Skip to content

Yet another programming solutions log

Sample bits from programming for the future generations.

Technologies Technologies
  • Algorithms and Data Structures
  • Java Tutorials
  • JUnit Tutorial
  • MongoDB Tutorial
  • Quartz Scheduler Tutorial
  • Spock Framework Tutorial
  • Spring Framework
  • Bash Tutorial
  • Clojure Tutorial
  • Design Patterns
  • Developer’s Tools
  • Productivity
  • About
Expand Search Form

Java 8 read file into a String

farenda 2015-05-22 0

Problem:

How to read file into a String in Java 8?

Solution:

Using methods from Files and Paths classes available in Java 8.

package com.farenda.solved;

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

public class JavaSolved {

    // It's good to move such code to reusable methods
    private static String loadFile(String filename) throws IOException {
        // need to pass file encoding
        return new String(Files.readAllBytes(Paths.get(filename)),
                          StandardCharsets.UTF_8);
    }

    public static void main(String[] args) throws IOException {
        if (args.length == 0) {
            System.out.println("Run with a file as a parameter");
        } else {
            System.out.println("Reading from: " + args[0] + " using Java 8");
            System.out.println(loadFile(args[0]));
        }
    }
}

Result:

  1. Create sample file books.txt with the content:
    "Thinking in Java"
    "Head First Java"
    "Design Patterns: Elements of Reusable Object-Oriented Software"
    "Applying UML and Patterns"
    "Agile Software Development, Principles, Patterns, and Practices"
    
  2. Compile the code:
    $> javac src/com/farenda/solved/*.java -d out
    
  3. Run with the file as parameter
    $> java -cp out com.farenda.solved.JavaSolved books.txt
    
    Reading from: books.txt using Java 8
    "Thinking in Java"
    "Head First Java"
    "Design Patterns: Elements of Reusable Object-Oriented Software"
    "Applying UML and Patterns"
    "Agile Software Development, Principles, Patterns, and Practices"
    
Share with the World!
Categories Java Tags java8-files
Previous: Java 8 read lines from a text file
Next: Java primitive types default values

Recent Posts

  • Java 8 Date Time concepts
  • Maven dependency to local JAR
  • Caesar cipher in Java
  • Java casting trick
  • Java 8 flatMap practical example
  • Linked List – remove element
  • Linked List – insert element at position
  • Linked List add element at the end
  • Create Java Streams
  • Floyd Cycle detection in Java

Pages

  • About Farenda
  • Algorithms and Data Structures
  • Bash Tutorial
  • Bean Validation Tutorial
  • Clojure Tutorial
  • Design Patterns
  • Java 8 Streams and Lambda Expressions Tutorial
  • Java Basics Tutorial
  • Java Collections Tutorial
  • Java Concurrency Tutorial
  • Java IO Tutorial
  • Java Tutorials
  • Java Util Tutorial
  • Java XML Tutorial
  • JUnit Tutorial
  • MongoDB Tutorial
  • Quartz Scheduler Tutorial
  • Software Developer’s Tools
  • Spock Framework Tutorial
  • Spring Framework

Tags

algorithms bash bean-validation books clojure design-patterns embedmongo exercises git gof gradle groovy hateoas hsqldb i18n java java-basics java-collections java-concurrency java-io java-lang java-time java-util java-xml java8 java8-files junit linux lists log4j logging maven mongodb performance quartz refactoring regex rest slf4j solid spring spring-boot spring-core sql unit-tests

Yet another programming solutions log © 2021

sponsored
We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.Ok