In Java 8, there are several new methods added to the java.nio.file.Files class that make it easier to read and write files using the new stream API. Here are some examples:
Read file contents to a string:
String contents = new String(Files.readAllBytes(Paths.get("filename.txt")));
Read file contents to a list of strings (one line per element):
List<String> lines = Files.lines(Paths.get("filename.txt")).collect(Collectors.toList());
Write a string to a file:
String content = "Hello, World!";
Files.write(Paths.get("filename.txt"), content.getBytes());
Write a list of strings to a file (one element per line):
List<String> lines = Arrays.asList("line 1", "line 2", "line 3");
Files.write(Paths.get("filename.txt"), lines);
Append a string to an existing file:
String content = "Hello, World!";
Files.write(Paths.get("filename.txt"), content.getBytes(), StandardOpenOption.APPEND);
Delete a file:
Files.delete(Paths.get("filename.txt"));
Note that these methods throw IOException in case of any I/O error. Also, it’s important to close the stream after using it to avoid any resource leaks.
