1Z0-809 Free Practice Test

Given the code fragment:

What is the result?

1. A. DavidDavid[Susan, Allen]
2. B. SusanSusan[Susan, Allen]
3. C. SusanAllen [David]
4. D. DavidAllen [Susan]
5. E. SusanAllen[Susan, David]

Correct Answer: C

Given:

and the code fragment:

What is the result?

1. A. 0.0
2. B. 1500.0
3. C. A compilation error occur
4. D. 2000.0

Correct Answer: D

Given:

From what threading problem does the program suffer?

1. A. race condition
2. B. deadlock
3. C. starvation
4. D. livelock

Correct Answer: B

Given the code fragment:
Path p1 = Paths.get(“/Pics/MyPic.jpeg”); System.out.println (p1.getNameCount() + “:” + p1.getName(1) +
“:” + p1.getFileName());
Assume that the Pics directory does NOT exist.
What is the result?

1. A. An exception is thrown at run time.
2. B. 2:MyPic.jpeg: MyPic.jpeg
3. C. 1:Pics:/Pics/ MyPic.jpeg
4. D. 2:Pics: MyPic.jpeg

Correct Answer: B

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?

1. A. static void fly (Consumer<Bird> bird) { bird :: fly ();}
2. B. static void fly (Consumer<? extends Bird> bird) {bird.accept( ) fly ();}
3. C. static void fly (Supplier bird) { bird.get( ) fly ();}
4. D. static void fly (Supplier<? extends Bird> bird) { LOST

Correct Answer: C