public class BCryptDemo {
 public static void main(String[] args) {
 　　// Hash a password for the first time
 　　　　String password = "testpassword";
　　　　String hashed = BCrypt.hashpw(password, BCrypt.gensalt());
　　　　System.out.println(hashed);
　　// gensalt's log_rounds parameter determines the complexity
　　// the work factor is 2**log_rounds, and the default is 10
　　String hashed2 = BCrypt.hashpw(password, BCrypt.gensalt(12));
 
　　// Check that an unencrypted password matches one that has
　　// previously been hashed
　　String candidate = "testpassword";
　　//String candidate = "wrongtestpassword";
　　if (BCrypt.checkpw(candidate, hashed))
　　　　System.out.println("It matches");
　　else
　　System.out.println("It does not match");
　　}
}