JavaSHA_256.java

// https://www.hackerrank.com/challenges/sha-256/problem

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Scanner;

public class JavaSHA_256 {
 public static void main(String[] args) throws NoSuchAlgorithmException {
 MessageDigest sha256 = MessageDigest.getInstance("sha-256");
 Scanner scanner = new Scanner(System.in);
 String message = scanner.nextLine();
 scanner.close();

 byte[] hash = sha256.digest(message.getBytes());
 String hashHexCode = toHex(hash);
 System.out.println(hashHexCode);
 }

 private static String toHex(byte[] array) {
 StringBuilder sb = new StringBuilder(2 * array.length);
 for(byte b : array) {
 sb.append(String.format("%02x", b&0xff));
 }
 return sb.toString();
 }
}