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Java Standard Edition 5 Programmer Certified Professional Upgrade Exam
Question No: 61
Click the Exhibit button.
Given the fully-qualified class names:
com.foo.bar.Dog com.foo.bar.blatz.Book com.bar.Car com.bar.blatz.Sun
Which graph represents the correct directory structure for a JAR file from which those classes can be used by the compiler and JVM?
-
Jar C
-
Jar E
-
Jar A
-
Jar D
-
Jar B
Answer: C
Question No: 62
A programmer has an algorithm that requires a java.util.List that provides an efficient implementation of add(0, object), but does NOT need to support quick random access. What supports these requirements?
-
java.util.Queue
-
java.util.ArrayList
-
java.util.LinkedList
-
java.util.LinearList
Answer: C
Question No: 63
Given:
-
public static Iterator reverse(List list) {
-
Collections.reverse(list);
-
return list.iterator();
14. }
-
public static void main(String[] args) {
-
List list = new ArrayList();
-
list.add(quot;1quot;); list.add(quot;2quot;); list.add(quot;3quot;);
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for (Object obj: reverse(list))
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System.out.print(obj quot;, quot;);
20. }
What is the result?
A. 1, 2, 3,
-
The code runs with no output.
-
Compilation fails.
-
An exception is thrown at runtime.
E. 3, 2, 1,
Answer: C
Question No: 64
A programmer needs to create a logging method that can accept an arbitrary number of arguments. For example, it may be called in these ways:
logIt(quot;log message1quot;);
logIt(quot;log message2quot;,quot;log message3quot;);
logIt(quot;log message4quot;,quot;log message5quot;,quot;log message6quot;);
Which declaration satisfies this requirement?
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public void logIt(String… msgs)
-
public void logIt(String * msgs)
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public void logIt(String [] msgs)
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public void logIt(String msg1, String msg2, String msg3)
Answer: A
Question No: 65
Given:
-
abstract class Vehicle { public int speed() { return 0; }}
-
class Car extends Vehicle { public int speed() { return 60; }}
-
class RaceCar extends Car { public int speed() { return 150; }}
…
-
RaceCar racer = new RaceCar();
-
Car car = new RaceCar();
-
Vehicle vehicle = new RaceCar();
-
System.out.println(racer.speed() quot;, quot; car.speed()
25. quot;, quot; vehicle.speed()); What is the result?
A. 150, 150, 150
B. 150, 60, 0
C. An exception is thrown at runtime.
D. 0, 0, 0
E. Compilation fails.
Answer: A
Question No: 66
Given:
-
abstract class A {
-
abstract void a1();
-
void a2() { }
13. }
-
class B extends A {
-
void a1() { }
-
void a2() { }
17. }
18. class C extends B { void c1() { } } and:
A x = new B(); C y = new C(); A z = new C();
What are four valid examples of polymorphic method calls? (Choose four.)
A. x.a2();
B. x.a1();
C. z.a1();
D. z.a2();
E. z.c1();
F. y.c1();
Answer: A,B,C,D
Question No: 67
Given:
-
public class Score implements Comparablelt;Scoregt; {
-
private int wins, losses;
-
public Score(int w, int l) { wins = w; losses = l; }
-
public int getWins() { return wins; }
-
public int getLosses() { return losses; }
-
public String toString() {
-
return quot;lt;quot; wins quot;,quot; losses quot;gt;quot;; 8. }
-
// insert code here
10. }
Which method will complete this class?
-
public int compareTo(Object o){/*more code here*/}
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public int compare(Score s1,Score s2){/*more code here*/}
-
public int compareTo(Score other){/*more code here*/}
-
public int compare(Object o1,Object o2){/*more code here*/}
Answer: C
Question No: 68
A class games.cards.Poker is correctly defined in the jar file Poker.jar. A user wants to execute the main method of Poker on a UNIX system using the command:
java games.cards.Poker
What allows the user to do this?
-
put Poker.jar in directory /stuff/java/games/cards, and set the CLASSPATH to include
/stuff/java/Poker.jar
-
put Poker.jar in directory /stuff/java/games/cards, and set the CLASSPATH to include
/stuff/java
-
Put Poker.jar in directory /stuff/java, and set the CLASSPATH to include
/stuff/java/Poker.jar
-
put Poker.jar in directory /stuff/java, and set the CLASSPATH to include /stuff/java
-
put Poker.jar in directory /stuff/java/games/cards, and set the CLASSPATH to include
/stuff/java/*.jar
-
put Poker.jar in directory /stuff/java, and set the CLASSPATH to include /stuff/java/*.jar
Answer: C
Question No: 69 DRAG DROP
Click the Task button.
Answer:
Question No: 70
Given:
-
-
-
public class Foo {
-
static int[] a;
12. static { a[0]=2; }
13. public static void main( String[] args ) {}
14. }
Which exception or error will be thrown when a programmer attempts to run this code?
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java.lang.IllegalStateException
-
java.lang.ArrayIndexOutOfBoundsException
-
java.lang.StackOverflowError
-
java.lang.ExceptionInInitializerError
Answer: D
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