Exam 1z0-829 topic 1 question 38 discussion

the right answer is B. wTablewChair TableChair

B tested correct

package streampac; import java.util.List; public class Q38 { public String attach1 ( List<String> data) { return data.parallelStream().reduce("w", (n,m) -> n+m, String ::concat); } public String attach2 ( List<String> data) { return data.parallelStream().reduce( (l,p) -> l + p).get(); } public static void main(String[] args) { // TODO Auto-generated method stub Q38 t= new Q38(); var list = List.of("Table", "chair"); String x= t.attach1(list); String y= t.attach2(list); System.out.print(x +" " +y); } } //the output is B wTablewchair Tablechair

The answer is A. You can't use a numeric in (1,p)

attach1 -----> identity is w accumulator --> combines two elements into one n and m combiner ---->combines results: wTablewChair. attach2 ------>no identity provided only a combiner :TableChair

The answer is A. You can't use a numeric literal for the accumulated result variable. The code won't compile.

Compilation error

A This code has a compilation error because the reduce method expects elements of the same type as the accumulator function's arguments.

B correct! verified in online compiler.