I am moving to use Java11. Learning a new method Predicate.not, I found my current code to find only cat family as:
List<String> animals = List.of("cat", "leopard", "dog", "lion", "horse");
Predicate<String> cats = a -> !a.equals("dog") && !a.equals("horse");
Set<String> filterCat = animals.stream().filter(cats).collect(Collectors.toSet());
System.out.println(filterCat);
output is :
leopard, cat, lion
Now I am trying to use the new method and the output is coming incorrect. How do I correct it? What did I do wrong?
My later code:
Predicate<String> updatedCatFilter = Predicate.not(a -> a.equals("dog") && a.equals("horse"));
Set<String> catFamily = animals.stream().filter(updatedCatFilter).collect(Collectors.toSet());
System.out.println(filterCat);
But this outputs all my list now.
horse, leopard, cat, dog, lion