QUESTION 1
Given:1. public class Pass2 {
2. public void main(String[] args) {
3. int x = 6;
4. Pass2 p = new Pass2();
5. p.doStuff(x);
6. System.out.print(" main x = " + x);
7. }
8.
9. void doStuff(int x) {
10. System.out.print(" doStuff x = " + x++);
11. }
12. }
And the command-line invocations:
javac Pass2.java
java Pass2 5
What is the result?
A. Compilation fails.
B. An exception is thrown at runtime.
C. doStuff x = 6 main x = 6
D. doStuff x = 6 main x = 7
E. doStuff x = 7 main x = 6
F. doStuff x = 7 main x = 7
Answer: B
Section: All
Explanation/Reference:
Exception in thread "main" java.lang.NoSuchMethodError: main
QUESTION 2
Given:
1. interface DeclareStuff {2. public static final int EASY = 3;
3.
4. void doStuff(int t);
5. }
6.
7. public class TestDeclare implements DeclareStuff {
8. public static void main(String[] args) {
9. int x = 5;
10. new TestDeclare().doStuff(++x);
11. }
12.
13. void doStuff(int s) {
14. s += EASY + ++s;
15. System.out.println("s " + s);
16. }
17. }
What is the result?
A. s 14
B. s 16
C. s 10
D. Compilation fails.
E. An exception is thrown at runtime.
Answer: D
Section: All
Explanation/Reference:
Cannot reduce the visibility of the inherited method from DeclareStuff
QUESTION 3
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 /stuff/java/*.jar
F. put Poker.jar in directory /stuff/java/games/cards, and set the CLASSPATH to include /stuff/java/Poker.jar
Answer: C
Section: All
Explanation/Reference:
QUESTION 4
Given a correctly compiled class whose source code is:1. package com.sun.sjcp;
2.
3. public class Commander {
4. public static void main(String[] args) {
5. // more code here
6. }
7. }
Assume that the class file is located in /foo/com/sun/sjcp/, the current directory is /foo/, and that the
classpath contains "." (current directory). Which command line correctly runs Commander?
A. java Commander
B. java com.sun.sjcp.Commander
C. java com/sun/sjcp/Commander
D. java -cp com.sun.sjcp Commander
E. java -cp com/sun/sjcp Commander
Answer: B
Section: All
Explanation/Reference:
QUESTION 5
Given:interface DoStuff2 {
float getRange(int low, int high);
}
interface DoMore {
float getAvg(int a, int b, int c);
}
abstract class DoAbstract implements DoStuff2, DoMore {
}
class DoStuff implements DoStuff2 {
public float getRange(int x, int y) {
return 3.14f;
}
}
interface DoAll extends DoMore {
float getAvg(int a, int b, int c, int d);
}
What is the result?
A. The file will compile without error.
B. Compilation fails. Only line 7 contains an error.
C. Compilation fails. Only line 12 contains an error.
D. Compilation fails. Only line 13 contains an error.
E. Compilation fails. Only lines 7 and 12 contain errors.
F. Compilation fails. Only lines 7 and 13 contain errors.
G. Compilation fails. Lines 7, 12, and 13 contain errors.
Answer: A
Section: All
Explanation/Reference:
QUESTION 6
Given:public class Spock {
public static void main(String[] args) {
Long tail = 2000L;
Long distance = 1999L;
Long story = 1000L;
if ((tail > distance) ^ ((story * 2) == tail))
System.out.print("1");
if ((distance + 1 != tail) ^ ((story * 2) == distance))
System.out.print("2");
}
}
What is the result?
A. 1
B. 2
C. 12
D. Compilation fails.
E. No output is produced.
F. An exception is thrown at runtime.
Answer: E
Section: All
Explanation/Reference:
QUESTION 7
Given:class Payload {
private int weight;
public Payload() {
}
public Payload(int w) {
weight = w;
}
public void setWeight(int w) {
weight = w;
}
public String toString() {
return Integer.toString(weight);
}
}
public class TestPayload {
static void changePayload(Payload p) {
/* insert code */
}
public static void main(String[] args) {
Payload p = new Payload(200);
p.setWeight(1024);
changePayload(p);
System.out.println("p is " + p);
}
}
Which code fragment, inserted at the end of line 12, produces the output 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);
Answer: A
Section: All
Explanation/Reference:
QUESTION 8
Click the Task button.class A {
String name = "A";
String getName() {
return name;
}
String greeting() {
return "class A";
}
}
class B extends A {
String name = "B";
String greeting() {
return "class B";
}
}
public class Client {
public static void main(String[] args) {
A a = new A();
A b = new B();
System.out.println(a.greeting() + " has name " + a.getName());
System.out.println(b.greeting() + " has name " + b.getName());
}
}
A.
B.
C.
D.
Answer: A
Section: All
Explanation/Reference:
class A has name A
class B has name A
QUESTION 9
Click the Exhibit button.What is the result?
A. Value is: 8
B. Compilation fails.
C. Value is: 12
D. Value is: -12
E. The code runs with no output.
F. An exception is thrown at runtime.
Answer: A
Section: All
Explanation/Reference:
QUESTION 10
Given:class Line {
public class Point {
public int x, y;
}
public Point getPoint() {
return new Point();
}
}
class Triangle {
public Triangle() {
// insert code here
}
}
Which code, inserted at line 16, correctly retrieves a local instance of a Point object?
A. Point p = Line.getPoint();
B. Line.Point p = Line.getPoint();
C. Point p = (new Line()).getPoint();
D. Line.Point p = (new Line()).getPoint();
Answer: D
Section: All
Explanation/Reference:
