Java Coding Problems

Reading text files in memory

The Files class comes with two methods that can read an entire text file in memory. One of them is List<String> readAllLines​(Path path, Charset cs):

List<String> lines = Files.readAllLines(  chineseFile, StandardCharsets.UTF_16);

Moreover, we can read the entire content in a String via Files.readString​(Path path, Charset cs):

String content = Files.readString(chineseFile,   StandardCharsets.UTF_16);

While these methods are very convenient for relatively small files, they are not a good choice for large files. Trying to fetch large files in memory is prone to OutOfMemoryError and, obviously, will consume a lot of memory. Alternatively, in the case of huge files (for example, 200 GB), we can focus on memory-mapped ...