Free Oracle 1Z0-851 Exam Dumps Questions & Answers

Given:
11.class Mammal { }
12.13.
class Raccoon extends Mammal {
14.Mammal m = new Mammal();
15.}
16.17.
class BabyRaccoon extends Mammal { } Which four statements are true? (Choose four.)

• A.  BabyRaccoon is-a Raccoon.
• B.  BabyRaccoon is-a Mammal.
• C.  BabyRaccoon is-a BabyRaccoon.
• D.  Raccoon has-a Mammal.
• E.  BabyRaccoon has-a Mammal.
• F.  Raccoon is-a Mammal.

Given:
5.import java.util.Date;
6.import java.text.DateFormat;
21.DateFormat df;
22.Date date = new Date();
23.// insert code here
24.String s = df.format(date);
Which code fragment, inserted at line 23, allows the code to compile?

• A.  df = Date.getFormat();
• B.  df = DateFormat.getInstance();
• C.  df = new DateFormat();
• D.  df = DateFormat.getFormat();
• E.  df = date.getFormat();

Which two statements are true? (Choose two.)

• A.  Deadlocking can occur only when the wait(), notify(), and notifyAll() methods are used incorrectly.
• B.  The JVM implementation guarantees that multiple threads cannot enter into a deadlocked state.
• C.  It is possible for a single-threaded application to deadlock if synchronized blocks are used incorrectly.
• D.  It is possible for more than two threads to deadlock at once.
• E.  If a piece of code is capable of deadlocking, you cannot eliminate the possibility of deadlocking by inserting invocations of Thread.yield().
• F.  Deadlocked threads release once their sleep() method's sleep duration has expired.

Given:
11.public static void main(String[] args) {
12.try {
13.args = null;
14.args[0] = "test";
15.System.out.println(args[0]);
16.} catch (Exception ex) {
17.System.out.println("Exception");
18.} catch (NullPointerException npe) {
19.System.out.println("NullPointerException");
20.}
21.}
What is the result?

• A.  Compilation fails.
• B.  NullPointerException
• C.  test
• D.  Exception

Given:
5.class Building { }
6.public class Barn extends Building {
7.public static void main(String[] args) {
8.Building build1 = new Building();
9.Barn barn1 = new Barn();
10.Barn barn2 = (Barn) build1;
11.Object obj1 = (Object) build1;
12.String str1 = (String) build1;
13.Building build2 = (Building) barn1;
14.}
15.}
Which is true?

• A.  If line 11 is removed, the compilation succeeds.
• B.  More than one line must be removed for compilation to succeed.
• C.  If line 13 is removed, the compilation succeeds.
• D.  If line 12 is removed, the compilation succeeds.
• E.  If line 10 is removed, the compilation succeeds.