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Exam 1z0-809 topic 1 question 124 discussion

Actual exam question from Oracle's 1z0-809
Question #: 124
Topic #: 1
[All 1z0-809 Questions]

Given:

Which option fails?

  • A. Foo<String, Integer> mark = new Foo<String, Integer> ("Steve", 100);
  • B. Foo<String, String> pair = Foo.<String>twice ("Hello World!");
  • C. Foo<Object, Object> percentage = new Foo<String, Integer>("Steve", 100);
  • D. Foo<String, String> grade = new Foo <> ("John", "A");
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Suggested Answer: C 🗳️

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Tarik2190
Highly Voted 3 years, 2 months ago
Answer is C, class Foo<K,V>{ private K key; private V value; public Foo(K key, V value) { this.key = key; this.value = value; } public static <T> Foo<T,T> twice(T value) { return new Foo<T,T>(value,value); } } public class Test { public static void main (String[] args) throws InterruptedException { Foo<Object,Object> percentage = new Foo<String,Integer>("Steve",100); } }
upvoted 5 times
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pul26
Highly Voted 3 years, 7 months ago
Answer is C tested
upvoted 5 times
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steefaand
Most Recent 5 months, 4 weeks ago
Selected Answer: C
C is correct. You can't have Object on left side and String/Integer on right. You could have ? extends Object on left side and then it would compile.
upvoted 2 times
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WilsonKKerll
2 years, 4 months ago
Selected Answer: C
Answer is C.
upvoted 1 times
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Svetleto13
3 years, 2 months ago
C,tested
upvoted 3 times
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