Question 201
Given:
15. public class Yippee {
16. public static void main(String [] args) {
17. for(int x = 1; x < args.length; x++) {
18. System.out.print(args[x] +“ “);
19. }
20. }
21. }
and two separate command line invocations:
java Yippee
java Yippee 1234
What is the result?
A. No output is produced.
123
B. No output is produced.
234
C. No output is produced.
1234
D. An exception is thrown at runtime.
123
E. An exception is thrown at runtime.
234
F. An exception is thrown at rijntime.
1234
Answer: B
Question 202
Given:
12. public class Yippee2 {
13.
14. static public void main(String [] yahoo) {
15. for(int x= 1; x
16. System.out.print(yahoo[x] + “ “);
17. }
18. }
19. }
and the command line invocation:
java Yippee2 a b c
What is the result?
A.a b
B.b c
C.a b c
D. Compilation fails.
E. An exception is thrown at runtime.
Answer: B
Question 203
Given:
11. public class Commander {
12. public static void main(String[] args) {
13. String myProp = /* insert code here */
14. System.out.println(myProp);
15. }
16. }
and the command line:
java -Dprop.custom=gobstopper Commander
Which two, placed on line 13, will produce the output gobstopper?
(Choose two.)
A. System.load(”prop.custom”);
B. System.getenv(”prop.custom”);
C. System.property(”prop.custom”);
D. System.getProperty(”prop.custom”);
E. System.getProperties().getProperty(”prop.custom”);
Answer: DE
Question 204
Click the Exhibit button.
11. class Payload {
12. private int weight;
13. public Payload(int wt) { weight = wt; }
13. public void setWeight(mt w) { weight = w; }
15. public String toString { return Integer.toString(weight); }
16. }
17.
18. public class TestPayload {
19. static void changePayload(Payload p) {
20. /* insert code here */
21. }
22.
23. public static void main(String[] args) {
24. Payload p = new Payload();
25. p.setWeight(1024);
26. changePayload(p);
27. System.out.println(”The value of p is “+ p);
28. }
29. }
Which statement, placed at line 20, causes the code to print “The value of p is 420.”?
A. p.setWeight(420);
B. p.changePayload(420);
C. p = new Payload(420);
D. Payload.setWeight(420);
E. p = Payload.setWeight(420);
F. p = new Payload();
p.setWeight(420);
Answer: A
Question 205
Click the Exhibit button.
1. public class Item {
2. private String desc;
3. public String getDescription() { return desc; }
4. public void setDescription(String d) { desc = d; }
5.
6. public static void modifyDesc(Item item, String desc) {
7. item = new Item();
8. item.setDescription(desc);
9. }
10. public static void main(String[] args) {
11. Item it = new Item();
12. it.setDescription(”Gobstopper”);
13. Item it2 = new Item();
14. it2.setDescription(”Fizzylifting”);
15. modifyDesc(it, “Scrumdiddlyumptious”);
16. System.out.println(it.getDescription());
17. System.out.println(it2.getDescription());
18. }
19. }
What is the outcome of the code?
A. Compilation fails.
B. Gobstopper
Fizzylifting
C. Gobstopper
Scrumdiddlyumptious
D. Scrumdiddlyumptious
Fizzylifltng
E. Scrumdiddlyumptious
Scrumdiddlyumptious
Answer: B
Question 206
Given:
11. public class ItemTest {
12. private final mt id;
13. public ItemTest(int id) { this.id = id; }
14. public void updateId(int newId) { id = newId; }
15.
16. public static void main(String[] args) {
17. ItemTest fa = new ItemTest(42);
18. fa.updateId(69);
19. System.out.println(fa.id);
20. }
21. }
What is the result?
A. Compilation fails.
B. An exception is thrown at runtime.
C. The attribute id in the Item object remains unchanged.
D. The attribute id in the Item object is modified to the new value.
E. A new Item object is created with the preferred value in the id
attribute.
Answer: A
Question 207
Click the Exhibit button.
10. class Inner {
11. private int x;
12. public void setX( int x) { this.x = x; }
13. public int getX() { return x; }
14. }
15.
16. class Outer {
17. private Inner y;
18. public void setY( Inner y) { this.y = y; }
19. public Inner getY() { return y; }
20. }
21.
22. public class Gamma {
23. public static void main( String[] args) {
24. Outer o = new Outer();
25. Inner i = new Inner();
26.int n=10;
27. i.setX(n);
28. o.setY(i);
29. // insert code here
30. System.out.println( o.getY().getX());
31. }
32. }
Which three code fragments, added individually at line 29, produce the output 100? (Choose three.)
A. n = 100;
B. i.setX( 100);
C. o.getY().setX( 100);
D. i = new Inner(); i.setX( 100);
E. o.setY( i); i = new Inner(); i.setX( 100);
F. i = new Inner(); i.setX( 100); o.setY( i);
Answer: BCF
Question 208
Click the Exhibit button.
