How to Efficiently Read a Specific Line from a File in Java?

Reading a Specific Line from a File in Java

In Java, accessing specific lines from a file is a common requirement. Whether you need to read line 32 or any other particular line, here's how you can achieve it effectively.

Reading a Specific Line for Small Files

For relatively small files, a straightforward approach can be used. The readAllLines method of the Files class can be employed to obtain a List of all the lines in the file. From this list, you can simply retrieve the required line using its index.

String line32 = Files.readAllLines(Paths.get("file.txt")).get(32);

Reading a Specific Line for Large Files

For large files, it's advisable to adopt a more efficient approach that avoids reading the entire file into memory. The Files.lines method provides a stream that allows for incremental processing of the file.

try (Stream<String> lines = Files.lines(Paths.get("file.txt"))) {
    String line32 = lines.skip(31).findFirst().get();
}

In this approach, the skip method is used to advance the stream to the desired line number, and findFirst is employed to obtain the next line.

The above is the detailed content of How to Efficiently Read a Specific Line from a File in Java?. For more information, please follow other related articles on the PHP Chinese website!