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Q11. 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
Q12. Given:
class CheckClass {
public static int checkValue (String s1, String s2) {
return s1 length() – s2.length();
}
}
and the code fragment:
String[] strArray = new String [] {“Tiger”, “Rat”, “Cat”, “Lion”}
//line n1
for (String s : strArray) {
System.out.print (s + “ “);
}
Which code fragment should be inserted at line n1 to enable the code to print Rat Cat Lion Tiger?
A. Arrays.sort(strArray, CheckClass : : checkValue);
B. Arrays.sort(strArray, (CheckClass : : new) : : checkValue);
C. Arrays.sort(strArray, (CheckClass : : new).checkValue);
D. Arrays.sort(strArray, CheckClass : : new : : checkValue);
Answer: D
Q13. 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
Q14. Given that course.txt is accessible and contains:
Course : : Java
and given the code fragment:
public static void main (String[ ] args) {
int i;
char c;
try (FileInputStream fis = new FileInputStream (“course.txt”);
InputStreamReader isr = new InputStreamReader(fis);) {
while (isr.ready()) { //line n1
isr.skip(2);
i = isr.read ();
c = (char) i;
System.out.print(c);
}
} catch (Exception e) {
e.printStackTrace();
}
}
What is the result?
A. ur :: va
B. ueJa
C. The program prints nothing.
D. A compilation error occurs at line n1.
Answer: A
Q15. Given:
What is the result?
A. 10 : 22 : 20
B. 10 : 22 : 22
C. 10 : 22 : 6
D. 10 : 30 : 6
Answer: B
Q16. Given:
public interface Moveable<Integer> {
public default void walk (Integer distance) {System.out.println(“Walking”);)
public void run(Integer distance);
}
Which statement is true?
A. Moveable can be used as below:
Moveable<Integer> animal = n - > System.out.println(“Running” + n);
animal.run(100);
animal.walk(20);
B. Moveable can be used as below:
Moveable<Integer> animal = n - > n + 10;
animal.run(100);
animal.walk(20);
C. Moveable can be used as below:
Moveable animal = (Integer n) - > System.out.println(n);
animal.run(100);
Moveable.walk(20);
D. Movable cannot be used in a lambda expression.
Answer: B
Q17. Given:
What is the result?
A. 6 7 8
B. 7 8 9
C. 0 1 2
D. 6 8 10
E. Compilation fails
Answer: A
Q18. 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
Q19. Which two are Java Exception classes?
A. SercurityException
B. DuplicatePathException
C. IllegalArgumentException
D. TooManyArgumentsException
Answer: A,C
Q20. Given:
public final class IceCream {
public void prepare() {}
}
public class Cake {
public final void bake(int min, int temp) {}
public void mix() {}
}
public class Shop {
private Cake c = new Cake ();
private final double discount = 0.25;
public void makeReady () { c.bake(10, 120); }
}
public class Bread extends Cake {
public void bake(int minutes, int temperature) {}
public void addToppings() {}
}
Which statement is true?
A. A compilation error occurs in IceCream.
B. A compilation error occurs in Cake.
C. A compilation error occurs in Shop.
D. A compilation error occurs in Bread
E. All classes compile successfully.
Answer: D