Java 8 Files Example

Welcome to the Java 8 files tutorial!

First let’s define our testing variable for this tutorial:

Read file line by line

Let’s say we want to read a whole file line after line and print each line to the output console.

Java 7

In Java 7, we would have to iterate like this:

try (final BufferedReader br = new BufferedReader(new FileReader(fileName))) {
    String line;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }
}

This boiler plate code is very cumbersome. Let’s see what Java 8 has to offer.

Java 8

In Java 8, we can simply write this:

Files.readAllLines(Paths.get(fileName)).forEach(System.out::println);

That’s all folks! ;)

Download

This tutorial is available for download!

If you want to run and test all of this in a Java code:

download or clone git repository with Java 8 tutorials