Java Utility Library

Java Random - nextBytes() Method

The java.util.Random.nextBytes() method is used to generate random bytes and places them into a user-supplied byte array. The number of random bytes produced is equal to the length of the byte array.

Syntax

public void nextBytes(byte[] bytes)

Parameters

bytes Specify the byte array to fill with random bytes.

Return Value

void type.

Exception

Throws NullPointerException, if the byte array is null.

Example:

In the example below, the java.util.Random.nextBytes() method is used to generate random bytes and places them into a given byte array.

import java.util.*;
import java.util.stream.LongStream;

public class MyClass {
  public static void main(String[] args) {
    //creating a random object
    Random rand = new Random();

    //creating a byte array
    byte[] Arr = new byte[10];

    //place random bytes in the array
    rand.nextBytes(Arr);

    //printing the array
    System.out.println("Arr contains:"); 
    for(byte i: Arr)
      System.out.println(" " + i); 
  }
}

One of the possible outcome is given below:

Arr contains:
 101
 -81
 4
 -112
 -70
 -9
 107
 30
 -18
 -86

❮ Java.util - Random