File Info
| Exam | Java SE 8 Programmer II |
| Number | 1z0-809 |
| File Name | Oracle.1z0-809.Pass4Sure.2019-02-04.54q.tqb |
| Size | 2 MB |
| Posted | Feb 04, 2019 |
| Download | Oracle.1z0-809.Pass4Sure.2019-02-04.54q.tqb |
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Demo Questions
Question 1
Given:
IntStream stream = IntStream.of (1,2,3);
IntFunction<Integer> inFu= x -> y -> x*y; //line n1
IntStream newStream = stream.map(inFu.apply(10)); //line n2
newStream.forEach(System.output::print);
Which modification enables the code fragment to compile?
- Replace line n1 with:IntFunction<UnaryOperator> inFu = x -> y -> x*y;
- Replace line n1 with:IntFunction<IntUnaryOperator> inFu = x -> y -> x*y;
- Replace line n1 with:BiFunction<IntUnaryOperator> inFu = x -> y -> x*y;
- Replace line n2 with:IntStream newStream = stream.map(inFu.applyAsInt (10));
Correct answer: B
Question 2
Given the code fragment:
public class Foo {
public static void main (String [ ] args) {
Map<Integer, String> unsortMap = new HashMap< > ( );
unsortMap.put (10, “z”);
unsortMap.put (5, “b”);
unsortMap.put (1, “d”);
unsortMap.put (7, “e”);
unsortMap.put (50, “j”);
Map<Integer, String> treeMap = new TreeMap <Integer, String> (new
Comparator<Integer> ( ) {
@Override public int compare (Integer o1, Integer o2) {return o2.compareTo
(o1); } } );
treeMap.putAll (unsortMap);
for (Map.Entry<Integer, String> entry : treeMap.entrySet () ) {
System.out.print (entry.getValue () + “ “);
}
}
}
What is the result?
- A compilation error occurs.
- d b e z j
- j z e b d
- z b d e j
Correct answer: C
Question 3
Given:
class Bird {
public void fly () { System.out.print(“Can fly”); }
}
class Penguin extends Bird {
public void fly () { System.out.print(“Cannot fly”); }
}
and the code fragment:
class Birdie {
public static void main (String [ ] args) {
fly( ( ) -> new Bird ( ));
fly (Penguin : : new);
}
/* line n1 */
}
Which code fragment, when inserted at line n1, enables the Birdie class to compile?
- static void fly (Consumer<Bird> bird) {bird :: fly ();}
- static void fly (Consumer<? extends Bird> bird) {bird.accept( ) fly ();}
- static void fly (Supplier<Bird> bird) {bird.get( ) fly ();}
- static void fly (Supplier<? extends Bird> bird) {LOST
Correct answer: C
