Loading 1 GB file using BufferedSource

Main.java

package test;

import com.google.common.base.CharMatcher;
import com.google.common.base.Stopwatch;
import okio.BufferedSource;
import okio.Okio;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Paths;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedSource source = Okio.buffer(Okio.source(Paths.get("<place 1 gb file here>")));
        CharMatcher matcher = CharMatcher.is('\n');
        long lineCount = 0;
        Stopwatch watch = Stopwatch.createStarted();
        while(!source.exhausted()) {
            lineCount += matcher.countIn(source.readString(StandardCharsets.US_ASCII));
        }
        System.out.println(lineCount);
        System.out.println("Finished in " + watch.stop());
    }
}