10. class Foo {
11. private int x;
12.publicFoo(intx) {this.x=x; }
13. public void setX( int x) { this.x = x; }
14. public int getX() { return x; }
15. }
16.
17. public class Gamma {
18.
19. static Foo fooBar( Foo foo) {
20. foo = new Foo( 100);
21. return foo;
22. }
23.
24. public static void main( String[] args) {
25. Foo foo = new Foo( 300);
26. System.out.print( foo.getX() + “-“);
27.
28. Foo fooFoo = fooBar( foo);
29. System.out.print( foo.getX() + “-“);
30. System.out.print( fooFoo.getX() + “-“);
31.
32. foo = fooBar( fooFoo);
33. System.out.print( foo.getX() + “-“);
34. System.out.prmt( fooFoo.getX());
35. }
36. }
What is the output of this program?
A. 300-100-100-100-100
B. 300-300-100-100-100
C. 300-300-300-100-100
D. 300-300-300-300-100
Answer: B
Question 209
Given:
11. public void genNumbers() {
12. ArrayList numbers = new ArrayList();
13. for (int i=0; i<10; i++) {
14. int value = i * ((int) Math.random());
15. Integer intObj = new Integer(value);
16. numbers.add(intObj);
17. }
18. System.out.println(numbers);
19. }
Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection?
A. Line 16
B. Line 17
C. Line 18
D. Line 19
E. The object is NOT a candidate for garbage collection.
Answer: D
Question 210
Given:
11. rbo = new ReallyBigObject();
12. // more code here
13. rbo = null;
14. /* insert code here */
Which statement should be placed at line 14 to suggest that the virtual
machine expend effort toward recycling the memory used by the
object rbo?
A. System.gc();
B. Runtime.gc();
C. System.freeMemory();
D. Runtime.getRuntime().growHeap();
E. Runtime.getRuntime().freeMemory();
Answer: A
Question 211
Given:
11. class Snoochy {
12. Boochybooch;
13. public Snoochy() { booch = new Boochy(this); }
14. }
15.
16. class Boochy {
17. Snoochy snooch;
18. public Boochy(Snoochy s) { snooch = s; }
19. }
And the statements:
21. public static void main(String[] args) {
22. Snoochy snoog = new Snoochy();
23. snoog = null;
24. // more code here
25. }
Which statement is true about the objects referenced by snoog, snooch, and booch immediately after line 23 executes?
A. None of these objects are eligible for garbage collection.
B. Only the object referenced by booch is eligible for garbage
collection.
C. Only the object referenced by snoog is eligible for garbage
collection.
D. Only the object referenced by snooch is eligible for garbage
collection.
E. The objects referenced by snooch and booch are eligible for garbage
collection.
Answer: E
Question 212
Given:
1. public class GC {
2. private Object o;
3. private void doSomethingElse(Object obj) { o = obj; }
4. public void doSomething() {
5. Object o = new Object();
6. doSomethingElse(o);
7. o = new Object();
8. doSomethingElse(null);
9.o=null;
10. }
11. }
When the doSomething method is called, after which line does the Object created in line 5 become available for garbage collection?
A. Line 5
B. Line 6
C. Line 7
D. Line 8
E. Line 9
F. Line 10
Answer: D
Question 213
Which two are true? (Choose two.)
A. A finalizer may NOT be invoked explicitly.
B. The finalize method declared in class Object takes no action.
C. super.finalize() is called implicitly by any overriding finalize method.
D. The finalize method for a given object will be called no more than
once by the garbage collector.
E. The order in which finalize will be called on two objects is based on
the order in which the two objects became finalizable.
Answer: BD
Question 214
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?
A. put Poker.jar in directory /stuff/java, and set the CLASSPATH to
include /stuff/java
B. put Poker.jar in directory /stuff/java, and set the CLASSPATH to
include /stuff/java/*.jar
C. Put Poker.jar in directory /stuff/java, and set the CLASSPATH to
include /stuff/java/Poker.jar
D. put Poker.jar in directory /stuff/java/games/cards, and set the
CLASSPATH to include /stuff/java
E. put Poker.jar in directory /stuff/java/games/cards, and set the
CLASSPATH to include /stuffijava/*.jar
F. put Poker.jar in directory /stuff/java/games/cards, and set the
CLASSPATH to include /stuff/java/Poker.jar
Answer: C
Question 215
Click the Exhibit button.
Given the fully-qualified class names:
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 JYM?
A. Jar A
B. Jar B
C. Jar C
D. Jar D
E. Jar E
Answer: A
Question 216
A developer is creating a class Book that needs to access class Paper.
The Paper class is deployed in a JAR named myLib.jar. Which three,taken independently, will allow the developer to use the Paper class while compiling the Book class? (Choose three.)
A. The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.
B. The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar.
C. The JAR file is located at /foo/myLib.jar and a classpath
environment variable is set that includes /foo/myLib.jar/Paper.class.
D. The JAR file is located at /foo/myLib.jar and a classpath
environment variable is set that includes /foo/myLib.jar.
