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();
}</string>

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.

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