1Z0-809 Exam Questions and Answers | Exam-Dumps.net (Page: 2)

QUESTION: 6

Given:
public class Counter {
public static void main (String[ ] args) {
int a = 10;
int b = -1;
assert (b >=1) : “Invalid Denominator”;
int с = a / b;
System.out.println (c);
}
}

What is the result of running the code with the –ea option?

-10
0
An AssertionError is thrown.
A compilation error occurs.

Answer(s): C

Reveal Solution Next Question

QUESTION: 7

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

Answer(s): C

Reveal Solution Next Question

QUESTION: 8

Given:
1. abstract class Shape {
2. Shape ( ) { System.out.println (“Shape”); }
3. protected void area ( ) { System.out.println (“Shape”); }
4. }
5.
6. class Square extends Shape {
7. int side;
8. Square int side {
9. /* insert code here */
10. this.side = side;
11. }
12. public void area ( ) { System.out.println (“Square”); }
13. }
14. class Rectangle extends Square {
15. int len, br;
16. Rectangle (int x, int y) {
17. /* insert code here */
18. len = x, br = y;
19. }
20. void area ( ) { System.out.println (“Rectangle”); }
21. }

Which two modifications enable the code to compile? (Choose two.)

At line 1, remove abstract
At line 9, insert super ( );
At line 12, remove public
At line 17, insert super (x);
At line 17, insert super (); super.side = x;
At line 20, use public void area ( ) {

Answer(s): D,F

Reveal Solution Next Question

QUESTION: 9

Given:
class Sum extends RecursiveAction { //line n1
static final int THRESHOLD_SIZE = 3;
int stIndex, lstIndex;
int [ ] data;
public Sum (int [ ]data, int start, int end) {
this.data = data;
this stIndex = start;
this. lstIndex = end;
}
protected void compute ( ) {
int sum = 0;
if (lstIndex – stIndex <= THRESHOLD_SIZE) {
for (int i = stIndex; i < lstIndex; i++) {
sum += data [i];
}
System.out.println(sum);
} else {
new Sum (data, stIndex + THRESHOLD_SIZE, lstIndex).fork( );
new Sum (data, stIndex,
Math.min (lstIndex, stIndex + THRESHOLD_SIZE)
).compute ();
}
}
}

and the code fragment:

ForkJoinPool fjPool = new ForkJoinPool ( );
int data [ ] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
fjPool.invoke (new Sum (data, 0, data.length));

and given that the sum of all integers from 1 to 10 is 55. Which statement is true?