List<Y> tmp= new DATA<Y>().findEntities();
List<X> tmp1 = new DATA<X>().findEntities().stream().filter(
IN (tmp) ???
).collect(Collectors.toList());
How to simulate a tipical IN clause (like in mysql or JPA) using a Predicate ?
I decided to update my comment to an answer. The lambda expression for your requested Predicate<Y>
(where Y should be a concrete type) looks as following:
element -> tmp.contains(element)
Because the collection's contains
method has the same signature as the predicate's test
method, you can use a method reference (here an instance method reference):
tmp::contains
A full example:
List<Number> tmp = Arrays.asList(1, 2, 3);
List<Integer> tmp1 = Arrays
.stream(new Integer[] { 1, 2, 3, 4, 5 })
.filter(tmp::contains)
.collect(Collectors.toList());
System.out.println(tmp1);
This prints
[1, 2, 3]
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