OnJava8-Examples/annotations/PasswordUtils.java

// annotations/PasswordUtils.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;

public class PasswordUtils {
  @UseCase(id = 47, description =
  "Passwords must contain at least one numeric")
  public boolean validatePassword(String passwd) {
    return (passwd.matches("\\w*\\d\\w*"));
  }
  @UseCase(id = 48)
  public String encryptPassword(String passwd) {
   return new StringBuilder(passwd)
    .reverse().toString();
  }
  @UseCase(id = 49, description =
  "New passwords can't equal previously used ones")
  public boolean checkForNewPassword(
    List<String> prevPasswords, String passwd) {
    return !prevPasswords.contains(passwd);
  }
}