How to Efficiently Read Specific Lines from Files in Java?

Reading Specific Lines from Files in Java

Reading specific lines from a file is a common task in many programming scenarios. In Java, there are two primary approaches to achieve this, depending on the size of the file:

Small Files:

If the file is relatively small, reading the entire file into memory and accessing the desired line is efficient. This can be done using the readAllLines() method, which returns a list of all lines in the file. To retrieve a specific line, simply use the line number as an index:

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

Large Files:

For large files, it's more efficient to avoid loading the entire file into memory. Instead, use the lines() method to obtain a stream of lines. Skip to the desired line number using skip() and retrieve it:

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

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