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Java IO & NIO - Files.readAllBytes() Examples

[Last Updated: Nov 8, 2025]

Java IO & NIO Java Java API 

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Class:

java.nio.file.Files

java.lang.Objectjava.lang.Objectjava.nio.file.Filesjava.nio.file.FilesLogicBig

Method:

public static byte[] readAllBytes(Path path)
                           throws IOException

Reads all the bytes from a file.

Parameters:
path - the path to the file
Returns:
a byte array containing the bytes read from the file


Examples


package com.logicbig.example.files;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

public class ReadAllBytesExample {

    public static void main(String... args) throws IOException {
        Path path = Files.createTempFile("test-file", ".txt");
        //write
        Files.write(path, "Some test data..".getBytes());
        //read
        byte[] bytes = Files.readAllBytes(path);
        System.out.println(new String(bytes));
    }
}

Output

Some test data..

See Also