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Java Random nextBytes() Method with Examples

Random Class nextBytes() method: Here, we are going to learn about the nextBytes() method of Random Class with its syntax and example.
Submitted by Preeti Jain, on March 23, 2020

Random Class nextBytes() method

• nextBytes() method is available in java.util package.
• nextBytes() method is used to generate the next bytes randomly and put them into the given user-defined array (by).
• nextBytes() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• nextBytes() method does not throw an exception at the time of copying bytes.

Syntax:

    public void nextBytes(byte[] by);

Parameter(s):

• byte[] by – represents the byte array to contain random bytes.

Return value:

The return type of the method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void nextBytes(byte[] by) method of 
// Random

import java.util.*;

public class NextBytesOfRandom {
 public static void main(String args[]) {
  // Instantiates Random object
  Random ran = new Random();

  // Instantiates user defined 
  // array (by_arr)
  byte[] by_arr = new byte[20];

  // By using nextBytes() method isto
  // create random bytes and put them
  // in the user-defined byte array
  ran.nextBytes(by_arr);

  // Display 
  System.out.println("ran.nextBytes(by_arr): " + by_arr);
 }
}

Output

ran.nextBytes(by_arr): [B@7bfcd12c