Java by API/java.io/Console

Console: format(String fmt, Object... args)

 
import java.io.Console;
import java.io.IOException;
import java.util.Arrays;
public class Main {
  public static void main(String args[]) throws IOException {
    Console c = System.console();
    if (c == null) {
      System.err.println("No console.");
      System.exit(1);
    }
    String login = c.readLine("Enter your login: ");
    char[] oldPassword = c.readPassword("Enter your old password: ");
    if (verify(login, oldPassword)) {
      boolean noMatch;
      do {
        char[] newPassword1 = c.readPassword("Enter your new password: ");
        char[] newPassword2 = c.readPassword("Enter new password again: ");
        noMatch = !Arrays.equals(newPassword1, newPassword2);
        if (noMatch) {
          c.format("Passwords don"t match. Try again.%n");
        } else {
          change(login, newPassword1);
          c.format("Password for %s changed.%n", login);
        }
        Arrays.fill(newPassword1, " ");
        Arrays.fill(newPassword2, " ");
      } while (noMatch);
    }
    Arrays.fill(oldPassword, " ");
  }
  // Dummy verify method.
  static boolean verify(String login, char[] password) {
    return true;
  }
  // Dummy change method.
  static void change(String login, char[] password) {
  }
}

Console: readLine(String fmt, Object... args)

 
import java.io.Console;
import java.io.IOException;
import java.util.Arrays;
public class Main {
  public static void main(String args[]) throws IOException {
    Console c = System.console();
    if (c == null) {
      System.err.println("No console.");
      System.exit(1);
    }
    String login = c.readLine("Enter your login: ");
    char[] oldPassword = c.readPassword("Enter your old password: ");
    if (verify(login, oldPassword)) {
      boolean noMatch;
      do {
        char[] newPassword1 = c.readPassword("Enter your new password: ");
        char[] newPassword2 = c.readPassword("Enter new password again: ");
        noMatch = !Arrays.equals(newPassword1, newPassword2);
        if (noMatch) {
          c.format("Passwords don"t match. Try again.%n");
        } else {
          change(login, newPassword1);
          c.format("Password for %s changed.%n", login);
        }
        Arrays.fill(newPassword1, " ");
        Arrays.fill(newPassword2, " ");
      } while (noMatch);
    }
    Arrays.fill(oldPassword, " ");
  }
  // Dummy verify method.
  static boolean verify(String login, char[] password) {
    return true;
  }
  // Dummy change method.
  static void change(String login, char[] password) {
  }
}

Console: readPassword(String fmt, Object... args)

 
import java.io.Console;
import java.io.IOException;
import java.util.Arrays;
public class Main {
  public static void main(String args[]) throws IOException {
    Console c = System.console();
    if (c == null) {
      System.err.println("No console.");
      System.exit(1);
    }
    String login = c.readLine("Enter your login: ");
    char[] oldPassword = c.readPassword("Enter your old password: ");
    if (verify(login, oldPassword)) {
      boolean noMatch;
      do {
        char[] newPassword1 = c.readPassword("Enter your new password: ");
        char[] newPassword2 = c.readPassword("Enter new password again: ");
        noMatch = !Arrays.equals(newPassword1, newPassword2);
        if (noMatch) {
          c.format("Passwords don"t match. Try again.%n");
        } else {
          change(login, newPassword1);
          c.format("Password for %s changed.%n", login);
        }
        Arrays.fill(newPassword1, " ");
        Arrays.fill(newPassword2, " ");
      } while (noMatch);
    }
    Arrays.fill(oldPassword, " ");
  }
  // Dummy verify method.
  static boolean verify(String login, char[] password) {
    return true;
  }
  // Dummy change method.
  static void change(String login, char[] password) {
  }
}