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In this guide, you will learn about the Files readAllBytes() method in Java programming and how to use it with an example.
1. Files readAllBytes() Method Overview
Definition:
The Files.readAllBytes() method reads all the bytes from a file. The method ensures that the file is closed when all bytes have been read or an I/O error, or other runtime error, occurs.
Syntax:
static byte[] readAllBytes(Path path)
Parameters:
- path: The path to the file.
Key Points:
- This method is intended for reading small files. Large files may lead to an OutOfMemoryError.
- It reads all the content of the file into memory, so it's not suitable for reading very large files.
- The method is useful when you need to quickly read a file's contents without any processing while reading.
2. Files readAllBytes() Method Example
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public class ReadAllBytesExample {
public static void main(String[] args) {
Path path = Paths.get("sample.txt");
try {
byte[] fileBytes = Files.readAllBytes(path);
String fileContent = new String(fileBytes);
System.out.println(fileContent);
} catch (IOException e) {
System.out.println("Error reading the file: " + e.getMessage());
}
}
}
Output:
Assuming sample.txt contains: Hello, World! The console output will be: Hello, World!
Explanation:
In this example, Files.readAllBytes() is used to read all the bytes from the file sample.txt. The bytes are then converted into a String for display.
The method provides a quick way to read the entire content of a file without having to loop through it. However, care should be taken not to use it for very large files as it reads the entire content into memory.
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