Generate Random bytes in Java

In order to generate random bytes in Java, we use the nextBytes() method. The java.util.Random.nextBytes() method generates random bytes and provides it to the user defined byte array.

Declaration − The java.util.Random.nextBytes() method is declared as follows −

public void nextBytes(byte[] bytes)

where bytes is the byte array.

Let us see a program to generate random bytes in Java −

Example

 Live Demo

import java.util.Random; public class Example {    public static void main(String[] args) {       Random rd = new Random();       byte[] arr = new byte[7];       rd.nextBytes(arr);       System.out.println(arr);    } }

Output

[B@15db9742

Note − The output might vary on Online Compilers.