Exam 1z0-819 topic 1 question 100 discussion

Actual exam question from Oracle's 1z0-819

Question #: 100
Topic #: 1

Given TripleThis.java:

Compiling TripleThis.java gives this compiler warning:

Note: TripleThis.java uses unchecked or unsafe operations.

Which two replacements remove this compiler warning and prints 12? (Choose two.)

A. Replace line 12 with public static void printValue(Function f, int num) {
B. Replace line 12 with public static void printValue(Function f, T num) {
C. Replace line 9 with Function tripler = x —> { return (Integer) x * 3; }
D. Replace line 12 with public static void printValue(Function f, Integer num) {
E. Replace line 9 with Function tripler = x -> { return x * 3; }
F. Replace line 9 with Function tripler = x -> [ return x * 3; ]

Show Suggested Answer

Suggested Answer: AD 🗳️

by Stavok at July 18, 2023, 9:26 p.m.

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ASPushkin

1 year ago

This code doesn't compiled "T is not found" it will compile if written something like this public static <T extends Integer> void printValue(Function f, T num) { There is no correct answer This code, for example, remove the compile warning : public static void main(String[] args) { Function <Integer, Integer> triple = x -> { return x*3; }; MyClass.printValue(triple, 4); } public static void printValue(Function<Integer, Integer> f, int num) { System.out.println(f.apply(num)); }

upvoted 1 times

ASPushkin

7 months, 2 weeks ago

"T is not found" use bounded type parameters like <T extends Integer> or change T to Integer or int (A,D) "...uses unchecked or unsafe operations." the reason is using raw code use generics Function<Integer, Integer>

upvoted 1 times

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dilleman

1 year, 8 months ago

Tested, A and D

upvoted 2 times

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Stavok

1 year, 11 months ago

Selected Answer: AD

A & D are correct

upvoted 2 times

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