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Q31. Given:
What is the result?
A. The sum is 2
B. The sum is 14
C. The sum is 15
D. The loop executes infinite times
E. Compilation fails
Answer: E
Q32. The protected modifier on a Field declaration within a public class means that the field ______________.
A. Cannot be modified
B. Can be read but not written from outside the class
C. Can be read and written from this class and its subclasses only within the same package
D. Can be read and written from this class and its subclasses defined in any package
Answer: D
Reference:
http://beginnersbook.com/2013/05/java-access-modifiers/
Q33. Given:
public class MainMethod {
void main() {
System.out.println("one");
}
static void main(String args) {
System.out.println("two");
}
public static void main(String[] args) {
System.out.println("three");
}
void mina(Object[] args) {
System.out.println("four");
}
}
What is printed out when the program is excuted?
A. one
B. two
C. three
D. four
Answer: C
Q34. Given: A. ns = 50 S = 125 ns = 125 S = 125 ns = 100 S = 125
B. ns = 50 S = 125 ns = 125 S = 125 ns = 0 S = 125
C. ns = 50 S = 50 ns = 125 S = 125 ns = 100 S = 100
D. ns = 50 S = 50 ns = 125 S = 125 ns = 0 S = 125
Answer: B
Q35. Given the code fragment
Which code fragments, inserted independently, enable the code compile?
A. t.fvar = 200;
B. cvar = 400;
C. fvar = 200; cvar = 400;
D. this.fvar = 200; this.cvar = 400;
E. t.fvar = 200; Test2.cvar = 400;
F. this.fvar = 200;
Test2.cvar = 400;
Answer: B
Q36. Given:
public class product { int id; int price;
public Product (int id, int price) {
this.id = id;
this.price = price;
}
public String toString() { return id + “:” + price; }
}
and the code fragment:
List<Product> products = Arrays.asList(new Product(1, 10),
new Product (2, 30),
new Product (2, 30));
Product p = products.stream().reduce(new Product (4, 0), (p1, p2) -> {
p1.price+=p2.price;
return new Product (p1.id, p1.price);});
products.add(p);
products.stream().parallel()
.reduce((p1, p2) - > p1.price > p2.price ? p1 : p2)
.ifPresent(System.out: :println);
What is the result?
A. 2 : 30
B. 4 : 0
C. 4 : 60
D. 4 : 60
2 : 30
3 : 20
1 : 10
E.
The program prints nothing.
Answer: D
Q37. 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?
A. Replace line n1 with:
IntFunction<UnaryOperator> inFu = x -> y -> x*y;
B. Replace line n1 with:
IntFunction<IntUnaryOperator> inFu = x -> y -> x*y;
C. Replace line n1 with:
BiFunction<IntUnaryOperator> inFu = x -> y -> x*y;
D. Replace line n2 with:
IntStream newStream = stream.map(inFu.applyAsInt (10));
Answer: D
Q38. Given:
What is the result?
A. 10 : 22 : 20
B. 10 : 22 : 22
C. 10 : 22 : 6
D. 10 : 30 : 6
Answer: B
Q39. You want to create a singleton class by using the Singleton design pattern. Which two statements enforce the singleton nature of the design?
A. Make the class static.
B. Make the constructor private.
C. Override equals() and hashCode() methods of the java.lang.Object class.
D. Use a static reference to point to the single instance.
E. Implement the Serializable interface.
Answer: A,B
Q40. 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?
A. List<String> fc = Files.list(file); fc.stream().forEach (s - > System.out.println(s));
B. Stream<String> fc = Files.readAllLines (file); fc.forEach (s - > System.out.println(s));
C. List<String> fc = readAllLines(file); fc.stream().forEach (s - > System.out.println(s));
D. Stream<String> fc = Files.lines (file); fc.forEach (s - > System.out.println(s));
Answer: B
