In most examples throughout this article, we’ll read a text file with filenamefileTest.txtthat contains one line: Hello, world! For a few examples, we’ll use a different file; in these cases, we’ll mention the file and its contents explicitly. 2.2. Helper Method We’ll use a set...
import java.nio.file.Files; import java.nio.file.Paths; import java.util.stream.Stream; public class TestReadFile { public static void main(String args[]) { String fileName = "c://lines.txt"; //read file into stream, try-with-resources try (Stream<String> stream = Files.lines(Paths....
ReadFileLineByLineUsingScanner.java packagecom.journaldev.readfileslinebyline;importjava.io.File;importjava.io.FileNotFoundException;importjava.util.Scanner;publicclassReadFileLineByLineUsingScanner{publicstaticvoidmain(String[]args){try{Scannerscanner=newScanner(newFile("sample.txt"));while(scanner.hasNe...
In this Java tutorial, we will learn toread a text file line-by-linemethods such asStreamsorFileReader. We will also learn to iterate through lines and filter the file content based on some conditions. 1.Files.lines()– Stream through Lines of a File in Java 8 TheFiles.lines()is a new...
UPDATE: In Java 8 you can do try(Stream<String>stream=Files.lines(Paths.get(fileName))){stream.forEach(System.out::println);} FileReader won't let you specify the encoding, useInputStreamReaderinstead if you need to specify it:
import java.io.FileReader; import java.io.IOException; /** * Read contents of a File line by line using BufferedReader * www.tutorialkart.com */ public class Example { public static void main(String args[]){ String filename = "samplefile.txt"; ...
Error if i delete line 1 and 2 and the alst line in my textfile: "Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 12 at java.lang.String.substring(String.java:1963) at packagepackagechain.test4.main(test4.java:18)" Error if I add lin...
Let’s explore theBufferedReaderclass which will allow us to read file line by line.It has the advantage of not storing the whole file in memory. We can use theQueuewhich is a FIFO structure. While we read the file we will start removing the first element as soon as the Queuesize reac...
My goal is that a text file has either a 001 or a 002 or 0003 as their first word. Then, following the word is a letter. I want to be able to identify all the letters that are in a line that start with 001, they all are merged into one variable to be displayed in a ...
1Files.lines(Paths.get("Nio.java"))2.map(String::trim)3.forEach(System.out::println); The above reads the file “Nio.java”, callstrim()on every line, and then prints out the lines. Notice thatSystem.out::printlnrefers to theprintlnmethod on an instance ofPrintStream. ...