Random nextBytes() method in Java with Examples

Last Updated : 07 Jan, 2019

The nextBytes() method of Random class places the generated random bytes into an user-supplied byte array.

Syntax:

  public void nextBytes(byte[] bytes)

Parameters: The function accepts a single parameter bytes which is the non-null byte array in which to put the random bytes.

Return Value: This method has no return value.

Exception: The function does not throws any exception.

Program below demonstrates the above mentioned function:

Program 1:

   // program to demonstrate the 
// function java.util.Random.nextBytes() 
  
import java.util.*; 
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create random object 
        Random r = new Random(); 
  
        // create byte array 
        byte[] bytes = new byte[10]; 
  
        // put the next byte in the array 
        r.nextBytes(bytes); 
  
        // print random value of array 
        System.out.print("Random bytes = [ "); 
        for (int i = 0; i < bytes.length; i++) { 
            System.out.printf("%d ", bytes[i]); 
        } 
        System.out.print("]"); 
    } 
} 
 
  

Output:

  Random bytes = [ -90 -126 -75 50 -117 -13 -55 -63 -117 47 ]

Program 2:

   // program to demonstrate the 
// function java.util.Random.nextBytes() 
  
import java.util.*; 
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create random object 
        Random r = new Random(); 
  
        // create byte array 
        byte[] bytes = new byte[15]; 
  
        // put the next byte in the array 
        r.nextBytes(bytes); 
  
        // print random value of array 
        System.out.print("Random bytes = [ "); 
        for (int i = 0; i < bytes.length; i++) { 
            System.out.printf("%d ", bytes[i]); 
        } 
        System.out.print("]"); 
    } 
} 
 
  

Output:

  Random bytes = [ -82 75 -105 41 -34 94 81 10 -107 -46 37 4 -1 100 -119 ]

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Twinkl Bajaj

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