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public final class Password {
  private void setPassword(byte[] pass) throws Exception {
    bytes[] encrypted = encrypt(pass); //arbitrary encryption scheme
    clearArray(pass);      
    saveBytes(encrypted,"credentials.pw"); //encrypted password to credentials.pw
  }

  private boolean checkPassword(byte[] pass) throws Exception {
    boolean arrays_equal;
    byte[] encrypted = loadBytes("credentials.pw"); //load the encrypted password
    byte[] decrypted = decrypt(encrypted);
    arrays_equal = Arrays.equal(decrypted, pass);
    clearArray(decrypted);
    clearArray(pass);
    return arrays_equal;
  }

  private clearArray(byte[] a) {
    //set all of the elements in a to zero
  }
}