E. The JAR file is located at /foo/myLib.jar and the Book class is
compiled using javac -cp /foo/myLib.jar/Paper Book.java.
F. The JAR file is located at /foo/myLib.jar and the Book class is
compiled using javac -d /foo/myLib.jar Book.java.
G. The JAR file is located at /foo/myLib.jar and the Book class is
compiled using javac -classpath /foo/myLib.jar Book.java.
Answer: BDG
Question 217
Given:
1. package com.company.application;
2.
3. public class MainClass {
4. public static void main(String[] args) { }
5. }
And MainClass exists in the /apps/com/company/application directory.
Assume the CLASSPATH environment variable is set to “.“ (current
directory).
Which two java commands entered at the command line will run MainClass? (Choose two.)
Which two java commands entered at the command line will run MainClass? (Choose two.)
A. java MainClass if run from the /apps directory
B. java com.company.application.MainClass if run from the /apps
directory
C. java -classpath /apps com.company.application.MainClass if run
from any directory
D. java -classpath . MainClass if run from the
/apps/com/company/application directory
E. java -classpath /apps/com/company/application:. MainClass if run
from the /apps directory
F. java com.company.application.MainClass if run from the
/apps/com/company/application directory
Answer: BC
Question 218
A UNIX user named Bob wants to replace his chess program with a
new one, but he is hot sure where the old one is installed. Bob is
currently able to run a Java chess program starting from his home
directory /home/bob using the command:
java -classpath /test:/home/bob/downloads/* .jar games.Chess
Bob’s CLASSPATH is set (at login time) to:
/usr/lib:/home/bob/classes:/opt/java/lib:/opt/java/lib/* .jar
What is a possible location for the Chess.class file?
A. /test/Chess.class
B. /home/bob/Chess.class
C. /test/games/Chess.class
D. /usr/lib/games/Chess.class
E. /home/bob/games/Chess.class
F. inside jarfile /opt/java/lib/Games.jar (with a correct manifest)
G. inside jarfile /home/bob/downloads/Games.jar (with a correct
manifest)
Answer: C
Question 219
Given:
11. public static void test(String str) {
12. if(str == null | str.lellgth() == 0) {
13. System.out.println(”String is empty”);
14. } else {
15. System.out.println(”String is not empty”);
16. }
17. }
And the invocation:
31. test(llull);
What is the result?
A. Au exception is thrown at runtime.
B. “String is empty” is printed to output.
C. Compilation fails because of au error in line 12.
D. “String is not empty” is printed to output.
Answer: A
Question 220
Given:
11. public static void test(String str) {
12. int check = 4;
13. if (check = str.length()) {
14. System.out.print(str.charAt(check -= 1) +“, “);
15. } else {
16. System.out.print(str.charAt(0) + “, “);
17. }
18. }
and the invocation:
21. test(”four”);
22. test(”tee”);
23. test(”to”);
What is the result?
A. r, t, t,
B. r, e, o,
C. Compilation fails.
D. An exception is thrown at runtime.
Answer: C
Question 221
Given:
10. public class MyClass {
11.
12. public Integer startingI;
13. public void methodA() {
14. Integer i = new Integer(25);
15. startingI = i;
16. methodB(i);
17. }
18. private void methodB(Integer i2) {
19. i2 = i2.intValue();
20.
21. }
22. }
If methodA is invoked, which two are true at line 20? (Choose two.)
A. i2 == startingI returns true.
B. i2 == startingI returns false.
C. i2.equals(startingI) returns true.
D. i2.equals(startingI) returns false.
Answer: BC
Question 222
222. Given:
11. class Cup { }
12. class PoisonCup extends Cup { }
21. public void takeCup(Cup c) {
22. if(c instanceof PoisonCup) {
23. System.out.println(”Inconceivable!”);
24. } else if(c instanceof Cup) {
25. System.out.println(”Dizzying intellect!”);
26. } else {
27. System.exit(0);
28. }
29. }
And the execution of the statements:
Cup cup = new PoisonCup();
takeCup(cup);
What is the output?
A. Inconceivable!
B. Dizzying intellect!
C. The code runs with no output.
D. An exception is thrown at runtime.
E. Compilation fails because of an error in line 22.
Answer: A
Question 223
Given:
11. String[] elements = { “for”, “tea”, “too” };
12. String first = (elements.length > 0)? elements[0] null;
What is the result?
A. Compilation fails.
B. An exception is thrown at runtime.
C. The variable first is set to null.
D. The variable first is set to elements[0].
Answer: D
Question 224
Given:
42. public class ClassA {
43. public int getValue() {
44.int value=0;
45. boolean setting = true;
46. String title=”Hello”;
47. if (value || (setting && title == “Hello”)) { return 1; }
48. if (value == 1 & title.equals(”Hello”)) { return 2; }
49. }
50. }
And:
70. ClassA a = new ClassA();
71. a.getValue();
What is the result?
A. 1
B. 2
C. Compilation fails.
D. The code runs with no output.
E. An exception is thrown at runtime.
Answer: C
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