NullableBoolean.java

import org.jetbrains.annotations.Nullable;

import java.lang.Boolean;
import java.util.List;

class Foo {

  public static void main(@Nullable Boolean hasMissingGems, List<String> missing) {
    if (hasMissingGems != null && hasMissingGems) {
      return;
    }

    if (hasMissingGems == null && missing.size() > 0) {

    }

  }
  public static void main2(@Nullable Boolean hasMissingGems, List<String> missing) {
    if ((hasMissingGems != null && hasMissingGems) || (hasMissingGems == null && missing.size() > 0)) {

    }

  }
  public static void main3(Boolean b) {
    if (b == Boolean.FALSE) {
      System.out.println();
    } else if (b == Boolean.TRUE) {
      System.out.println();
    }
  }

}