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Add list files recursively snippet

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Original file line number	Diff line number	Diff line change
`@@ -16,6 +16,7 @@ Update the sample application with the snippet and add a test for it. After prov`
`16`	`16`	`###File`
`17`	`17`	`*[List directories](#list-directories)`
`18`	`18`	`*[List files in directory](#list-files-in-directory)`
	`19`	`+*[List files in directory recursively](#list-files-in-directory-recursively)`
`19`	`20`	`*[Read lines from file to string list](#read-lines-from-file-to-string-list)`
`20`	`21`
`21`	`22`	`###Math`
`@@ -86,6 +87,27 @@ Update the sample application with the snippet and add a test for it. After prov`
`86`	`87`
`87`	`88`	`[⬆ back to top](#table-of-contents)`
`88`	`89`
	`90`	`+###List files in directory recursively`
	`91`	`+`
	`92`	+```java
	`93`	`+publicstaticList<File> listAllFiles(String path) {`
	`94`	`+List<File> all=newArrayList<>();`
	`95`	`+File[] list=newFile(path).listFiles();`
	`96`	`+if (list!=null) {// In case of access error, list is null`
	`97`	`+for (File f: list) {`
	`98`	`+if (f.isDirectory()) {`
	`99`	`+ all.addAll(listAllFiles(f.getAbsolutePath()));`
	`100`	`+ }else {`
	`101`	`+ all.add(f.getAbsoluteFile());`
	`102`	`+ }`
	`103`	`+ }`
	`104`	`+ }`
	`105`	`+return all;`
	`106`	`+ }`
	`107`	+```
	`108`	`+`
	`109`	`+[⬆ back to top](#table-of-contents)`
	`110`	`+`
`89`	`111`	`###Read lines from file to string list`
`90`	`112`
`91`	`113`	```java

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Original file line number	Diff line number	Diff line change
`@@ -159,4 +159,24 @@ public static boolean isPalindrome(String s) {`
`159`	`159`	`publicstaticFile[]listFilesInDirectory(finalFilefolder) {`
`160`	`160`	`returnfolder.listFiles(File::isFile);`
`161`	`161`	`}`
	`162`	`+`
	`163`	`+/**`
	`164`	`+ * Recursively list all the files in directory`
	`165`	`+ * @param path the path to start the search from`
	`166`	`+ * @return list of all files`
	`167`	`+ */`
	`168`	`+publicstaticList<File>listAllFiles(Stringpath) {`
	`169`	`+List<File>all =newArrayList<>();`
	`170`	`+File[]list =newFile(path).listFiles();`
	`171`	`+if (list !=null) {// In case of access error, list is null`
	`172`	`+for (Filef :list) {`
	`173`	`+if (f.isDirectory()) {`
	`174`	`+all.addAll(listAllFiles(f.getAbsolutePath()));`
	`175`	`+ }else {`
	`176`	`+all.add(f.getAbsoluteFile());`
	`177`	`+ }`
	`178`	`+ }`
	`179`	`+ }`
	`180`	`+returnall;`
	`181`	`+ }`
`162`	`182`	`}`

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`@@ -172,4 +172,13 @@ public void testListFilesInDirectory() {`
`172`	`172`	`assertEquals(1,files.length);`
`173`	`173`	`assertEquals("src/test/resources/somelines.txt",files[0].toString());`
`174`	`174`	`}`
	`175`	`+`
	`176`	`+/**`
	`177`	`+ * Tests for {@link Library#listAllFiles(String)}`
	`178`	`+ */`
	`179`	`+@Test`
	`180`	`+publicvoidtestListAllFiles() {`
	`181`	`+List<File>files =Library.listAllFiles("src/test/resources");`
	`182`	`+assertEquals(3,files.size());`
	`183`	`+ }`
`175`	`184`	`}`

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