::equals));`
`152`	`152`	`assertTrue(Arrays.stream(files).anyMatch(newFile("src/test/resources/dir2")::equals));`
`153`	`153`	`}`
	`154`	`+`
	`155`	`+/**`
	`156`	`+ * Tests for {@link Library#isPalindrome(String)}`
	`157`	`+ */`
	`158`	`+@Test`
	`159`	`+publicvoidtestIsPalindrome() {`
	`160`	`+assertTrue(Library.isPalindrome("saippuakauppias"));`
	`161`	`+assertTrue(Library.isPalindrome("111 Saippua - Kauppias 321"));`
	`162`	`+assertFalse(Library.isPalindrome("Type O Negative"));`
	`163`	`+assertFalse(Library.isPalindrome("Foo12121Bar"));`
	`164`	`+ }`
`154`	`165`	`}`

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