Modern Java NIO: java.nio.file.Path and java.nio.file.Files

Intermediate13 min read•Updated: 2026-10-22

🚀 Modern Java NIO: Path and Files Utility (Java 11+)

Introduction

Modern Java development prefers Java NIO.2 (java.nio.file) over legacy java.io.File. Classes like Path and Files allow complete file operations in a single line of code!

⚡ Reading and Writing Files in One Line

1import java.nio.file.Path;
2import java.nio.file.Paths;
3import java.nio.file.Files;
4import java.io.IOException;
5import java.util.List;
6 
7public class NioDemo {
8    public static void main(String[] args) throws IOException {
9        Path filePath = Paths.get("notes.txt");
10 
11        // 1. One-line file write (Java 11+):
12        Files.writeString(filePath, "MSK Institute - Modern Java Track 2026\nSecond Line");
13 
14        // 2. One-line file read into String:
15        String content = Files.readString(filePath);
16        System.out.println("Content:\n" + content);
17 
18        // 3. One-line read all lines into List:
19        List<String> lines = Files.readAllLines(filePath);
20        System.out.println("Total lines: " + lines.size());
21    }
22}

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Object Serialization with Serializable, ObjectOutputStream, and transient Keyword

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File Streams: FileReader, FileWriter, BufferedReader, and BufferedWriter	Object Serialization with Serializable, ObjectOutputStream, and transient Keyword

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Object Serialization with Serializable, ObjectOutputStream, and transient Keyword

Modern Java NIO: java.nio.file.Path and java.nio.file.Files

Intermediate13 min read•Updated: 2026-10-22

Study Materials

🚀 Modern Java NIO: Path and Files Utility (Java 11+)

Introduction

Modern Java development prefers Java NIO.2 (java.nio.file) over legacy java.io.File. Classes like Path and Files allow complete file operations in a single line of code!

⚡ Reading and Writing Files in One Line

1import java.nio.file.Path;
2import java.nio.file.Paths;
3import java.nio.file.Files;
4import java.io.IOException;
5import java.util.List;
6 
7public class NioDemo {
8    public static void main(String[] args) throws IOException {
9        Path filePath = Paths.get("notes.txt");
10 
11        // 1. One-line file write (Java 11+):
12        Files.writeString(filePath, "MSK Institute - Modern Java Track 2026\nSecond Line");
13 
14        // 2. One-line file read into String:
15        String content = Files.readString(filePath);
16        System.out.println("Content:\n" + content);
17 
18        // 3. One-line read all lines into List:
19        List<String> lines = Files.readAllLines(filePath);
20        System.out.println("Total lines: " + lines.size());
21    }
22}

Next Lesson

Object Serialization with Serializable, ObjectOutputStream, and transient Keyword

Continue learning with hands-on practice, examples, and exercises in the upcoming topic.

Related Lessons

Previous Lesson	Next Lesson
File Streams: FileReader, FileWriter, BufferedReader, and BufferedWriter	Object Serialization with Serializable, ObjectOutputStream, and transient Keyword

Practice Quiz

Test your understanding of this lesson with 1 questions. Each question has one correct answer.

Previous Next