File Info
| Exam | Java SE 8 Programmer II |
| Number | 1z0-809 |
| File Name | Oracle.1z0-809.PracticeTest.2018-08-01.48q.tqb |
| Size | 304 KB |
| Posted | Aug 01, 2018 |
| Download | Oracle.1z0-809.PracticeTest.2018-08-01.48q.tqb |
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Demo Questions
Question 1
Given:
public 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 K getKey () (return key;)
public V getValue () (return value;)
}
Which option fails?
- Foo<String, Integer> mark = new Foo<String, Integer> (“Steve”, 100););
- Foo<String, String> pair = Foo.<String>twice (“Hello World!”);
- Foo percentage = new Foo(97, 32);
- Foo<String, String> grade = new Foo <> (“John”, “A”);
Correct answer: C
Question 2
Given the code fragment:
Stream<List<String>> iStr= Stream.of (
Arrays.asList (“1”, “John”),
Arrays.asList (“2”, null)0;
Stream<<String> nInSt = iStr.flatMapToInt ((x) -> x.stream ());
nInSt.forEach (System.out :: print);
What is the result?
- 1John2null
- 12
- A NullPointerException is thrown at run time.
- A compilation error occurs.
Correct answer: D
Question 3
Given the code fragment:
Path file = Paths.get (“courses.txt”);
// line n1
Assume the courses.txt is accessible.
Which code fragment can be inserted at line n1 to enable the code to print the content of the courses.txt file?
- List<String> fc = Files.list(file);fc.stream().forEach (s - > System.out.println(s));
- Stream<String> fc = Files.readAllLines (file);fc.forEach (s - > System.out.println(s));
- List<String> fc = readAllLines(file);fc.stream().forEach (s - > System.out.println(s));
- Stream<String> fc = Files.lines (file);fc.forEach (s - > System.out.println(s));
Correct answer: D
