Free Oracle 1z0-809 Exam Dumps Questions & Answers

Given the code fragments:
4. void doStuff() throws ArithmeticException, NumberFormatException, Exception {
5. if (Math.random() >-1 throw new Exception ("Try again");
6. }
and
24. try {
25. doStuff ( ):
26. } catch (ArithmeticException | NumberFormatException | Exception e) {
27. System.out.println (e.getMessage()); }
28. catch (Exception e) {
29. System.out.println (e.getMessage()); }
30. }
Which modification enables the code to print Try again?

• A.  Replace line 26 with:} catch (ArithmeticException | NumberFormatException e) {
• B.  Replace line 27 with:throw e;
• C.  Replace line 26 with:} catch (Exception | ArithmeticException | NumberFormatException e) {
• D.  Comment the lines 28, 29 and 30.

Given:

and the code fragment:

What is the result?

• A.  A compilation error occurs at line n1.
• B.  A compilation error occurs because the try block doesn't have a catch or finally block.
• C.  A compilation error occurs at line n2.
• D.  The program compiles successfully.

Given:

From what threading problem does the program suffer?

• A.  race condition
• B.  deadlock
• C.  starvation
• D.  livelock

Which two statements are true about synchronization and locks? (Choose two.)

• A.  A thread automatically acquires the intrinsic lock on a synchronized statement when executed.
• B.  A thread automatically acquires the intrinsic lock on a synchronized method's object when entering that method.
• C.  A thread exclusively owns the intrinsic lock of an object between the time it acquires the lock and the time it releases it.
• D.  The intrinsic lock will be retained by a thread if return from a synchronized method is caused by an uncaught exception.
• E.  Threads cannot acquire intrinsic locks on classes.

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.close()) { //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.  A compilation error occurs at line n1.
• B.  ur :: va
• C.  ueJa
• D.  The program prints nothing.