How to know if the list contains both elements that meet and that do not meet a condition, using stream?

I have a list of columns, I need to know if this list contains both columns that are keys as columns that are not keys.

  

I guarantee the existence of at least one column in the list

My column class:

public class Coluna {
  public boolean chave;
  public boolean isChave() { return chave; }
}

My verification is now:

List<Coluna> minhasColunas = ...;
Predicate<Coluna> ehChave = Coluna::isChave;
boolean possuiColunasMistas =
    minhasColunas.stream().anyMatch(ehChave) &&
    minhasColunas.stream().anyMatch(ehChave.negate());

Is there any more idiomatic way of doing this check? I found it very strange to go through two streams to get the result.

On a more imperative check, I would do the following:

List<Coluna> minhasColunas = ...;
boolean achouChave = false;
boolean achouNaoChave = false;
for (Coluna c: minhasColunas) {
  if (c.chave) {
    achouChave = true;
    if (achouNaoChave) {
      break;
    }
  } else {
    achouNaoChave = true;
    if (achouChave) {
      break;
    }
  }
}

boolean possuiColunasMistas = achouChave && achouNaoChave;

After creating the question, and chatting with @Anderson Carlos Woss , I ended up creating some test scenarios for that question. They are available here: link

So if you want to validate your own answer, implement the boolean possuiColunasMistas(List<Coluna> colunas) method and then just run the test cases with JUnit.