Random nextBytes() method in Java with Examples Last Updated : 07 Jan, 2019 Comments Improve Suggest changes Like Article Like Report 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: Java // 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: Java // 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 ] Comment More infoAdvertise with us Next Article Random nextBytes() method in Java with Examples T Twinkl Bajaj Follow Improve Article Tags : Misc Java Java-Functions Java-Random Practice Tags : JavaMisc Similar Reads SecureRandom nextBytes() method in Java with Examples The nextBytes() method of java.security.SecureRandom class is used to generate a user-specified number of random bytes. If a call to setSeed had not occurred previously, the first call to this method forces this SecureRandom object to seed itself. This self-seeding will not occur if setSeed was prev 3 min read Random next() method in Java with Examples The next() method of Random class returns the next pseudorandom value from the random number generator's sequence. Syntax: protected int next(int bits) Parameters: The function accepts a single parameter bits which are the random bits. Return Value: This method returns the next pseudorandom number. 1 min read Random nextDouble() method in Java with Examples The nextDouble() method of Random class returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence. Syntax: public double nextDouble() Parameters: The function does not accepts any parameter. Return Value: This method returns th 1 min read Random nextBoolean() method in Java with Examples The nextBoolean() method of Random class returns the next pseudorandom, uniformly distributed boolean value from the random number generator's sequence. Syntax: public boolean nextBoolean() Parameters: The function does not accepts any parameter. Return Value: This method returns the next pseudorand 1 min read Random nextFloat() method in Java with Examples The nextFloat() method of Random class returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from the random number generator's sequence. Syntax: public float nextFloat() Parameters: The function does not accepts any parameter. Return Value: This method returns the nex 1 min read Like