Java / Java8 streams
What is a Predicate interface?
A Predicate is a functional interface that represents a function, which takes an Object and returns a boolean. It is used in several Stream methods like filter(), which uses Predicate to filter unwanted elements.
public boolean test(T object){ return boolean; }
Predicate has test() method which takes an object and returns a boolean. The method is used to test a condition if it passes; it returns true otherwise false.
public class Java8PredicateExample { public static void main(String[] args) { List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); List<Integer> collect = list.stream().filter(x -> x > 5).collect(Collectors.toList()); System.out.println(collect); // [6, 7, 8, 9, 10] } }
In the above example, filter method takes a predicate x -> x > 5 as argument and filters value if it is less than 5 or not.
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