/**
* This example demonstrate the use of Predicate. Sum method is isolated from predicate validity logic,
* hence it be used multiple times with different predicate logic.
*/
public class PredicateExample {
public static void main(String[] args) {
List<Integer> integers = Arrays.asList(5, 3, 7, 1, 9, 4, 13, 6);
System.out.println("Sum of even numbers " + getSum(integers, (i) -> i % 2 == 0));
System.out.println("Sum of numbers greater than 5, " + getSum(integers, (i) -> i > 5));
}
public static int getSum(List<Integer> integerList, Predicate<Integer> predicate) {
int sum = 0;
for (Integer integer : integerList) {
if (integer == null || !predicate.test(integer)) {
continue;
}
sum += integer;
}
return sum;
}
}
