In Java, the getInstance() method is used to get the instance of the SecureRandom class. If we create an instance of the SecureRandom class using a new operator, it will use the SHA1PRNG algorithm. We can provide an algorithm name to the getInstance() method. The SecureRandom class offers this method, which consists of methods to generate substantial random numbers.
SecureRandom.getInstance("algorithm name", "algorithm provider")
algorithm name: This is the name of the algorithm. A NoSuchAlgorithmException is thrown if the algorithm is not found.algorithm provider: This is the name of the algorithm provider. A NoSuchProviderException is thrown if the provider is not found in the list of registered security providers.This method returns a SecuredRandom object.
import java.security.*;import java.util.*;public class main {public static void main(String[] argv){try{//create instance of securerandom with new operatorSecureRandom rndm = new SecureRandom();//create instance of securerandom with getInstance methodSecureRandom rndm1 = SecureRandom.getInstance("NativePRNG", "SUN");//get random integerSystem.out.println(rndm1.nextInt());}catch(Exception e){System.out.println("Exception is thrown");}}}
try/catch block, since the getInstance() method throws an exception.SecureRandom object, rndm, using the new operator.SecureRandom object, rndm1, using the getInstance() method. Next, we pass the algorithm name as NativePRNG and provider as SUN.nextInt() method on rndm1 object.Free Resources